Попробуйте это ... это приблизит меня. Я использовал статью msdn для создания. Вы можете установить количество строк. Это будет делать каждая таблица в db, включая индексы. Пока не работает столбцов, и они не будут обрабатывать отношения. Он просто применит оценку rowcount к каждой таблице.
/*Do NOT change this section*/
GO
CREATE TABLE RowSizes (TypeName VARCHAR(30), TableName VARCHAR(255), IndexName VARCHAR(255), Null_Bitmap SMALLINT, VariableFieldSize BIGINT, FixedFieldSize BIGINT, Row_Size BIGINT, LOBFieldSize BIGINT);
CREATE TABLE LeafSizes (TypeName VARCHAR(30), TableName VARCHAR(255), IndexName VARCHAR(255), Row_Size BIGINT, Rows_Per_Page BIGINT, Free_Rows_Per_Page BIGINT, Non_Leaf_Levels BIGINT, Num_Leaf_Pages BIGINT, Num_Index_Pages BIGINT, Leaf_space_used_bytes BIGINT);
GO
CREATE PROCEDURE dbo.cp_CalcIndexPages
@IndexType VARCHAR(20)
AS
BEGIN
DECLARE @IndexName VARCHAR(255)
, @TableName varchar(255)
, @Non_Leaf_Levels bigint = 127
, @Rows_Per_Page bigint = 476
, @Num_Leaf_Pages bigint =10000;
WHILE EXISTS(SELECT TOP 1 1 FROM dbo.LeafSizes WHERE TypeName = @IndexType AND Num_Index_Pages = 0)-- AND IndexName = 'PK_ProcessingMessages')
BEGIN
SELECT TOP 1 @IndexName = IndexName
, @TableName = TableName
, @Non_Leaf_Levels = Non_Leaf_Levels
, @Rows_Per_Page = Rows_Per_Page
, @Num_Leaf_Pages = Num_Leaf_Pages
FROM dbo.LeafSizes
WHERE TypeName = @IndexType
AND Num_Index_Pages = 0;
DECLARE @Counter INT = 1
, @Num_Index_Pages INT = 0;
WHILE @Counter <= @Non_Leaf_Levels
BEGIN
BEGIN TRY
SELECT @Num_Index_Pages += ROUND(CASE WHEN @Num_Leaf_Pages/POWER(@Rows_Per_Page, @Counter) < CONVERT(FLOAT, 1) THEN 1 ELSE @Num_Leaf_Pages/POWER(@Rows_Per_Page, @Counter) END, 0)
END TRY
BEGIN CATCH
SET @Num_Index_Pages += 1
END CATCH
SET @Counter += 1
END
IF @Num_Index_Pages = 0
SET @Num_Index_Pages = 1;
UPDATE dbo.LeafSizes
SET Num_Index_Pages = @Num_Index_Pages
, Leaf_space_used_bytes = 8192 * @Num_Index_Pages
WHERE TableName = @TableName
AND IndexName = @IndexName;
END
END
GO
/*Do NOT change above here*/
--Set parameters here
DECLARE @NumRows INT = 1000000 --Number of rows for estimate
,@VarPercentFill money = .6; --Percentage of variable field space used to estimate. 1 will provide estimate as if all variable columns are 100% full.
