sp_BlitzIndex.sql

SET ANSI_NULLS ON;
SET ANSI_PADDING ON;
SET ANSI_WARNINGS ON;
SET ARITHABORT ON;
SET CONCAT_NULL_YIELDS_NULL ON;
SET QUOTED_IDENTIFIER ON;
SET STATISTICS IO OFF;
SET STATISTICS TIME OFF;
GO

IF OBJECT_ID('dbo.sp_BlitzIndex') IS NULL
  EXEC ('CREATE PROCEDURE dbo.sp_BlitzIndex AS RETURN 0;');
GO

ALTER PROCEDURE dbo.sp_BlitzIndex
    @ObjectName NVARCHAR(386) = NULL, /* 'dbname.schema.table' -- if you are lazy and want to fill in @DatabaseName, @SchemaName and @TableName, and since it's the first parameter can simply do: sp_BlitzIndex 'sch.table' */
    @DatabaseName NVARCHAR(128) = NULL, /*Defaults to current DB if not specified*/
    @SchemaName NVARCHAR(128) = NULL, /*Requires table_name as well.*/
    @TableName NVARCHAR(128) = NULL,  /*Requires schema_name as well.*/
    @Mode TINYINT=0, /*0=Diagnose, 1=Summarize, 2=Index Usage Detail, 3=Missing Index Detail, 4=Diagnose Details*/
        /*Note:@Mode doesn't matter if you're specifying schema_name and @TableName.*/
    @Filter TINYINT = 0, /* 0=no filter (default). 1=No low-usage warnings for objects with 0 reads. 2=Only warn for objects >= 500MB */
        /*Note:@Filter doesn't do anything unless @Mode=0*/
    @SkipPartitions BIT	= 0,
    @SkipStatistics BIT	= 1,
    @UsualStatisticsSamplingPercent FLOAT = 100, /* FLOAT to match sys.dm_db_stats_properties. More detail later. 100 by default because Brent suggests that if people are persisting statistics at all, they are probably doing 100 in lots of places and not filtering that out would produce noise. */
    @GetAllDatabases BIT = 0,
	@ShowColumnstoreOnly BIT = 0, /* Will show only the Row Group and Segment details for a table with a columnstore index. */
    @BringThePain BIT = 0,
    @IgnoreDatabases NVARCHAR(MAX) = NULL, /* Comma-delimited list of databases you want to skip */
    @ThresholdMB INT = 250 /* Number of megabytes that an object must be before we include it in basic results */,
	@OutputType VARCHAR(20) = 'TABLE' ,
    @OutputServerName NVARCHAR(256) = NULL ,
    @OutputDatabaseName NVARCHAR(256) = NULL ,
    @OutputSchemaName NVARCHAR(256) = NULL ,
    @OutputTableName NVARCHAR(256) = NULL ,
	@IncludeInactiveIndexes BIT = 0 /* Will skip indexes with no reads or writes */,
    @ShowAllMissingIndexRequests BIT = 0 /*Will make all missing index requests show up*/,
	@ShowPartitionRanges BIT = 0 /* Will add partition range values column to columnstore visualization */,
	@SortOrder NVARCHAR(50) = NULL, /* Only affects @Mode = 2. */
	@SortDirection NVARCHAR(4) = 'DESC', /* Only affects @Mode = 2. */
    @Help TINYINT = 0,
	@Debug BIT = 0,
    @Version     VARCHAR(30) = NULL OUTPUT,
	@VersionDate DATETIME = NULL OUTPUT,
    @VersionCheckMode BIT = 0
WITH RECOMPILE
AS
SET NOCOUNT ON;
SET STATISTICS XML OFF;
SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED;

SELECT @Version = '8.25', @VersionDate = '20250704';
SET @OutputType  = UPPER(@OutputType);

IF(@VersionCheckMode = 1)
BEGIN
	RETURN;
END;

IF @Help = 1 
BEGIN
PRINT '
/*
sp_BlitzIndex from http://FirstResponderKit.org
	
This script analyzes the design and performance of your indexes.

To learn more, visit http://FirstResponderKit.org where you can download new
versions for free, watch training videos on how it works, get more info on
the findings, contribute your own code, and more.

Known limitations of this version:
 - Only Microsoft-supported versions of SQL Server. Sorry, 2005 and 2000.
 - Index create statements are just to give you a rough idea of the syntax. It includes filters and fillfactor.
 --        Example 1: index creates use ONLINE=? instead of ONLINE=ON / ONLINE=OFF. This is because it is important 
           for the user to understand if it is going to be offline and not just run a script.
 --        Example 2: they do not include all the options the index may have been created with (padding, compression
           filegroup/partition scheme etc.)
 --        (The compression and filegroup index create syntax is not trivial because it is set at the partition 
           level and is not trivial to code.)
 - Does not advise you about data modeling for clustered indexes and primary keys (primarily looks for signs of problems.)

Unknown limitations of this version:
 - We knew them once, but we forgot.


MIT License

Copyright (c) Brent Ozar Unlimited

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
';
RETURN;
END;    /* @Help = 1 */

DECLARE @ScriptVersionName NVARCHAR(50);
DECLARE @DaysUptime NUMERIC(23,2);
DECLARE @DatabaseID INT;
DECLARE @ObjectID INT;
DECLARE @dsql NVARCHAR(MAX);
DECLARE @params NVARCHAR(MAX);
DECLARE @msg NVARCHAR(4000);
DECLARE @ErrorSeverity INT;
DECLARE @ErrorState INT;
DECLARE @Rowcount BIGINT;
DECLARE @SQLServerProductVersion NVARCHAR(128);
DECLARE @SQLServerEdition INT;
DECLARE @FilterMB INT;
DECLARE @collation NVARCHAR(256);
DECLARE @NumDatabases INT;
DECLARE @LineFeed NVARCHAR(5);
DECLARE @DaysUptimeInsertValue NVARCHAR(256);
DECLARE @DatabaseToIgnore NVARCHAR(MAX);
DECLARE @ColumnList NVARCHAR(MAX);
DECLARE @ColumnListWithApostrophes NVARCHAR(MAX);
DECLARE @PartitionCount INT;
DECLARE @OptimizeForSequentialKey BIT = 0;
DECLARE @ResumableIndexesDisappearAfter INT = 0;
DECLARE @StringToExecute NVARCHAR(MAX);

/* If user was lazy and just used @ObjectName with a fully qualified table name, then lets parse out the various parts */
SET @DatabaseName = COALESCE(@DatabaseName, PARSENAME(@ObjectName, 3)) /* 3 = Database name */
SET @SchemaName   = COALESCE(@SchemaName,   PARSENAME(@ObjectName, 2)) /* 2 = Schema name */
SET @TableName    = COALESCE(@TableName,    PARSENAME(@ObjectName, 1)) /* 1 = Table name */


