Merge pull request #337 from HannahIgboke/main

SQL-415: Rebuilding All Indexes in a SQL Database

Author: milos-simic

sql-queries-index/index-rebuild/automate_index_rebuild.sql

@@ -0,0 +1,24 @@
+USE University;
+GO
+
+DECLARE @TableName NVARCHAR(255);
+DECLARE @SQL NVARCHAR(MAX);
+
+DECLARE table_cursor CURSOR FOR
+SELECT QUOTENAME(SCHEMA_NAME(t.schema_id)) + '.' + QUOTENAME(t.name)
+FROM sys.tables t
+WHERE t.is_ms_shipped = 0;
+
+OPEN table_cursor;
+FETCH NEXT FROM table_cursor INTO @TableName;
+
+WHILE @@FETCH_STATUS = 0
+BEGIN
+    SET @SQL = 'ALTER INDEX ALL ON ' + @TableName + ' REBUILD WITH (FILLFACTOR = 90, SORT_IN_TEMPDB = ON);';
+    PRINT 'Rebuilding indexes on: ' + @TableName;
+    EXEC sp_executesql @SQL;
+    FETCH NEXT FROM table_cursor INTO @TableName;
+END;
+
+CLOSE table_cursor;
+DEALLOCATE table_cursor;

sql-queries-index/index-rebuild/calculate-fragmentation_percent.sql

@@ -0,0 +1,12 @@
+USE University; 
+GO 
+  SELECT t.name AS Table_name, 
+         i.name AS Index_name, 
+         ps.avg_fragmentation_in_percent 
+  FROM sys.dm_db_index_physical_stats(DB_ID(), NULL, NULL, NULL, 'LIMITED') AS ps 
+  INNER JOIN sys.indexes i 
+  ON ps.object_id = i.object_id AND ps.index_id = i.index_id 
+  INNER JOIN sys.tables t 
+  ON i.object_id = t.object_id 
+  WHERE i.type_desc IN ('CLUSTERED', 'NONCLUSTERED') AND ps.database_id = DB_ID() 
+  ORDER BY ps.avg_fragmentation_in_percent DESC;

sql-queries-index/index-rebuild/creating_db_role.sql

@@ -0,0 +1,12 @@
+IF NOT EXISTS ( 
+    SELECT 1 
+    FROM sys.database_principals 
+    WHERE name = 'index_maintenance' AND type = 'R' 
+) 
+BEGIN 
+  CREATE ROLE index_maintenance; 
+END 
+GO 
+
+GRANT ALTER ON OBJECT::dbo.Teaching TO index_maintenance; 
+GO

sql-queries-index/index-rebuild/db_database.sql

@@ -0,0 +1,7 @@
+BACKUP DATABASE University 
+TO DISK = 'C:\Backups\University_FULL.bak' 
+WITH FORMAT, 
+      INIT, 
+      NAME = 'Full Backup Before Index Rebuild', 
+      SKIP, 
+      STATS = 10;

sql-queries-index/index-rebuild/rebuild_all_index_in_db.sql

@@ -0,0 +1,33 @@
+USE University;
+GO
+
+DECLARE @TableName NVARCHAR(255);
+DECLARE @IndexName NVARCHAR(255);
+DECLARE @SQL NVARCHAR(MAX);
+
+DECLARE frag_cursor CURSOR FOR
+SELECT 
+    QUOTENAME(SCHEMA_NAME(t.schema_id)) + '.' + QUOTENAME(t.name),
+    QUOTENAME(i.name)
+FROM 
+    sys.dm_db_index_physical_stats(DB_ID(), NULL, NULL, NULL, 'LIMITED') AS ps
+JOIN sys.indexes i ON ps.object_id = i.object_id AND ps.index_id = i.index_id
+JOIN sys.tables t ON i.object_id = t.object_id
+WHERE 
+    ps.avg_fragmentation_in_percent > 30
+    AND i.type_desc IN ('CLUSTERED', 'NONCLUSTERED');
+
+OPEN frag_cursor;
+FETCH NEXT FROM frag_cursor INTO @TableName, @IndexName;
+
+WHILE @@FETCH_STATUS = 0
+BEGIN
+    SET @SQL = 'ALTER INDEX ' + @IndexName + ' ON ' + @TableName + ' REBUILD WITH (FILLFACTOR = 90, SORT_IN_TEMPDB = ON);';
+    PRINT 'Rebuilding index: ' + @IndexName + ' on table: ' + @TableName;
+    EXEC sp_executesql @SQL;
+
+    FETCH NEXT FROM frag_cursor INTO @TableName, @IndexName;
+END;
+
+CLOSE frag_cursor;
+DEALLOCATE frag_cursor;

sql-queries-index/index-rebuild/rebuild_index_on_table.sql

@@ -0,0 +1,6 @@
+ALTER INDEX [PK__Teaching__3213E83FFA8FEA28] 
+ON dbo.Teaching 
+REBUILD WITH ( 
+    FILLFACTOR = 90, 
+    SORT_IN_TEMPDB = ON, 
+    STATISTICS_NORECOMPUTE = OFF);