/*Do not change*/
WITH cte_Tables AS (--Get Tables
SELECT o.object_id, s.name+'.'+o.name AS ObjectName
FROM sys.objects o
INNER JOIN sys.schemas s ON o.schema_id = s.schema_id
WHERE type = 'U'
), cte_TableData AS (--Calculate Field Sizes
SELECT o.ObjectName AS TableName
, SUM(CASE WHEN t.name IN ('int', 'bigint', 'tinyint', 'char', 'datetime', 'smallint', 'date') THEN 1 ELSE 0 END) AS FixedFields
, SUM(CASE WHEN t.name IN ('int', 'bigint', 'tinyint', 'char', 'datetime', 'smallint', 'date') THEN c.max_length ELSE 0 END) AS FixedFieldSize
, SUM(CASE WHEN t.name IN ('varchar') THEN 1 ELSE 0 END) AS VariableFields
, SUM(CASE WHEN t.name IN ('varchar') THEN c.max_length ELSE 0 END)*@VarPercentFill AS VariableFieldSize
, SUM(CASE WHEN t.name IN ('xml') THEN 1 ELSE 0 END) AS LOBFields
, SUM(CASE WHEN t.name IN ('xml') THEN 10000 ELSE 0 END) AS LOBFieldSize
, COUNT(1) AS TotalColumns
FROM sys.columns c
INNER JOIN cte_Tables o ON o.object_id = c.object_id
INNER JOIN sys.types t ON c.system_type_id = t.system_type_id
GROUP BY o.ObjectName
), cte_Indexes AS (--Get Indexes and size
SELECT s.name+'.'+o.name AS TableName
, ISNULL(i.name, '') AS IndexName
, i.type_desc
, i.index_id
, SUM(CASE WHEN t.name IN ('tinyint','smallint', 'int', 'bigint', 'char', 'datetime', 'date') AND c.key_ordinal > 0 THEN 1 ELSE 0 END) AS FixedFields
, SUM(CASE WHEN t.name IN ('tinyint','smallint', 'int', 'bigint', 'char', 'datetime', 'date') AND c.key_ordinal > 0 THEN tc.max_length ELSE 0 END) AS FixedFieldSize
, SUM(CASE WHEN t.name IN ('varchar') AND c.key_ordinal > 0 THEN 1 ELSE 0 END) AS VariableFields
, SUM(CASE WHEN t.name IN ('varchar') AND c.key_ordinal > 0 THEN tc.max_length ELSE 0 END)*@VarPercentFill AS VariableFieldSize
, SUM(CASE WHEN t.name IN ('xml') AND c.key_ordinal > 0 THEN 1 ELSE 0 END) AS LOBFields
, SUM(CASE WHEN t.name IN ('xml') AND c.key_ordinal > 0 THEN 10000 ELSE 0 END) AS LOBFieldSize
, SUM(CASE WHEN t.name IN ('tinyint','smallint', 'int', 'bigint', 'char', 'datetime', 'date') AND c.is_included_column > 0 THEN 1 ELSE 0 END) AS FixedIncludes
, SUM(CASE WHEN t.name IN ('tinyint','smallint', 'int', 'bigint', 'char', 'datetime', 'date') AND c.is_included_column > 0 THEN 1 ELSE 0 END) AS FixedIncludesSize
, SUM(CASE WHEN t.name IN ('varchar') AND c.is_included_column > 0 THEN 1 ELSE 0 END)*@VarPercentFill AS VariableIncludes
, SUM(CASE WHEN t.name IN ('varchar') AND c.is_included_column > 0 THEN tc.max_length ELSE 0 END) AS VariableIncludesSize
, COUNT(1) AS TotalColumns
FROM sys.indexes i
INNER JOIN sys.columns tc ON i.object_id = tc.object_id
INNER JOIN sys.index_columns c ON i.index_id = c.index_id
AND c.column_id = tc.column_id
AND c.object_id = i.object_id
