SQL Server Index reconstruction, SQL Server Index

SQL Server Index reconstruction, SQL Server Index

The company's online data has tens of millions of data records. Sometimes index fragmentation may cause indexes to fail to meet our expected query efficiency. At this time, re-indexing will improve the efficiency, however, during reconstruction, there must be fewer users at night, and index reconstruction takes some time.

Paste the automatic index reconstruction script directly.

 1 DECLARE @Database VARCHAR(255);   2 DECLARE @Table VARCHAR(255);   3 DECLARE @cmd NVARCHAR(500);   4 DECLARE @fillfactor INT; 5 SET @fillfactor = 90; 6 DECLARE DatabaseCursor CURSOR 7 FOR 8     SELECT  name 9     FROM    master.dbo.sysdatabases10     WHERE   name IN ( 'ChemicalInfo_ALLFULL_New' )11     ORDER BY 1;  12 OPEN DatabaseCursor;  13 FETCH NEXT FROM DatabaseCursor INTO @Database;  14 WHILE @@FETCH_STATUS = 015     BEGIN  16         SET @cmd = 'DECLARE TableCursor CURSOR FOR SELECT ''['' + table_catalog + ''].['' + table_schema + ''].['' +17   table_name + '']'' as tableName FROM [' + @Database18             + '].INFORMATION_SCHEMA.TABLES19   WHERE table_type = ''BASE TABLE''';  20    -- create table cursor  21         EXEC (@cmd);  22         OPEN TableCursor;  23         FETCH NEXT FROM TableCursor INTO @Table;  24         WHILE @@FETCH_STATUS = 025             BEGIN  26                 IF ( @@MICROSOFTVERSION / POWER(2, 24) >= 9 )27                     BEGIN28            -- SQL 2005 or higher command29                         SET @cmd = 'ALTER INDEX ALL ON ' + @Table30                             + ' REBUILD WITH (FILLFACTOR = '31                             + CONVERT(VARCHAR(3), @fillfactor) + ')';32                         EXEC (@cmd);33                     END;34                 ELSE35                     BEGIN36           -- SQL 2000 command37                         DBCC DBREINDEX(@Table,' ',@fillfactor);  38                     END;39                 FETCH NEXT FROM TableCursor INTO @Table;  40             END;  41         CLOSE TableCursor;  42         DEALLOCATE TableCursor;  43         FETCH NEXT FROM DatabaseCursor INTO @Database;  44     END;  45 CLOSE DatabaseCursor;  46 DEALLOCATE DatabaseCursor;