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‎MySQL/README.md‎

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# MySQL
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Dieser Root-Ordner ist fuer MySQL-spezifische Trainingsunterlagen und Crosslinks reserviert.
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## Verwandte Langform-Artikel
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- [Blog - Update with Join: Warum Kardinalitaet wichtiger ist als Syntax](../blog/update-with-join/README.md)
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- [Blog - Index Disable + Rebuild vs. Drop + Create: Wann welche Strategie sinnvoll ist](../blog/index_disable_rebuild_drop_create/README.md)
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- [Blog - Partitionierung: Wann mehrere Partitionen wirklich helfen - und wann nicht](../blog/partitionierung/README.md)
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- [Blog - Horizontale Partitionierung: eine partitionierte Tabelle oder mehrere Tabellen?](../blog/horizontale_partitionierung/README.md)

‎Oracle/README.md‎

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# Oracle
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Dieser Root-Ordner ist fuer Oracle-spezifische Trainingsunterlagen und Crosslinks reserviert.
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## Verwandte Langform-Artikel
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- [Blog - Update with Join: Warum Kardinalitaet wichtiger ist als Syntax](../blog/update-with-join/README.md)
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- [Blog - Index Disable + Rebuild vs. Drop + Create: Wann welche Strategie sinnvoll ist](../blog/index_disable_rebuild_drop_create/README.md)
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- [Blog - Partitionierung: Wann mehrere Partitionen wirklich helfen - und wann nicht](../blog/partitionierung/README.md)
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- [Blog - Horizontale Partitionierung: eine partitionierte Tabelle oder mehrere Tabellen?](../blog/horizontale_partitionierung/README.md)

‎PostgreSQL/README.md‎

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# PostgreSQL
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Dieser Root-Ordner ist fuer PostgreSQL-spezifische Trainingsunterlagen und Crosslinks reserviert.
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## Verwandte Langform-Artikel
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- [Blog - Update with Join: Warum Kardinalitaet wichtiger ist als Syntax](../blog/update-with-join/README.md)
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- [Blog - Index Disable + Rebuild vs. Drop + Create: Wann welche Strategie sinnvoll ist](../blog/index_disable_rebuild_drop_create/README.md)
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- [Blog - Partitionierung: Wann mehrere Partitionen wirklich helfen - und wann nicht](../blog/partitionierung/README.md)
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- [Blog - Horizontale Partitionierung: eine partitionierte Tabelle oder mehrere Tabellen?](../blog/horizontale_partitionierung/README.md)

‎SQLHana/README.md‎

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# SQLHana
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Dieser Root-Ordner ist fuer SQL-HANA-spezifische Trainingsunterlagen und Crosslinks reserviert.

‎T-SQL/19_Transaktions/SQLScripts/ListAllCriticalTransactionLogs.sql‎

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IF OBJECT_ID('tempdb..#LogSpace') IS NOT NULL
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DROP TABLE #LogSpace;
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CREATE TABLE #LogSpace
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(
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[Database Name] SYSNAME,
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[Log Size (MB)] DECIMAL(18,2),
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[Log Space Used (%)] DECIMAL(18,2),
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[Status] INT
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);
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INSERT INTO #LogSpace
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EXEC ('DBCC SQLPERF(LOGSPACE)');
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SELECT
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ls.[Database Name] AS DatabaseName,
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d.recovery_model_desc AS RecoveryModel,
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CAST(ls.[Log Size (MB)] AS DECIMAL(18,2)) AS LogSizeMB,
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CAST(ls.[Log Space Used (%)] AS DECIMAL(18,2)) AS LogUsedPct,
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d.log_reuse_wait_desc
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FROM #LogSpace AS ls
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INNER JOIN sys.databases AS d
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ON d.name = ls.[Database Name]
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WHERE ls.[Log Space Used (%)] >= 85
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ORDER BY ls.[Log Space Used (%)] DESC;