INNER JOIN sys.objects o ON o.object_id = i.object_id AND o.is_ms_shipped = 0
INNER JOIN sys.schemas s ON o.schema_id = s.schema_id
INNER JOIN sys.types t ON tc.system_type_id = t.system_type_id
GROUP BY s.name+'.'+o.name, ISNULL(i.name, ''), i.type_desc, i.index_id
)
INSERT RowSizes
SELECT 'Table' AS TypeName
, n.TableName
, '' AS IndexName
, 2 + ((n.FixedFields+n.VariableFields+7)/8) AS Null_Bitmap
, 2 + (n.VariableFields * 2) + n.VariableFieldSize AS Variable_Data_Size
, n.FixedFieldSize
/*FixedFieldSize + Variable_Data_Size + Null_Bitmap*/
, n.FixedFieldSize + (2 + (n.VariableFields * 2) + (n.VariableFieldSize)) + (2 + ((n.FixedFields+n.VariableFields+7)/8)) + 4 AS Row_Size
, n.LOBFieldSize
FROM cte_TableData n
UNION
SELECT i.type_desc
, i.TableName
, i.IndexName
, 0 AS Null_Bitmap
, CASE WHEN i.VariableFields > 0 THEN 2 + (i.VariableFields * 2) + i.VariableFieldSize + 4 ELSE 0 END AS Variable_Data_Size
, i.FixedFieldSize
/*FixedFieldSize + Variable_Data_Size + Null_Bitmap if not clustered*/
, i.FixedFieldSize + CASE WHEN i.VariableFields > 0 THEN 2 + (i.VariableFields * 2) + i.VariableFieldSize + 4 ELSE 0 END + 7 AS Row_Size
, i.LOBFieldSize
FROM cte_Indexes i
WHERE i.index_id IN(0,1)
UNION
SELECT i.type_desc
, i.TableName
, i.IndexName
, CASE WHEN si.TotalColumns IS NULL THEN 2 + ((i.FixedFields+i.VariableFields+i.VariableIncludes+i.FixedIncludes+8)/8)
ELSE 2 + ((i.FixedFields+i.VariableFields+i.VariableIncludes+i.FixedIncludes+7)/8)
END AS Null_Bitmap
, CASE WHEN si.TotalColumns IS NULL THEN 2 + ((i.VariableFields + 1) * 2) + (i.VariableFieldSize + 8)
ELSE 2 + (i.VariableFields * 2) + i.VariableFieldSize
END AS Variable_Data_Size
, CASE WHEN si.TotalColumns IS NULL THEN si.FixedFieldSize
ELSE i.FixedFieldSize + si.FixedFieldSize
END AS FixedFieldSize
/*FixedFieldSize + Variable_Data_Size + Null_Bitmap if not clustered*/
, CASE WHEN si.TotalColumns IS NULL THEN i.FixedFieldSize + (2 + ((i.VariableFields + 1) * 2) + (i.VariableFieldSize + 8)) + (2 + ((i.TotalColumns+8)/8)) + 7
ELSE i.FixedFieldSize + (2 + (i.VariableFields * 2) + i.VariableFieldSize) + (2 + ((i.TotalColumns+7)/8)) + 4
END AS Row_Size
, i.LOBFieldSize
FROM cte_Indexes i
LEFT OUTER JOIN cte_Indexes si ON i.TableName = si.TableName AND si.type_desc = 'CLUSTERED'
WHERE i.index_id NOT IN(0,1) AND i.type_desc = 'NONCLUSTERED';
--SELECT * FROM RowSizes
/*Calculate leaf sizes for tables and HEAPs*/
INSERT LeafSizes
SELECT r.TypeName
, r.TableName
,'' AS IndexName
, r.Row_Size
, 8096/(r.Row_Size + 2) AS Rows_Per_Page
, 8096 * ((100 - 90)/100)/(r.Row_Size + 2) AS Free_Rows_Per_Page
, 0 AS Non_Leaf_Levels
/*Num_Leaf_Pages = Number of Rows/(Rows_Per_Page - Free_Rows_Per_Page) OR 1 if less than 1*/
