Programming, SQL Database

Drop and recreate all indexes in database

SQL Server Management Studio does not have an easy way via the wizard to complete these tasks at the same time. In this tip, we look at a creating a script to drop and create all SQL Server indexes for a SQL Server database. Some cases we found indexes, not in a source control system, dropped or corrupted, indexes need to be recreated for another copy of the same database for testing, development or training purposes or there is a need to recreate the indexes on a different FILEGROUP then refer below script in order.

so how to drop and recreate all indexes in the database?

Get the copy of existing indexes as create the script:

SELECT ' CREATE ' +
CASE WHEN I.is_unique = 1 THEN ' UNIQUE ' ELSE '' END +
I.type_desc COLLATE DATABASE_DEFAULT +' INDEX ' +
I.name + ' ON ' +
Schema_name(T.Schema_id)+'.'+T.name + ' ( ' +
KeyColumns + ' ) ' +
ISNULL(' INCLUDE ('+IncludedColumns+' ) ','') +
ISNULL(' WHERE '+I.Filter_definition,'') + ' WITH ( ' +
CASE WHEN I.is_padded = 1 THEN ' PAD_INDEX = ON ' ELSE ' PAD_INDEX = OFF ' END + ',' +
'FILLFACTOR = '+CONVERT(CHAR(5),CASE WHEN I.Fill_factor = 0 THEN 100 ELSE I.Fill_factor END) + ',' +
-- default value
'SORT_IN_TEMPDB = OFF ' + ',' +
CASE WHEN I.ignore_dup_key = 1 THEN ' IGNORE_DUP_KEY = ON ' ELSE ' IGNORE_DUP_KEY = OFF ' END + ',' +
CASE WHEN ST.no_recompute = 0 THEN ' STATISTICS_NORECOMPUTE = OFF ' ELSE ' STATISTICS_NORECOMPUTE = ON ' END + ',' +
-- default value
' DROP_EXISTING = ON ' + ',' +
-- default value
' ONLINE = OFF ' + ',' +
CASE WHEN I.allow_row_locks = 1 THEN ' ALLOW_ROW_LOCKS = ON ' ELSE ' ALLOW_ROW_LOCKS = OFF ' END + ',' +
CASE WHEN I.allow_page_locks = 1 THEN ' ALLOW_PAGE_LOCKS = ON ' ELSE ' ALLOW_PAGE_LOCKS = OFF ' END + ' ) ON [' +
DS.name + ' ] ' [CreateIndexScript]
FROM sys.indexes I
JOIN sys.tables T ON T.Object_id = I.Object_id
JOIN sys.sysindexes SI ON I.Object_id = SI.id AND I.index_id = SI.indid
JOIN (SELECT * FROM (
SELECT IC2.object_id , IC2.index_id ,
STUFF((SELECT ' , ' + C.name + CASE WHEN MAX(CONVERT(INT,IC1.is_descending_key)) = 1 THEN ' DESC ' ELSE ' ASC ' END
FROM sys.index_columns IC1
JOIN Sys.columns C
ON C.object_id = IC1.object_id
AND C.column_id = IC1.column_id
AND IC1.is_included_column = 0
WHERE IC1.object_id = IC2.object_id
AND IC1.index_id = IC2.index_id
GROUP BY IC1.object_id,C.name,index_id
ORDER BY MAX(IC1.key_ordinal)
FOR XML PATH('')), 1, 2, '') KeyColumns
FROM sys.index_columns IC2
--WHERE IC2.Object_id = object_id('Person.Address') --Comment for all tables
GROUP BY IC2.object_id ,IC2.index_id) tmp3 )tmp4
ON I.object_id = tmp4.object_id AND I.Index_id = tmp4.index_id
JOIN sys.stats ST ON ST.object_id = I.object_id AND ST.stats_id = I.index_id
JOIN sys.data_spaces DS ON I.data_space_id=DS.data_space_id
JOIN sys.filegroups FG ON I.data_space_id=FG.data_space_id
LEFT JOIN (SELECT * FROM (
SELECT IC2.object_id , IC2.index_id ,
STUFF((SELECT ' , ' + C.name
FROM sys.index_columns IC1
JOIN Sys.columns C
ON C.object_id = IC1.object_id
AND C.column_id = IC1.column_id
AND IC1.is_included_column = 1
WHERE IC1.object_id = IC2.object_id
AND IC1.index_id = IC2.index_id
GROUP BY IC1.object_id,C.name,index_id
FOR XML PATH('')), 1, 2, '') IncludedColumns
FROM sys.index_columns IC2
--WHERE IC2.Object_id = object_id('Person.Address') --Comment for all tables
GROUP BY IC2.object_id ,IC2.index_id) tmp1
WHERE IncludedColumns IS NOT NULL ) tmp2
ON tmp2.object_id = I.object_id AND tmp2.index_id = I.index_id
WHERE I.is_primary_key = 0 AND I.is_unique_constraint = 0
--AND I.Object_id = object_id('Person.Address') --Comment for all tables
--AND I.name = 'IX_Address_PostalCode' --comment for all indexes 

Drop indexes:

DECLARE @SchemaName VARCHAR(256)
DECLARE @TableName VARCHAR(256)
DECLARE @IndexName VARCHAR(256)
DECLARE @TSQLDropIndex VARCHAR(MAX)

DECLARE CursorIndexes CURSOR FOR
SELECT schema_name(t.schema_id), t.name, i.name
FROM sys.indexes i
INNER JOIN sys.tables t ON t.object_id= i.object_id
WHERE i.type>0 and t.is_ms_shipped=0 and t.name<>'sysdiagrams'
and (is_primary_key=0 and is_unique_constraint=0)

OPEN CursorIndexes
FETCH NEXT FROM CursorIndexes INTO @SchemaName,@TableName,@IndexName

WHILE @@fetch_status = 0
BEGIN
SET @TSQLDropIndex = 'DROP INDEX '+QUOTENAME(@SchemaName)+ '.' + QUOTENAME(@TableName) + '.' +QUOTENAME(@IndexName)
PRINT @TSQLDropIndex
FETCH NEXT FROM CursorIndexes INTO @SchemaName,@TableName,@IndexName
END

CLOSE CursorIndexes
DEALLOCATE CursorIndexes
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