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Ce script permet d’estimer la compression pour toutes les tables et index de la base courante.
Source : Paul Nielsen (www. SQLServerBible.com)
Transact-SQL
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-- Estimates the row and page compression gain for every object and index in the database -- Paul Nielsen -- www.SQLServerBible.com -- March 13, 2008 -- to do: -- [ ] transaction error from insert...Exec sp_estimate_data_compression_savings -- [ ] filter objects to only those eligible for compression CREATE TABLE #ObjEst ( PK INT IDENTITY NOT NULL PRIMARY KEY , object_name VARCHAR(250) , schema_name VARCHAR(250) , index_id INT , partition_number INT , size_with_current_compression_setting BIGINT , size_with_requested_compression_setting BIGINT , sample_size_with_current_compression_setting BIGINT , sample_size_with_requested_compresison_setting BIGINT ); CREATE TABLE #dbEstimate ( PK INT IDENTITY NOT NULL PRIMARY KEY , schema_name VARCHAR(250) , object_name VARCHAR(250) , index_id INT , ixName VARCHAR(255) , ixType VARCHAR(50) , partition_number INT , data_compression_desc VARCHAR(50) , None_Size INT , Row_Size INT , Page_Size INT ); INSERT INTO #dbEstimate ( schema_name , object_name , index_id , ixName , ixType , partition_number , data_compression_desc ) SELECT S.name , O.name , I.index_id , I.name , I.type_desc , P.partition_number , P.data_compression_desc FROM sys.schemas AS S JOIN sys.objects AS O ON S.schema_id = O.schema_id JOIN sys.indexes AS I ON O.object_id = I.object_id JOIN sys.partitions AS P ON I.object_id = P.object_id AND I.index_id = P.index_id WHERE O.type = 'U'; -- Determine Compression Estimates DECLARE @PK INT , @Schema VARCHAR(150) , @object VARCHAR(150) , @DAD VARCHAR(25) , @partNO INT , @indexID INT , @SQL NVARCHAR(MAX); DECLARE cCompress CURSOR FAST_FORWARD FOR SELECT schema_name , object_name , index_id , partition_number , data_compression_desc FROM #dbEstimate; OPEN cCompress; FETCH cCompress INTO @Schema , @object , @indexID , @partNO , @DAD; -- prime the cursor WHILE @@Fetch_Status = 0 BEGIN IF @DAD = 'NONE' BEGIN -- estimate Page compression INSERT #ObjEst ( object_name , schema_name , index_id , partition_number , size_with_current_compression_setting , size_with_requested_compression_setting , sample_size_with_current_compression_setting , sample_size_with_requested_compresison_setting ) EXEC sp_estimate_data_compression_savings @schema_name = @Schema , @object_name = @object , @index_id = @indexID , @partition_number = @partNO , @data_compression = 'PAGE'; UPDATE #dbEstimate SET None_Size = O.size_with_current_compression_setting , Page_Size = O.size_with_requested_compression_setting FROM #dbEstimate D JOIN #ObjEst O ON D.schema_name = O.schema_name AND D.object_name = O.object_name AND D.index_id = O.index_id AND D.partition_number = O.partition_number; DELETE #ObjEst; -- estimate Row compression INSERT #ObjEst ( object_name , schema_name , index_id , partition_number , size_with_current_compression_setting , size_with_requested_compression_setting , sample_size_with_current_compression_setting , sample_size_with_requested_compresison_setting ) EXEC sp_estimate_data_compression_savings @schema_name = @Schema , @object_name = @object , @index_id = @indexID , @partition_number = @partNO , @data_compression = 'row'; UPDATE #dbEstimate SET Row_Size = O.size_with_requested_compression_setting FROM #dbEstimate D JOIN #ObjEst O ON D.schema_name = O.schema_name AND D.object_name = O.object_name AND D.index_id = O.index_id AND D.partition_number = O.partition_number; DELETE #ObjEst; END; -- none compression estimate IF @DAD = 'ROW' BEGIN -- estimate Page compression INSERT #ObjEst ( object_name , schema_name , index_id , partition_number , size_with_current_compression_setting , size_with_requested_compression_setting , sample_size_with_current_compression_setting , sample_size_with_requested_compresison_setting ) EXEC sp_estimate_data_compression_savings @schema_name = @Schema , @object_name = @object , @index_id = @indexID , @partition_number = @partNO , @data_compression = 'PAGE'; UPDATE #dbEstimate SET Row_Size = O.size_with_current_compression_setting , Page_Size = O.size_with_requested_compression_setting FROM #dbEstimate D JOIN #ObjEst O ON D.schema_name = O.schema_name AND D.object_name = O.object_name AND D.index_id = O.index_id AND D.partition_number = O.partition_number; DELETE #ObjEst; -- estimate None compression INSERT #ObjEst ( object_name , schema_name , index_id , partition_number , size_with_current_compression_setting , size_with_requested_compression_setting , sample_size_with_current_compression_setting , sample_size_with_requested_compresison_setting ) EXEC sp_estimate_data_compression_savings @schema_name = @Schema , @object_name = @object , @index_id = @indexID , @partition_number = @partNO , @data_compression = 'none'; UPDATE #dbEstimate SET None_Size = O.size_with_requested_compression_setting FROM #dbEstimate D JOIN #ObjEst O ON D.schema_name = O.schema_name AND D.object_name = O.object_name AND D.index_id = O.index_id AND D.partition_number = O.partition_number; DELETE #ObjEst; END; -- row compression estimate IF @DAD = 'PAGE' BEGIN -- estimate Row compression INSERT #ObjEst ( object_name , schema_name , index_id , partition_number , size_with_current_compression_setting , size_with_requested_compression_setting , sample_size_with_current_compression_setting , sample_size_with_requested_compresison_setting ) EXEC sp_estimate_data_compression_savings @schema_name = @Schema , @object_name = @object , @index_id = @indexID , @partition_number = @partNO , @data_compression = 'ROW'; UPDATE #dbEstimate SET Page_Size = O.size_with_current_compression_setting , Row_Size = O.size_with_requested_compression_setting FROM #dbEstimate D JOIN #ObjEst O ON D.schema_name = O.schema_name AND D.object_name = O.object_name AND D.index_id = O.index_id AND D.partition_number = O.partition_number; DELETE #ObjEst; -- estimate None compression INSERT #ObjEst ( object_name , schema_name , index_id , partition_number , size_with_current_compression_setting , size_with_requested_compression_setting , sample_size_with_current_compression_setting , sample_size_with_requested_compresison_setting ) EXEC sp_estimate_data_compression_savings @schema_name = @Schema , @object_name = @object , @index_id = @indexID , @partition_number = @partNO , @data_compression = 'NONE'; UPDATE #dbEstimate SET None_Size = O.size_with_requested_compression_setting FROM #dbEstimate D JOIN #ObjEst O ON D.schema_name = O.schema_name AND D.object_name = O.object_name AND D.index_id = O.index_id AND D.partition_number = O.partition_number; DELETE #ObjEst; END; -- page compression estimate FETCH cCompress INTO @Schema , @object , @indexID , @partNO , @DAD; END; CLOSE cCompress; DEALLOCATE cCompress; -- report findings SELECT schema_name + '.' + object_name AS [Object] , index_id , ixName , ixType , partition_number , data_compression_desc AS Current_Compression , CAST(( 1 - ( CAST(Row_Size AS FLOAT) / None_Size )) * 100 AS INT) AS RowGain , CAST(( 1 - ( CAST(Page_Size AS FLOAT) / None_Size )) * 100 AS INT) AS PageGain , CASE WHEN ( 1 - ( CAST(Row_Size AS FLOAT) / None_Size )) >= .25 AND ( Row_Size <= Page_Size ) THEN 'Row' WHEN ( 1 - ( CAST(Page_Size AS FLOAT) / None_Size )) >= .25 AND ( Page_Size <= Row_Size ) THEN 'Page' ELSE 'None' END AS Recommended_Compression FROM #dbEstimate WHERE None_Size <> 0 ORDER BY [Object]; 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