, CASE WHEN @NumRows/((8096/(r.Row_Size + 2)) - (8096 * ((100 - 90)/100)/(r.Row_Size + 2))) < 1
THEN 1
ELSE @NumRows/((8096/(r.Row_Size + 2)) - (8096 * ((100 - 90)/100)/(r.Row_Size + 2)))
END AS Num_Leaf_Pages
, 0 AS Num_Index_Pages
/*Leaf_space_used = 8192 * Num_Leaf_Pages*/
, 8192 * CASE WHEN @NumRows/((8096/(r.Row_Size + 2)) - (8096 * ((100 - 90)/100)/(r.Row_Size + 2))) < 1
THEN 1
ELSE @NumRows/((8096/(r.Row_Size + 2)) - (8096 * ((100 - 90)/100)/(r.Row_Size + 2)))
END + (@NumRows * LOBFieldSize) AS Leaf_space_used_bytes
FROM RowSizes r
WHERE r.TypeName = 'Table'
ORDER BY TypeName, TableName;
/*Calculate leaf sizes for CLUSTERED indexes*/
INSERT LeafSizes
SELECT r.TypeName
, r.TableName
, r.IndexName
, r.Row_Size
, 8096/(r.Row_Size + 2) AS Rows_Per_Page
, 0 AS Free_Rows_Per_Page
, 1 + ROUND(LOG(8096/(r.Row_Size + 2)), 0)*(l.Num_Leaf_Pages/(8096/(r.Row_Size + 2))) AS Non_Leaf_Levels
, l.Num_Leaf_Pages
, 0 AS Num_Index_Pages
, 0 AS Leaf_space_used_bytes
FROM RowSizes r
INNER JOIN LeafSizes l ON r.TableName = l.TableName AND l.TypeName = 'Table'
WHERE r.TypeName = 'CLUSTERED';
PRINT 'CLUSTERED'
EXEC dbo.cp_CalcIndexPages @IndexType = 'CLUSTERED'
/*Calculate leaf sizes for NONCLUSTERED indexes*/
INSERT LeafSizes
SELECT r.TypeName
, r.TableName
, r.IndexName
, r.Row_Size
, 8096/(r.Row_Size + 2) AS Rows_Per_Page
, 0 AS Free_Rows_Per_Page
, 1 + ROUND(LOG(8096/(r.Row_Size + 2)), 0)*(l.Num_Leaf_Pages/(8096/(r.Row_Size + 2))) AS Non_Leaf_Levels
, l.Num_Leaf_Pages
, 0 AS Num_Index_Pages
, 0 AS Leaf_space_used_bytes
FROM RowSizes r
INNER JOIN LeafSizes l ON r.TableName = l.TableName AND l.TypeName = 'Table'
WHERE r.TypeName = 'NONCLUSTERED';
PRINT 'NONCLUSTERED'
EXEC dbo.cp_CalcIndexPages @IndexType = 'NONCLUSTERED'
SELECT *
FROM dbo.LeafSizes
--WHERE TableName = 'eligibility.clientrequest'
SELECT TableName
, @NumRows AS RowsPerTable
, @VarPercentFill*100 AS VariableFieldFillFactor
, SUM(CASE WHEN TypeName = 'Table' THEN Leaf_space_used_bytes ELSE 0 END)/1024/1024 AS TableSizeMB
, SUM(Leaf_space_used_bytes)/1024/1024 AS SizeWithIndexesMB
FROM LeafSizes
--WHERE TableName = 'eligibility.clientrequest'
GROUP BY TableName
ORDER BY TableName;
GO
/*Cleanup when done*/
DROP PROCEDURE dbo.cp_CalcIndexPages;
DROP TABLE dbo.RowSizes;
DROP TABLE dbo.LeafSizes;
Я не уверен, но быстрый поиск в Google вызывает официальную страницу MSDN с более конкретными инструкциями ... возможно, попробуйте? https://msdn.microsoft.com/en-us/library/ms175991.aspx (Похоже, возможно, он вычисляет размер индекса, который отличается от всего объема данных) – jleach
Я действительно пытаюсь это сделать. Но у меня есть некоторые отличия (почти 10 МБ). – Cedric
Вместо среднего, вы могли бы суммировать len 'value'. –