/* Let's get @SortOrder set to lower case here for comparisons later */
SET @SortOrder = REPLACE(LOWER(@SortOrder), N' ', N'_');
SET @SortDirection = LOWER(@SortDirection);

SET @LineFeed = CHAR(13) + CHAR(10);
SELECT @SQLServerProductVersion = CAST(SERVERPROPERTY('ProductVersion') AS NVARCHAR(128));
SELECT @SQLServerEdition =CAST(SERVERPROPERTY('EngineEdition') AS INT); /* We default to online index creates where EngineEdition=3*/
SET @FilterMB=250;
SELECT @ScriptVersionName = 'sp_BlitzIndex(TM) v' + @Version + ' - ' + DATENAME(MM, @VersionDate) + ' ' + RIGHT('0'+DATENAME(DD, @VersionDate),2) + ', ' + DATENAME(YY, @VersionDate);
SET @IgnoreDatabases = REPLACE(REPLACE(LTRIM(RTRIM(@IgnoreDatabases)), CHAR(10), ''), CHAR(13), '');

SELECT
    @OptimizeForSequentialKey =
	    CASE WHEN EXISTS
		          (
                      SELECT
                          1/0
                      FROM sys.all_columns AS ac
                      WHERE ac.object_id = OBJECT_ID('sys.indexes')
                      AND   ac.name = N'optimize_for_sequential_key'
				  )
			THEN 1
			ELSE 0
		END;

RAISERROR(N'Starting run. %s', 0,1, @ScriptVersionName) WITH NOWAIT;

																				
IF(@OutputType NOT IN ('TABLE','NONE'))
BEGIN
    RAISERROR('Invalid value for parameter @OutputType. Expected: (TABLE;NONE)',12,1);
    RETURN;
END;

IF(@UsualStatisticsSamplingPercent <= 0 OR @UsualStatisticsSamplingPercent > 100)
BEGIN
    RAISERROR('Invalid value for parameter @UsualStatisticsSamplingPercent. Expected: 1 to 100',12,1);
    RETURN;
END;

IF(@OutputType = 'TABLE' AND NOT (@OutputTableName IS NULL AND @OutputSchemaName IS NULL AND @OutputDatabaseName IS NULL AND @OutputServerName IS NULL))
BEGIN
	RAISERROR(N'One or more output parameters specified in combination with TABLE output, changing to NONE output mode', 0,1) WITH NOWAIT;
	SET @OutputType = 'NONE'
END;
                       
IF(@OutputType = 'NONE')
BEGIN

	IF ((@OutputServerName IS NOT NULL) AND (@OutputTableName IS NULL OR @OutputSchemaName IS NULL OR @OutputDatabaseName IS NULL))
	BEGIN
        RAISERROR('Parameter @OutputServerName is specified, rest of @Output* parameters needs to also be specified',12,1);
        RETURN;
	END;

    IF(@OutputTableName IS NULL OR @OutputSchemaName IS NULL OR @OutputDatabaseName IS NULL)
    BEGIN
        RAISERROR('This procedure should be called with a value for @OutputTableName, @OutputSchemaName and @OutputDatabaseName parameters, as @OutputType is set to NONE',12,1);
        RETURN;
    END;
	/* Output is supported for all modes, no reason to not bring pain and output
    IF(@BringThePain = 1)
    BEGIN
        RAISERROR('Incompatible Parameters: @BringThePain set to 1 and @OutputType set to NONE',12,1);
        RETURN;
    END;
	*/
	/* Eventually limit by mode																			   
    IF(@Mode not in (0,4)) 
	BEGIN
        RAISERROR('Incompatible Parameters: @Mode set to %d and @OutputType set to NONE',12,1,@Mode);
        RETURN;
	END;
	*/
END;

IF OBJECT_ID('tempdb..#IndexSanity') IS NOT NULL 
    DROP TABLE #IndexSanity;

IF OBJECT_ID('tempdb..#IndexPartitionSanity') IS NOT NULL 
    DROP TABLE #IndexPartitionSanity;

IF OBJECT_ID('tempdb..#IndexSanitySize') IS NOT NULL 
    DROP TABLE #IndexSanitySize;

IF OBJECT_ID('tempdb..#IndexColumns') IS NOT NULL 
    DROP TABLE #IndexColumns;

IF OBJECT_ID('tempdb..#MissingIndexes') IS NOT NULL 
    DROP TABLE #MissingIndexes;

IF OBJECT_ID('tempdb..#ForeignKeys') IS NOT NULL 
    DROP TABLE #ForeignKeys;

IF OBJECT_ID('tempdb..#UnindexedForeignKeys') IS NOT NULL 
    DROP TABLE #UnindexedForeignKeys;

IF OBJECT_ID('tempdb..#BlitzIndexResults') IS NOT NULL 
    DROP TABLE #BlitzIndexResults;
        
IF OBJECT_ID('tempdb..#IndexCreateTsql') IS NOT NULL    
    DROP TABLE #IndexCreateTsql;

IF OBJECT_ID('tempdb..#DatabaseList') IS NOT NULL 
    DROP TABLE #DatabaseList;

IF OBJECT_ID('tempdb..#Statistics') IS NOT NULL 
    DROP TABLE #Statistics;

IF OBJECT_ID('tempdb..#PartitionCompressionInfo') IS NOT NULL 
    DROP TABLE #PartitionCompressionInfo;

IF OBJECT_ID('tempdb..#ComputedColumns') IS NOT NULL 
    DROP TABLE #ComputedColumns;
	
IF OBJECT_ID('tempdb..#TraceStatus') IS NOT NULL
	DROP TABLE #TraceStatus;

IF OBJECT_ID('tempdb..#TemporalTables') IS NOT NULL
	DROP TABLE #TemporalTables;

IF OBJECT_ID('tempdb..#CheckConstraints') IS NOT NULL
	DROP TABLE #CheckConstraints;

IF OBJECT_ID('tempdb..#FilteredIndexes') IS NOT NULL
	DROP TABLE #FilteredIndexes;

IF OBJECT_ID('tempdb..#Ignore_Databases') IS NOT NULL 
    DROP TABLE #Ignore_Databases;

IF OBJECT_ID('tempdb..#IndexResumableOperations') IS NOT NULL 
    DROP TABLE #IndexResumableOperations;

IF OBJECT_ID('tempdb..#dm_db_partition_stats_etc') IS NOT NULL 
    DROP TABLE #dm_db_partition_stats_etc
IF OBJECT_ID('tempdb..#dm_db_index_operational_stats') IS NOT NULL 
    DROP TABLE #dm_db_index_operational_stats