‎T-SQL/19_Transaktions/SQLScripts/ListTransactionLogs.sql‎

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IF OBJECT_ID('tempdb..#LogSpace') IS NOT NULL
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DROP TABLE #LogSpace;
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CREATE TABLE #LogSpace
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(
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[Database Name] SYSNAME,
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[Log Size (MB)] DECIMAL(18,2),
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[Log Space Used (%)] DECIMAL(18,2),
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[Status] INT
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);
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INSERT INTO #LogSpace
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EXEC ('DBCC SQLPERF(LOGSPACE)');
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SELECT
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ls.[Database Name] AS DatabaseName,
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d.state_desc AS DatabaseState,
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d.recovery_model_desc AS RecoveryModel,
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CAST(ls.[Log Size (MB)] AS DECIMAL(18,2)) AS LogSizeMB,
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CAST(ls.[Log Space Used (%)] AS DECIMAL(18,2)) AS LogUsedPct,
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CAST(ls.[Log Size (MB)] * ls.[Log Space Used (%)] / 100.0 AS DECIMAL(18,2)) AS LogUsedMB,
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CAST(ls.[Log Size (MB)] * (100.0 - ls.[Log Space Used (%)]) / 100.0 AS DECIMAL(18,2)) AS LogFreeMB,
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d.log_reuse_wait_desc,
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CASE
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WHEN ls.[Log Space Used (%)] >= 95 THEN 'KRITISCH'
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WHEN ls.[Log Space Used (%)] >= 85 THEN 'HOCH'
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WHEN ls.[Log Space Used (%)] >= 70 THEN 'BEOBACHTEN'
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ELSE 'OK'
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END AS LogStatus
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FROM #LogSpace AS ls
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LEFT JOIN sys.databases AS d
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ON d.name = ls.[Database Name]
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ORDER BY
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ls.[Log Space Used (%)] DESC,
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ls.[Log Size (MB)] DESC;

‎T-SQL/19_Transaktions/SQLScripts/RecoveryModelSimpleFullWhy_AllDB.sql‎

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DECLARE @DBName SYSNAME = N'BI_DWH';
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SELECT
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d.name AS DatabaseName,
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d.state_desc,
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d.recovery_model_desc,
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ls.total_log_size_mb,
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ls.active_log_size_mb,
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CAST(
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CASE
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WHEN ls.total_log_size_mb > 0
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THEN (ls.active_log_size_mb * 100.0) / ls.total_log_size_mb
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ELSE 0
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END
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AS DECIMAL(10,2)
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) AS LogUsedPct,
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d.log_reuse_wait_desc,
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ls.log_truncation_holdup_reason,
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ls.log_since_last_log_backup_mb,
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ls.log_backup_time
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FROM sys.databases AS d
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CROSS APPLY sys.dm_db_log_stats(d.database_id) AS ls
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WHERE d.name = @DBName;

‎T-SQL/19_Transaktions/SQLScripts/RecoveryModelSimpleFullWhy_SpecificDB.sql‎

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SELECT
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d.name AS DatabaseName,
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d.state_desc,
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d.recovery_model_desc,
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ls.total_log_size_mb,
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ls.active_log_size_mb,
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CAST(
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CASE
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WHEN ls.total_log_size_mb > 0
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THEN (ls.active_log_size_mb * 100.0) / ls.total_log_size_mb
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ELSE 0
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END
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AS DECIMAL(10,2)
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) AS LogUsedPct,
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d.log_reuse_wait_desc,
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ls.log_truncation_holdup_reason,
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ls.log_since_last_log_backup_mb,
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ls.log_backup_time,
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CASE d.log_reuse_wait_desc
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WHEN 'NOTHING' THEN 'Der Log kann wiederverwendet werden; akuter Reuse-Blocker ist nicht sichtbar.'
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WHEN 'CHECKPOINT' THEN 'Bei SIMPLE wird Log-Space typischerweise erst nach Checkpoint wiederverwendbar.'
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WHEN 'ACTIVE_TRANSACTION' THEN 'Eine lange/offene Transaktion verhindert die Log-Wiederverwendung.'
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WHEN 'ACTIVE_BACKUP_OR_RESTORE' THEN 'Backup- oder Restore-Vorgang blockiert aktuell die Wiederverwendung.'
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WHEN 'REPLICATION' THEN 'Replikation/Verteilung hält Log-Einträge noch fest.'
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WHEN 'DATABASE_MIRRORING' THEN 'Spiegelung/entsprechende Synchronisation blockiert die Wiederverwendung.'
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WHEN 'AVAILABILITY_REPLICA' THEN 'Eine Availability Replica hält die Wiederverwendung zurück.'
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WHEN 'XTP_CHECKPOINT' THEN 'In-Memory-OLTP-Checkpoint hält die Wiederverwendung zurück.'
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ELSE 'Details über log_reuse_wait_desc bzw. log_truncation_holdup_reason prüfen.'
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END AS Interpretation
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FROM sys.databases AS d
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CROSS APPLY sys.dm_db_log_stats(d.database_id) AS ls
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WHERE d.recovery_model_desc = 'SIMPLE'
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ORDER BY
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LogUsedPct DESC,
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ls.active_log_size_mb DESC;