        RAISERROR (N'Create temp tables.',0,1) WITH NOWAIT;
        CREATE TABLE #BlitzIndexResults
            (
              blitz_result_id INT IDENTITY PRIMARY KEY,
              check_id INT NOT NULL,
              index_sanity_id INT NULL,
              Priority INT NULL,
              findings_group NVARCHAR(4000) NOT NULL,
              finding NVARCHAR(200) NOT NULL,
              [database_name] NVARCHAR(128) NULL,
              URL NVARCHAR(200) NOT NULL,
              details NVARCHAR(MAX) NOT NULL,
              index_definition NVARCHAR(MAX) NOT NULL,
              secret_columns NVARCHAR(MAX) NULL,
              index_usage_summary NVARCHAR(MAX) NULL,
              index_size_summary NVARCHAR(MAX) NULL,
              create_tsql NVARCHAR(MAX) NULL,
              more_info NVARCHAR(MAX) NULL,
              sample_query_plan XML NULL
            );

        CREATE TABLE #IndexSanity
            (
              [index_sanity_id] INT IDENTITY PRIMARY KEY CLUSTERED,
              [database_id] SMALLINT NOT NULL ,
              [object_id] INT NOT NULL ,
              [index_id] INT NOT NULL ,
              [index_type] TINYINT NOT NULL,
              [database_name] NVARCHAR(128) NOT NULL ,
              [schema_name] NVARCHAR(128) NOT NULL ,
              [object_name] NVARCHAR(128) NOT NULL ,
              index_name NVARCHAR(128) NULL ,
              key_column_names NVARCHAR(MAX) NULL ,
              key_column_names_with_sort_order NVARCHAR(MAX) NULL ,
              key_column_names_with_sort_order_no_types NVARCHAR(MAX) NULL ,
              count_key_columns INT NULL ,
              include_column_names NVARCHAR(MAX) NULL ,
              include_column_names_no_types NVARCHAR(MAX) NULL ,
              count_included_columns INT NULL ,
              partition_key_column_name NVARCHAR(MAX) NULL,
              filter_definition NVARCHAR(MAX) NOT NULL ,
			  optimize_for_sequential_key BIT NULL,
			  is_indexed_view BIT NOT NULL ,
              is_unique BIT NOT NULL ,
              is_primary_key BIT NOT NULL ,
			  is_unique_constraint BIT NOT NULL ,
			  is_XML bit NOT NULL,
              is_spatial BIT NOT NULL,
              is_NC_columnstore BIT NOT NULL,
              is_CX_columnstore BIT NOT NULL,
              is_in_memory_oltp BIT NOT NULL ,
              is_disabled BIT NOT NULL ,
              is_hypothetical BIT NOT NULL ,
              is_padded BIT NOT NULL ,
              fill_factor SMALLINT NOT NULL ,
              user_seeks BIGINT NOT NULL ,
              user_scans BIGINT NOT NULL ,
              user_lookups BIGINT NOT  NULL ,
              user_updates BIGINT NULL ,
              last_user_seek DATETIME NULL ,
              last_user_scan DATETIME NULL ,
              last_user_lookup DATETIME NULL ,
              last_user_update DATETIME NULL ,
              is_referenced_by_foreign_key BIT DEFAULT(0),
              secret_columns NVARCHAR(MAX) NULL,
              count_secret_columns INT NULL,
              create_date DATETIME NOT NULL,
              modify_date DATETIME NOT NULL,
              filter_columns_not_in_index NVARCHAR(MAX),
            [db_schema_object_name] AS [schema_name] + N'.' + [object_name]  ,
            [db_schema_object_indexid] AS [schema_name] + N'.' + [object_name]
                + CASE WHEN [index_name] IS NOT NULL THEN N'.' + index_name
                ELSE N''
                END + N' (' + CAST(index_id AS NVARCHAR(20)) + N')' ,
            first_key_column_name AS CASE    WHEN count_key_columns > 1
                THEN LEFT(key_column_names, CHARINDEX(',', key_column_names, 0) - 1)
                ELSE key_column_names
                END ,
            index_definition AS 
            CASE WHEN partition_key_column_name IS NOT NULL 
                THEN N'[PARTITIONED BY:' + partition_key_column_name +  N']' 
                ELSE '' 
                END +
                CASE index_id
                    WHEN 0 THEN N'[HEAP] '
                    WHEN 1 THEN N'[CX] '
                    ELSE N'' END + CASE WHEN is_indexed_view = 1 THEN N'[VIEW] '
                    ELSE N'' END + CASE WHEN is_primary_key = 1 THEN N'[PK] '
                    ELSE N'' END + CASE WHEN is_XML = 1 THEN N'[XML] '
                    ELSE N'' END + CASE WHEN is_spatial = 1 THEN N'[SPATIAL] '
                    ELSE N'' END + CASE WHEN is_NC_columnstore = 1 THEN N'[COLUMNSTORE] '
                    ELSE N'' END + CASE WHEN is_in_memory_oltp = 1 THEN N'[IN-MEMORY] '
                    ELSE N'' END + CASE WHEN is_disabled = 1 THEN N'[DISABLED] '
                    ELSE N'' END + CASE WHEN is_hypothetical = 1 THEN N'[HYPOTHETICAL] '
                    ELSE N'' END + CASE WHEN is_unique = 1 AND is_primary_key = 0 AND is_unique_constraint = 0 THEN N'[UNIQUE] '
					ELSE N'' END + CASE WHEN is_unique_constraint = 1 AND is_primary_key = 0 THEN N'[UNIQUE CONSTRAINT] '
                    ELSE N'' END + CASE WHEN count_key_columns > 0 THEN 
                        N'[' + CAST(count_key_columns AS NVARCHAR(10)) + N' KEY' 
                            + CASE WHEN count_key_columns > 1 THEN  N'S' ELSE N'' END
                            + N'] ' + LTRIM(key_column_names_with_sort_order)
                    ELSE N'' END + CASE WHEN count_included_columns > 0 THEN 
                        N' [' + CAST(count_included_columns AS NVARCHAR(10))  + N' INCLUDE' + 
                            + CASE WHEN count_included_columns > 1 THEN  N'S' ELSE N'' END                    
                            + N'] ' + include_column_names
                    ELSE N'' END + CASE WHEN filter_definition <> N'' THEN N' [FILTER] ' + filter_definition
                    ELSE N'' END ,
            [total_reads] AS user_seeks + user_scans + user_lookups,
            [reads_per_write] AS CAST(CASE WHEN user_updates > 0
                THEN ( user_seeks + user_scans + user_lookups )  / (1.0 * user_updates)
                ELSE 0 END AS MONEY) ,
            [index_usage_summary] AS
				CASE WHEN is_spatial = 1 THEN N'Not Tracked'
				WHEN is_disabled = 1 THEN N'Disabled'
				ELSE N'Reads: ' + 
					REPLACE(CONVERT(NVARCHAR(30),CAST((user_seeks + user_scans + user_lookups) AS MONEY), 1), N'.00', N'')
					+ CASE WHEN user_seeks + user_scans + user_lookups > 0 THEN
						N' (' 
							+ RTRIM(
							CASE WHEN user_seeks > 0 THEN REPLACE(CONVERT(NVARCHAR(30),CAST((user_seeks) AS MONEY), 1), N'.00', N'') + N' seek ' ELSE N'' END
							+ CASE WHEN user_scans > 0 THEN REPLACE(CONVERT(NVARCHAR(30),CAST((user_scans) AS MONEY), 1), N'.00', N'') + N' scan '  ELSE N'' END
							+ CASE WHEN user_lookups > 0 THEN  REPLACE(CONVERT(NVARCHAR(30),CAST((user_lookups) AS MONEY), 1), N'.00', N'') + N' lookup' ELSE N'' END
							)
							+ N') '
						ELSE N' '
						END 
					+ N'Writes: ' + 
					REPLACE(CONVERT(NVARCHAR(30),CAST(user_updates AS MONEY), 1), N'.00', N'')
				END /* First "end" is about is_spatial */,
				[more_info] AS 
				CASE WHEN is_in_memory_oltp = 1 
					THEN N'EXEC dbo.sp_BlitzInMemoryOLTP @dbName=' + QUOTENAME([database_name],N'''') + 
					N', @tableName=' + QUOTENAME([object_name],N'''') + N';'
				ELSE N'EXEC dbo.sp_BlitzIndex @DatabaseName=' + QUOTENAME([database_name],N'''') + 
					N', @SchemaName=' + QUOTENAME([schema_name],N'''') + N', @TableName=' + QUOTENAME([object_name],N'''') + N';'
				END
		);
        RAISERROR (N'Adding UQ index on #IndexSanity (database_id, object_id, index_id)',0,1) WITH NOWAIT;
        IF NOT EXISTS(SELECT 1 FROM tempdb.sys.indexes WHERE name='uq_database_id_object_id_index_id') 
            CREATE UNIQUE INDEX uq_database_id_object_id_index_id ON #IndexSanity (database_id, object_id, index_id);