‎T-SQL/19_Transaktions/SQLScripts/ReuseWait_REPLICATION.sql‎

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‎T-SQL/19_Transaktions/SQLScripts/SetDBSimple.sql‎

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SET NOCOUNT ON;
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DECLARE @DBName SYSNAME = N'DeineDatenbank';
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DECLARE @ReserveAfterShrinkMB INT = 512; -- freier Puffer nach dem Shrink
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DECLARE @MinimumTargetSizeMB INT = 256; -- Logdatei nie kleiner als dieser Wert
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DECLARE @MinShrinkGainMB INT = 256; -- nur shrinken, wenn mindestens so viele MB frei werden
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DECLARE @RecoveryModelBefore NVARCHAR(60);
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DECLARE @RecoveryModelAfter NVARCHAR(60);
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DECLARE @LogReuseWaitDesc NVARCHAR(120);
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DECLARE @LogSizeMB DECIMAL(18,2);
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DECLARE @LogUsedPct DECIMAL(18,2);
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DECLARE @LogUsedMB DECIMAL(18,2);
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DECLARE @LogFreeMB DECIMAL(18,2);
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DECLARE @LogFileCount INT;
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DECLARE @LogFileId INT;
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DECLARE @ShrinkTargetMB INT;
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DECLARE @ShrinkGainMB DECIMAL(18,2);
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DECLARE @sql NVARCHAR(MAX);
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DECLARE @Action NVARCHAR(4000) = N'';
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DECLARE @DidShrink BIT = 0;
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IF DB_ID(@DBName) IS NULL
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BEGIN
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THROW 50000, 'Die angegebene Datenbank existiert nicht.', 1;
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END;
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IF OBJECT_ID('tempdb..#LogSpace') IS NOT NULL
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DROP TABLE #LogSpace;
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CREATE TABLE #LogSpace
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(
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[Database Name] SYSNAME,
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[Log Size (MB)] DECIMAL(18,2),
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[Log Space Used (%)] DECIMAL(18,2),
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[Status] INT
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);
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INSERT INTO #LogSpace
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EXEC ('DBCC SQLPERF(LOGSPACE)');
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SELECT
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@RecoveryModelBefore = d.recovery_model_desc,
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@LogReuseWaitDesc = d.log_reuse_wait_desc,
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@LogSizeMB = ls.[Log Size (MB)],
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@LogUsedPct = ls.[Log Space Used (%)],
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@LogUsedMB = CAST(ls.[Log Size (MB)] * ls.[Log Space Used (%)] / 100.0 AS DECIMAL(18,2)),
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@LogFreeMB = CAST(ls.[Log Size (MB)] * (100.0 - ls.[Log Space Used (%)]) / 100.0 AS DECIMAL(18,2))
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FROM sys.databases AS d
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INNER JOIN #LogSpace AS ls
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ON ls.[Database Name] = d.name
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WHERE d.name = @DBName;
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SELECT
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@LogFileCount = COUNT(*),
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@LogFileId = CASE WHEN COUNT(*) = 1 THEN MAX(file_id) END
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FROM sys.master_files
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WHERE database_id = DB_ID(@DBName)
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AND type = 1; -- LOG
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SELECT
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[Step] = 'Before',
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DatabaseName = @DBName,
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RecoveryModel = @RecoveryModelBefore,
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LogReuseWaitDesc = @LogReuseWaitDesc,
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LogFileCount = @LogFileCount,
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LogSizeMB = @LogSizeMB,
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LogUsedPct = @LogUsedPct,
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LogUsedMB = @LogUsedMB,
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LogFreeMB = @LogFreeMB;
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IF @RecoveryModelBefore <> N'SIMPLE'
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BEGIN
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SET @sql = N'ALTER DATABASE ' + QUOTENAME(@DBName) + N' SET RECOVERY SIMPLE;';
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EXEC sys.sp_executesql @sql;
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SET @Action = N'Recovery Model wurde auf SIMPLE gesetzt. ';
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END
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ELSE
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BEGIN
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SET @Action = N'Datenbank war bereits SIMPLE. ';
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END;
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SET @sql = N'USE ' + QUOTENAME(@DBName) + N'; CHECKPOINT;';
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EXEC sys.sp_executesql @sql;
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TRUNCATE TABLE #LogSpace;
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INSERT INTO #LogSpace
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EXEC ('DBCC SQLPERF(LOGSPACE)');
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SELECT