        CREATE TABLE #IndexPartitionSanity
            (
              [index_partition_sanity_id] INT IDENTITY,
              [index_sanity_id] INT NULL ,
              [database_id] INT NOT NULL ,
              [object_id] INT NOT NULL ,
			  [schema_name] NVARCHAR(128) NOT NULL,
              [index_id] INT NOT NULL ,
              [partition_number] INT NOT NULL ,
              row_count BIGINT NOT NULL ,
              reserved_MB NUMERIC(29,2) NOT NULL ,
              reserved_LOB_MB NUMERIC(29,2) NOT NULL ,
              reserved_row_overflow_MB NUMERIC(29,2) NOT NULL ,
              reserved_dictionary_MB NUMERIC(29,2) NOT NULL ,
              leaf_insert_count BIGINT NULL ,
              leaf_delete_count BIGINT NULL ,
              leaf_update_count BIGINT NULL ,
              range_scan_count BIGINT NULL ,
              singleton_lookup_count BIGINT NULL , 
              forwarded_fetch_count BIGINT NULL ,
              lob_fetch_in_pages BIGINT NULL ,
              lob_fetch_in_bytes BIGINT NULL ,
              row_overflow_fetch_in_pages BIGINT NULL ,
              row_overflow_fetch_in_bytes BIGINT NULL ,
              row_lock_count BIGINT NULL ,
              row_lock_wait_count BIGINT NULL ,
              row_lock_wait_in_ms BIGINT NULL ,
              page_lock_count BIGINT NULL ,
              page_lock_wait_count BIGINT NULL ,
              page_lock_wait_in_ms BIGINT NULL ,
              index_lock_promotion_attempt_count BIGINT NULL ,
              index_lock_promotion_count BIGINT NULL,
              data_compression_desc NVARCHAR(60) NULL,
			  page_latch_wait_count BIGINT NULL,
			  page_latch_wait_in_ms BIGINT NULL,
			  page_io_latch_wait_count BIGINT NULL,
			  page_io_latch_wait_in_ms BIGINT NULL,
              lock_escalation_desc nvarchar(60) NULL
            );

        CREATE TABLE #IndexSanitySize
            (
              [index_sanity_size_id] INT IDENTITY NOT NULL ,
              [index_sanity_id] INT NULL ,
              [database_id] INT NOT NULL,
			  [schema_name] NVARCHAR(128) NOT NULL,
              partition_count INT NOT NULL ,
              total_rows BIGINT NOT NULL ,
              total_reserved_MB NUMERIC(29,2) NOT NULL ,
              total_reserved_LOB_MB NUMERIC(29,2) NOT NULL ,
              total_reserved_row_overflow_MB NUMERIC(29,2) NOT NULL ,
              total_reserved_dictionary_MB NUMERIC(29,2) NOT NULL ,
              total_leaf_delete_count BIGINT NULL,
              total_leaf_update_count BIGINT NULL,
              total_range_scan_count BIGINT NULL,
              total_singleton_lookup_count BIGINT NULL,
              total_forwarded_fetch_count BIGINT NULL,
              total_row_lock_count BIGINT NULL ,
              total_row_lock_wait_count BIGINT NULL ,
              total_row_lock_wait_in_ms BIGINT NULL ,
              avg_row_lock_wait_in_ms BIGINT NULL ,
              total_page_lock_count BIGINT NULL ,
              total_page_lock_wait_count BIGINT NULL ,
              total_page_lock_wait_in_ms BIGINT NULL ,
              avg_page_lock_wait_in_ms BIGINT NULL ,
               total_index_lock_promotion_attempt_count BIGINT NULL ,
              total_index_lock_promotion_count BIGINT NULL ,
              data_compression_desc NVARCHAR(4000) NULL,
			  page_latch_wait_count BIGINT NULL,
			  page_latch_wait_in_ms BIGINT NULL,
			  page_io_latch_wait_count BIGINT NULL,
			  page_io_latch_wait_in_ms BIGINT NULL,
              lock_escalation_desc nvarchar(60) NULL,
              index_size_summary AS ISNULL(
                CASE WHEN partition_count > 1
                        THEN N'[' + CAST(partition_count AS NVARCHAR(10)) + N' PARTITIONS] '
                        ELSE N''
                END + REPLACE(CONVERT(NVARCHAR(30),CAST([total_rows] AS MONEY), 1), N'.00', N'') + N' rows; '
                + CASE WHEN total_reserved_MB > 1024 THEN 
                    CAST(CAST(total_reserved_MB/1024. AS NUMERIC(29,1)) AS NVARCHAR(30)) + N'GB'
                ELSE 
                    CAST(CAST(total_reserved_MB AS NUMERIC(29,1)) AS NVARCHAR(30)) + N'MB'
                END
                + CASE WHEN total_reserved_LOB_MB > 1024 THEN 
                    N'; ' + CAST(CAST(total_reserved_LOB_MB/1024. AS NUMERIC(29,1)) AS NVARCHAR(30)) + N'GB ' + CASE WHEN total_reserved_dictionary_MB = 0 THEN N'LOB' ELSE N'Columnstore' END
                WHEN total_reserved_LOB_MB > 0 THEN
                    N'; ' + CAST(CAST(total_reserved_LOB_MB AS NUMERIC(29,1)) AS NVARCHAR(30)) + N'MB ' + CASE WHEN total_reserved_dictionary_MB = 0 THEN N'LOB' ELSE N'Columnstore' END
                ELSE ''
                END
                 + CASE WHEN total_reserved_row_overflow_MB > 1024 THEN
                    N'; ' + CAST(CAST(total_reserved_row_overflow_MB/1024. AS NUMERIC(29,1)) AS NVARCHAR(30)) + N'GB Row Overflow'
                WHEN total_reserved_row_overflow_MB > 0 THEN
                    N'; ' + CAST(CAST(total_reserved_row_overflow_MB AS NUMERIC(29,1)) AS NVARCHAR(30)) + N'MB Row Overflow'
                ELSE ''
                END
                 + CASE WHEN total_reserved_dictionary_MB > 1024 THEN
                    N'; ' + CAST(CAST(total_reserved_dictionary_MB/1024. AS NUMERIC(29,1)) AS NVARCHAR(30)) + N'GB Dictionaries'
                WHEN total_reserved_dictionary_MB > 0 THEN
                    N'; ' + CAST(CAST(total_reserved_dictionary_MB AS NUMERIC(29,1)) AS NVARCHAR(30)) + N'MB Dictionaries'
                ELSE ''
                END ,
                    N'Error- NULL in computed column'),
            index_op_stats AS ISNULL(
                (
                    REPLACE(CONVERT(NVARCHAR(30),CAST(total_singleton_lookup_count AS MONEY), 1),N'.00',N'') + N' singleton lookups; '
                    + REPLACE(CONVERT(NVARCHAR(30),CAST(total_range_scan_count AS MONEY), 1),N'.00',N'') + N' scans/seeks; '
                    + REPLACE(CONVERT(NVARCHAR(30),CAST(total_leaf_delete_count AS MONEY), 1),N'.00',N'') + N' deletes; '
                    + REPLACE(CONVERT(NVARCHAR(30),CAST(total_leaf_update_count AS MONEY), 1),N'.00',N'') + N' updates; '
                    + CASE WHEN ISNULL(total_forwarded_fetch_count,0) >0 THEN
                        REPLACE(CONVERT(NVARCHAR(30),CAST(total_forwarded_fetch_count AS MONEY), 1),N'.00',N'') + N' forward records fetched; '
                    ELSE N'' END

                    /* rows will only be in this dmv when data is in memory for the table */
                ), N'Table metadata not in memory'),
            index_lock_wait_summary AS ISNULL(
                CASE WHEN total_row_lock_wait_count = 0 AND  total_page_lock_wait_count = 0 AND
                    total_index_lock_promotion_attempt_count = 0 THEN N'0 lock waits; '
                    + CASE WHEN lock_escalation_desc = N'DISABLE' THEN N'Lock escalation DISABLE.'
                      ELSE N''
                      END
                ELSE
                    CASE WHEN total_row_lock_wait_count > 0 THEN
                        N'Row lock waits: ' + REPLACE(CONVERT(NVARCHAR(30),CAST(total_row_lock_wait_count AS MONEY), 1), N'.00', N'')
                        + N'; total duration: ' + 
                            CASE WHEN total_row_lock_wait_in_ms >= 60000 THEN /*More than 1 min*/
                                REPLACE(CONVERT(NVARCHAR(30),CAST((total_row_lock_wait_in_ms/60000) AS MONEY), 1), N'.00', N'') + N' minutes; '
                            ELSE                         
                                REPLACE(CONVERT(NVARCHAR(30),CAST(ISNULL(total_row_lock_wait_in_ms/1000,0) AS MONEY), 1), N'.00', N'') + N' seconds; '
                            END
                        + N'avg duration: ' + 
                            CASE WHEN avg_row_lock_wait_in_ms >= 60000 THEN /*More than 1 min*/
                                REPLACE(CONVERT(NVARCHAR(30),CAST((avg_row_lock_wait_in_ms/60000) AS MONEY), 1), N'.00', N'') + N' minutes; '
                            ELSE                         
                                REPLACE(CONVERT(NVARCHAR(30),CAST(ISNULL(avg_row_lock_wait_in_ms/1000,0) AS MONEY), 1), N'.00', N'') + N' seconds; '
                            END
                    ELSE N''
                    END +
                    CASE WHEN total_page_lock_wait_count > 0 THEN
                        N'Page lock waits: ' + REPLACE(CONVERT(NVARCHAR(30),CAST(total_page_lock_wait_count AS MONEY), 1), N'.00', N'')
                        + N'; total duration: ' + 
                            CASE WHEN total_page_lock_wait_in_ms >= 60000 THEN /*More than 1 min*/
                                REPLACE(CONVERT(NVARCHAR(30),CAST((total_page_lock_wait_in_ms/60000) AS MONEY), 1), N'.00', N'') + N' minutes; '
                            ELSE                         
                                REPLACE(CONVERT(NVARCHAR(30),CAST(ISNULL(total_page_lock_wait_in_ms/1000,0) AS MONEY), 1), N'.00', N'') + N' seconds; '
                            END
                        + N'avg duration: ' + 
                            CASE WHEN avg_page_lock_wait_in_ms >= 60000 THEN /*More than 1 min*/
                                REPLACE(CONVERT(NVARCHAR(30),CAST((avg_page_lock_wait_in_ms/60000) AS MONEY), 1), N'.00', N'') + N' minutes; '
                            ELSE                         
                                REPLACE(CONVERT(NVARCHAR(30),CAST(ISNULL(avg_page_lock_wait_in_ms/1000,0) AS MONEY), 1), N'.00', N'') + N' seconds; '
                            END
                    ELSE N''
                    END +
                    CASE WHEN total_index_lock_promotion_attempt_count > 0 THEN
                        N'Lock escalation attempts: ' + REPLACE(CONVERT(NVARCHAR(30),CAST(total_index_lock_promotion_attempt_count AS MONEY), 1), N'.00', N'')
                        + N'; Actual Escalations: ' + REPLACE(CONVERT(NVARCHAR(30),CAST(ISNULL(total_index_lock_promotion_count,0) AS MONEY), 1), N'.00', N'') +N'; '
                    ELSE N''
                    END +
                    CASE WHEN lock_escalation_desc = N'DISABLE' THEN
                        N'Lock escalation is disabled.'
                    ELSE N''
                    END
                END                  
                    ,'Error- NULL in computed column')
            );