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@RecoveryModelAfter = d.recovery_model_desc,
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@LogReuseWaitDesc = d.log_reuse_wait_desc,
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@LogSizeMB = ls.[Log Size (MB)],
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@LogUsedPct = ls.[Log Space Used (%)],
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@LogUsedMB = CAST(ls.[Log Size (MB)] * ls.[Log Space Used (%)] / 100.0 AS DECIMAL(18,2)),
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@LogFreeMB = CAST(ls.[Log Size (MB)] * (100.0 - ls.[Log Space Used (%)]) / 100.0 AS DECIMAL(18,2))
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FROM sys.databases AS d
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INNER JOIN #LogSpace AS ls
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ON ls.[Database Name] = d.name
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WHERE d.name = @DBName;
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SET @ShrinkTargetMB =
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CASE
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WHEN CEILING(@LogUsedMB + @ReserveAfterShrinkMB) > @MinimumTargetSizeMB
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THEN CAST(CEILING(@LogUsedMB + @ReserveAfterShrinkMB) AS INT)
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ELSE @MinimumTargetSizeMB
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END;
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SET @ShrinkGainMB = CAST(@LogSizeMB - @ShrinkTargetMB AS DECIMAL(18,2));
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SELECT
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[Step] = 'After Recovery Change / Checkpoint',
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DatabaseName = @DBName,
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RecoveryModel = @RecoveryModelAfter,
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LogReuseWaitDesc = @LogReuseWaitDesc,
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LogFileCount = @LogFileCount,
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LogSizeMB = @LogSizeMB,
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LogUsedPct = @LogUsedPct,
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LogUsedMB = @LogUsedMB,
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LogFreeMB = @LogFreeMB,
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ShrinkTargetMB = @ShrinkTargetMB,
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ShrinkGainMB = @ShrinkGainMB;
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IF @LogFileCount <> 1
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BEGIN
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SET @Action = @Action + N'Kein Shrink durchgeführt, da die Datenbank nicht genau eine Logdatei hat.';
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END
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ELSE IF @ShrinkGainMB < @MinShrinkGainMB
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BEGIN
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SET @Action = @Action + N'Kein Shrink durchgeführt, da das Shrink-Potenzial kleiner als der Schwellwert ist.';
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END
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ELSE IF @ShrinkTargetMB >= CEILING(@LogSizeMB)
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BEGIN
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SET @Action = @Action + N'Kein Shrink durchgeführt, da die Zielgröße nicht kleiner als die aktuelle Größe ist.';
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END
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ELSE
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BEGIN
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SET @sql =
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N'USE ' + QUOTENAME(@DBName) + N';
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DBCC SHRINKFILE (' + CAST(@LogFileId AS NVARCHAR(20)) + N', ' + CAST(@ShrinkTargetMB AS NVARCHAR(20)) + N');';
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EXEC sys.sp_executesql @sql;
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SET @DidShrink = 1;
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SET @Action = @Action + N'Logdatei wurde geschrumpft.';
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END;
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TRUNCATE TABLE #LogSpace;
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INSERT INTO #LogSpace
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EXEC ('DBCC SQLPERF(LOGSPACE)');
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SELECT
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@LogReuseWaitDesc = d.log_reuse_wait_desc,
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@LogSizeMB = ls.[Log Size (MB)],
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@LogUsedPct = ls.[Log Space Used (%)],
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@LogUsedMB = CAST(ls.[Log Size (MB)] * ls.[Log Space Used (%)] / 100.0 AS DECIMAL(18,2)),
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@LogFreeMB = CAST(ls.[Log Size (MB)] * (100.0 - ls.[Log Space Used (%)]) / 100.0 AS DECIMAL(18,2))
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FROM sys.databases AS d
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INNER JOIN #LogSpace AS ls
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ON ls.[Database Name] = d.name
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WHERE d.name = @DBName;
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SELECT
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[Step] = 'Final',
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DatabaseName = @DBName,
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RecoveryModel = @RecoveryModelAfter,
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LogReuseWaitDesc = @LogReuseWaitDesc,
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LogFileCount = @LogFileCount,
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LogSizeMB = @LogSizeMB,
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LogUsedPct = @LogUsedPct,
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LogUsedMB = @LogUsedMB,
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LogFreeMB = @LogFreeMB,
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ShrinkTargetMB = @ShrinkTargetMB,
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ShrinkPerformed = @DidShrink,
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ActionSummary = @Action;

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