        CREATE TABLE #IndexColumns
            (
              [database_id] INT NOT NULL,
			  [schema_name] NVARCHAR(128),
              [object_id] INT NOT NULL ,
              [index_id] INT NOT NULL ,
              [key_ordinal] INT NULL ,
              is_included_column BIT NULL ,
              is_descending_key BIT NULL ,
              [partition_ordinal] INT NULL ,
              column_name NVARCHAR(256) NOT NULL ,
              system_type_name NVARCHAR(256) NOT NULL,
              max_length SMALLINT NOT NULL,
              [precision] TINYINT NOT NULL,
              [scale] TINYINT NOT NULL,
              collation_name NVARCHAR(256) NULL,
              is_nullable BIT NULL,
              is_identity BIT NULL,
              is_computed BIT NULL,
              is_replicated BIT NULL,
              is_sparse BIT NULL,
              is_filestream BIT NULL,
              seed_value DECIMAL(38,0) NULL,
              increment_value DECIMAL(38,0) NULL ,
              last_value DECIMAL(38,0) NULL,
              is_not_for_replication BIT NULL
            );
        CREATE CLUSTERED INDEX CLIX_database_id_object_id_index_id ON #IndexColumns
            (database_id, object_id, index_id);

        CREATE TABLE #MissingIndexes
            ([database_id] INT NOT NULL,
			[object_id] INT NOT NULL,
            [database_name] NVARCHAR(128) NOT NULL ,
            [schema_name] NVARCHAR(128) NOT NULL ,
            [table_name] NVARCHAR(128),
            [statement] NVARCHAR(512) NOT NULL,
            magic_benefit_number AS (( user_seeks + user_scans ) * avg_total_user_cost * avg_user_impact),
            avg_total_user_cost NUMERIC(29,4) NOT NULL,
            avg_user_impact NUMERIC(29,1) NOT NULL,
            user_seeks BIGINT NOT NULL,
            user_scans BIGINT NOT NULL,
            unique_compiles BIGINT NULL,
            equality_columns NVARCHAR(MAX),
            equality_columns_with_data_type NVARCHAR(MAX),
            inequality_columns NVARCHAR(MAX),
            inequality_columns_with_data_type NVARCHAR(MAX),
            included_columns NVARCHAR(MAX),
            included_columns_with_data_type NVARCHAR(MAX),
			is_low BIT,
                [index_estimated_impact] AS 
                    REPLACE(CONVERT(NVARCHAR(256),CAST(CAST(
                                    (user_seeks + user_scans)
                                     AS BIGINT) AS MONEY), 1), '.00', '') + N' use' 
                        + CASE WHEN (user_seeks + user_scans) > 1 THEN N's' ELSE N'' END
                         +N'; Impact: ' + CAST(avg_user_impact AS NVARCHAR(30))
                        + N'%; Avg query cost: '
                        + CAST(avg_total_user_cost AS NVARCHAR(30)),
                [missing_index_details] AS
                    CASE WHEN COALESCE(equality_columns_with_data_type,equality_columns) IS NOT NULL
						THEN N'EQUALITY: ' + COALESCE(CAST(equality_columns_with_data_type AS NVARCHAR(MAX)), CAST(equality_columns AS NVARCHAR(MAX))) + N' '
                         ELSE N'' END +

                    CASE WHEN COALESCE(inequality_columns_with_data_type,inequality_columns) IS NOT NULL
						THEN N'INEQUALITY: ' + COALESCE(CAST(inequality_columns_with_data_type AS NVARCHAR(MAX)), CAST(inequality_columns AS NVARCHAR(MAX))) + N' '
                         ELSE N'' END +

                    CASE WHEN COALESCE(included_columns_with_data_type,included_columns) IS NOT NULL
						THEN N'INCLUDE: ' + COALESCE(CAST(included_columns_with_data_type AS NVARCHAR(MAX)), CAST(included_columns AS NVARCHAR(MAX))) + N' '
                         ELSE N'' END,
                [create_tsql] AS N'CREATE INDEX [' 
                    + LEFT(REPLACE(REPLACE(REPLACE(REPLACE(
                        ISNULL(equality_columns,N'')+ 
                        CASE WHEN equality_columns IS NOT NULL AND inequality_columns IS NOT NULL THEN N'_' ELSE N'' END
                        + ISNULL(inequality_columns,''),',','')
                        ,'[',''),']',''),' ','_') 
                    + CASE WHEN included_columns IS NOT NULL THEN N'_Includes' ELSE N'' END, 128) + N'] ON ' 
                    + [statement] + N' (' + ISNULL(equality_columns,N'')
                    + CASE WHEN equality_columns IS NOT NULL AND inequality_columns IS NOT NULL THEN N', ' ELSE N'' END
                    + CASE WHEN inequality_columns IS NOT NULL THEN inequality_columns ELSE N'' END + 
                    ') ' + CASE WHEN included_columns IS NOT NULL THEN N' INCLUDE (' + included_columns + N')' ELSE N'' END
                    + N' WITH (' 
                        + N'FILLFACTOR=100, ONLINE=?, SORT_IN_TEMPDB=?, DATA_COMPRESSION=?' 
                    + N')'
                    + N';'
                    ,
                [more_info] AS N'EXEC dbo.sp_BlitzIndex @DatabaseName=' + QUOTENAME([database_name],'''') + 
                    N', @SchemaName=' + QUOTENAME([schema_name],'''') + N', @TableName=' + QUOTENAME([table_name],'''') + N';',
				[sample_query_plan] XML NULL
            );

        CREATE TABLE #ForeignKeys (
			[database_id] INT NOT NULL,
            [database_name] NVARCHAR(128) NOT NULL ,
			[schema_name] NVARCHAR(128) NOT NULL ,
            foreign_key_name NVARCHAR(256),
            parent_object_id INT,
            parent_object_name NVARCHAR(256),
            referenced_object_id INT,
            referenced_object_name NVARCHAR(256),
            is_disabled BIT,
            is_not_trusted BIT,
            is_not_for_replication BIT,
            parent_fk_columns NVARCHAR(MAX),
            referenced_fk_columns NVARCHAR(MAX),
            update_referential_action_desc NVARCHAR(16),
            delete_referential_action_desc NVARCHAR(60)
        );

        CREATE TABLE #UnindexedForeignKeys 
        (
        	[database_id] INT NOT NULL,
            [database_name] NVARCHAR(128) NOT NULL ,
        	[schema_name] NVARCHAR(128) NOT NULL ,
            foreign_key_name NVARCHAR(256),
            parent_object_name NVARCHAR(256),
			parent_object_id INT,
			referenced_object_name NVARCHAR(256),
			referenced_object_id INT
        );
        
        CREATE TABLE #IndexCreateTsql (
            index_sanity_id INT NOT NULL,
            create_tsql NVARCHAR(MAX) NOT NULL
        );

        CREATE TABLE #DatabaseList (
			DatabaseName NVARCHAR(256),
            secondary_role_allow_connections_desc NVARCHAR(50)

        );

		CREATE TABLE #PartitionCompressionInfo (
			[index_sanity_id] INT NULL,
			[partition_compression_detail] NVARCHAR(4000) NULL
        );

		CREATE TABLE #Statistics (
		  database_id INT NOT NULL,
		  database_name NVARCHAR(256) NOT NULL,
		  table_name NVARCHAR(128) NULL,
		  schema_name NVARCHAR(128) NULL,
		  index_name  NVARCHAR(128) NULL,
		  column_names  NVARCHAR(MAX) NULL,
		  statistics_name NVARCHAR(128) NULL,
		  last_statistics_update DATETIME NULL,
		  days_since_last_stats_update INT NULL,
		  rows BIGINT NULL,
		  rows_sampled BIGINT NULL,
		  percent_sampled DECIMAL(18, 1) NULL,
		  histogram_steps INT NULL,
		  modification_counter BIGINT NULL,
		  percent_modifications DECIMAL(18, 1) NULL,
		  modifications_before_auto_update INT NULL,
		  index_type_desc NVARCHAR(128) NULL,
		  table_create_date DATETIME NULL,
		  table_modify_date DATETIME NULL,
		  no_recompute BIT NULL,
		  has_filter BIT NULL,
		  filter_definition NVARCHAR(MAX) NULL,
		  persisted_sample_percent FLOAT NULL
		); 

		CREATE TABLE #ComputedColumns
		(
		  index_sanity_id INT IDENTITY(1, 1) NOT NULL,
		  database_name NVARCHAR(128) NULL,
		  database_id INT NOT NULL,
		  table_name NVARCHAR(128) NOT NULL,
		  schema_name NVARCHAR(128) NOT NULL,
		  column_name NVARCHAR(128) NULL,
		  is_nullable BIT NULL,
		  definition NVARCHAR(MAX) NULL,
		  uses_database_collation BIT NOT NULL,
		  is_persisted BIT NOT NULL,
		  is_computed BIT NOT NULL,
		  is_function INT NOT NULL,
		  column_definition NVARCHAR(MAX) NULL
		);
		
		CREATE TABLE #TraceStatus
		(
		 TraceFlag NVARCHAR(10) ,
		 status BIT ,
		 Global BIT ,
		 Session BIT
		);

        CREATE TABLE #TemporalTables
        (
            index_sanity_id INT IDENTITY(1, 1) NOT NULL,
            database_name NVARCHAR(128) NOT NULL,
            database_id INT NOT NULL,
            schema_name NVARCHAR(128) NOT NULL,
            table_name NVARCHAR(128) NOT NULL,
            history_table_name NVARCHAR(128) NOT NULL,
            history_schema_name NVARCHAR(128) NOT NULL,
            start_column_name NVARCHAR(128) NOT NULL,
            end_column_name NVARCHAR(128) NOT NULL,
            period_name NVARCHAR(128) NOT NULL,
            history_table_object_id INT NULL
        );

		CREATE TABLE #CheckConstraints
		(
		  index_sanity_id INT IDENTITY(1, 1) NOT NULL,
		  database_name NVARCHAR(128) NULL,
		  database_id INT NOT NULL,
		  table_name NVARCHAR(128) NOT NULL,
		  schema_name NVARCHAR(128) NOT NULL,
		  constraint_name NVARCHAR(128) NULL,
		  is_disabled BIT NULL,
		  definition NVARCHAR(MAX) NULL,
		  uses_database_collation BIT NOT NULL,
		  is_not_trusted BIT NOT NULL,
		  is_function INT NOT NULL,
		  column_definition NVARCHAR(MAX) NULL
		);

		CREATE TABLE #FilteredIndexes
		(
		  index_sanity_id INT IDENTITY(1, 1) NOT NULL,
		  database_name NVARCHAR(128) NULL,
		  database_id INT NOT NULL,
		  schema_name NVARCHAR(128) NOT NULL,
		  table_name NVARCHAR(128) NOT NULL,
		  index_name NVARCHAR(128) NULL,
		  column_name NVARCHAR(128) NULL
		);

        CREATE TABLE #IndexResumableOperations
        (
		  database_name NVARCHAR(128) NULL,
		  database_id INT NOT NULL,
		  schema_name NVARCHAR(128) NOT NULL,
		  table_name NVARCHAR(128) NOT NULL,
 		  /*
          Every following non-computed column has
          the same definitions as in
          sys.index_resumable_operations.
          */
		  [object_id] INT NOT NULL,
		  index_id INT NOT NULL,
		  [name] NVARCHAR(128) NOT NULL,
          /*
          We have done nothing to make this query text pleasant
          to read. Until somebody has a better idea, we trust
          that copying Microsoft's approach is wise.
          */
		  sql_text NVARCHAR(MAX) NULL,
		  last_max_dop_used SMALLINT NOT NULL,
		  partition_number INT NULL,
		  state TINYINT NOT NULL,
		  state_desc NVARCHAR(60) NULL,
		  start_time DATETIME NOT NULL,
		  last_pause_time DATETIME NULL,
		  total_execution_time INT NOT NULL,
		  percent_complete FLOAT NOT NULL,
          page_count BIGINT NOT NULL,
          /*
          sys.indexes will not always have the name of the index
          because a resumable CREATE INDEX does not populate
          sys.indexes until it is done.
          So it is better to work out the full name here
          rather than pull it from another temp table.
          */
          [db_schema_table_index] AS
              [schema_name] + N'.' + [table_name] + N'.' + [name],
          /* For convenience. */
          reserved_MB_pretty_print AS
              CONVERT(NVARCHAR(100), CONVERT(MONEY, page_count * 8. / 1024.))
              + 'MB and '
              + state_desc,
          more_info AS
              N'New index: SELECT * FROM ' + QUOTENAME(database_name) +
              N'.sys.index_resumable_operations WHERE [object_id] = ' +
              CONVERT(NVARCHAR(100), [object_id]) +
              N'; Old index: ' +
              N'EXEC dbo.sp_BlitzIndex @DatabaseName=' + QUOTENAME([database_name],N'''') + 
			  N', @SchemaName=' + QUOTENAME([schema_name],N'''') +
              N', @TableName=' + QUOTENAME([table_name],N'''') + N';'
        );

        CREATE TABLE #Ignore_Databases 
        (
          DatabaseName NVARCHAR(128), 
          Reason NVARCHAR(100)
        );

/* Sanitize our inputs */
SELECT
	@OutputServerName = QUOTENAME(@OutputServerName),
	@OutputDatabaseName = QUOTENAME(@OutputDatabaseName),
	@OutputSchemaName = QUOTENAME(@OutputSchemaName),
	@OutputTableName = QUOTENAME(@OutputTableName);
					
					
IF @GetAllDatabases = 1
    BEGIN
        INSERT INTO #DatabaseList (DatabaseName)
        SELECT  DB_NAME(database_id)
        FROM    sys.databases
        WHERE user_access_desc = 'MULTI_USER'
        AND state_desc = 'ONLINE'
        AND database_id > 4
        AND DB_NAME(database_id) NOT LIKE 'ReportServer%'
        AND DB_NAME(database_id) NOT LIKE 'rdsadmin%'
		AND LOWER(name) NOT IN('dbatools', 'dbadmin', 'dbmaintenance')
        AND is_distributor = 0
		OPTION    ( RECOMPILE );

        /* Skip non-readable databases in an AG - see Github issue #1160 */
        IF EXISTS (SELECT * FROM sys.all_objects o INNER JOIN sys.all_columns c ON o.object_id = c.object_id AND o.name = 'dm_hadr_availability_replica_states' AND c.name = 'role_desc')
            BEGIN
            SET @dsql = N'UPDATE #DatabaseList SET secondary_role_allow_connections_desc = ''NO'' WHERE DatabaseName IN (
                        SELECT DB_NAME(d.database_id)
                        FROM sys.dm_hadr_availability_replica_states rs
                        INNER JOIN sys.databases d ON rs.replica_id = d.replica_id
                        INNER JOIN sys.availability_replicas r ON rs.replica_id = r.replica_id
                        WHERE rs.role_desc = ''SECONDARY''
                        AND r.secondary_role_allow_connections_desc = ''NO'')
						OPTION    ( RECOMPILE );';
            EXEC sp_executesql @dsql;

            IF EXISTS (SELECT * FROM #DatabaseList WHERE secondary_role_allow_connections_desc = 'NO')
                BEGIN
                INSERT    #BlitzIndexResults ( Priority, check_id, findings_group, finding, database_name, URL, details, index_definition,
                                                index_usage_summary, index_size_summary )
                VALUES  ( 1, 
				          0, 
		                  N'Skipped non-readable AG secondary databases.',
                          N'You are running this on an AG secondary, and some of your databases are configured as non-readable when this is a secondary node.',
				          N'To analyze those databases, run sp_BlitzIndex on the primary, or on a readable secondary.',
                          'http://FirstResponderKit.org', '', '', '', ''
                        );        
                END;
            END;

        IF @IgnoreDatabases IS NOT NULL
            AND LEN(@IgnoreDatabases) > 0
            BEGIN
                RAISERROR(N'Setting up filter to ignore databases', 0, 1) WITH NOWAIT;
                SET @DatabaseToIgnore = '';

                WHILE LEN(@IgnoreDatabases) > 0
                BEGIN
                    IF PATINDEX('%,%', @IgnoreDatabases) > 0
                    BEGIN  
                        SET @DatabaseToIgnore = SUBSTRING(@IgnoreDatabases, 0, PATINDEX('%,%',@IgnoreDatabases)) ;
                        
                        INSERT INTO #Ignore_Databases (DatabaseName, Reason)
                        SELECT LTRIM(RTRIM(@DatabaseToIgnore)), 'Specified in the @IgnoreDatabases parameter'
                        OPTION (RECOMPILE) ;
                        
                        SET @IgnoreDatabases = SUBSTRING(@IgnoreDatabases, LEN(@DatabaseToIgnore + ',') + 1, LEN(@IgnoreDatabases)) ;
                    END;
                    ELSE
                    BEGIN
                        SET @DatabaseToIgnore = @IgnoreDatabases ;
                        SET @IgnoreDatabases = NULL ;

                        INSERT INTO #Ignore_Databases (DatabaseName, Reason)
                        SELECT LTRIM(RTRIM(@DatabaseToIgnore)), 'Specified in the @IgnoreDatabases parameter'
                        OPTION (RECOMPILE) ;
                    END;
            END;
                
        END

    END;
ELSE
    BEGIN
        INSERT INTO #DatabaseList
                ( DatabaseName )
        SELECT CASE 
		            WHEN @DatabaseName IS NULL OR @DatabaseName = N'' 
		            THEN DB_NAME()
                    ELSE @DatabaseName END;
               END;

SET @NumDatabases = (SELECT COUNT(*) FROM #DatabaseList AS D LEFT OUTER JOIN #Ignore_Databases AS I ON D.DatabaseName = I.DatabaseName WHERE I.DatabaseName IS NULL AND ISNULL(D.secondary_role_allow_connections_desc, 'YES') != 'NO');
SET @msg = N'Number of databases to examine: ' + CAST(@NumDatabases AS NVARCHAR(50));
RAISERROR (@msg,0,1) WITH NOWAIT;



/* Running on 50+ databases can take a reaaallly long time, so we want explicit permission to do so (and only after warning about it) */


BEGIN TRY
        IF @NumDatabases >= 50 AND @BringThePain != 1 AND @TableName IS NULL
        BEGIN

            INSERT    #BlitzIndexResults ( Priority, check_id, findings_group, finding, URL, details, index_definition,
                                            index_usage_summary, index_size_summary )
            VALUES  ( -1, 
			          0 , 
		              @ScriptVersionName,
                      CASE WHEN @GetAllDatabases = 1 THEN N'All Databases' ELSE N'Database ' + QUOTENAME(@DatabaseName) + N' as of ' + CONVERT(NVARCHAR(16), GETDATE(), 121) END, 
					  N'http://FirstResponderKit.org',
                      N'From Your Community Volunteers',   
                      N'',
                      N'',
					  N''
                    );
            INSERT    #BlitzIndexResults ( Priority, check_id, findings_group, finding, database_name, URL, details, index_definition,
                                            index_usage_summary, index_size_summary )
            VALUES  ( 1, 
			          0, 
		              N'You''re trying to run sp_BlitzIndex on a server with ' + CAST(@NumDatabases AS NVARCHAR(8)) + N' databases. ',
                      N'Running sp_BlitzIndex on a server with 50+ databases may cause temporary problems for the server and/or user.',
					  '',