SQL Server - Defragmenting Table Indexes in SQL Server

Defragmenting Table Indexes in SQL Server

Q

How To Defragment Table Indexes in SQL Server?

✍: FYIcenter.com

A

When a table index is fragmented to a certain percentage, you need to defragment the index to maintain its performance level. There are 3 ways to defragment:

1. "ALTER INDEX index_name ON table_name REORGANIZE" - Defragmenting the specified index performed in online mode. No locks applied on affected table. Used for indexes with a small fragmentation percentage.

2. "ALTER INDEX index_name ON table_name REBUILD" - Defragmenting the specified index performed in offline mode by default. It can be performed in online mode. Used for indexes with a large fragmentation percentage.

3. "CREATE INDEX ... WITH (DROP_EXISTING = ON)" - Re-creating the specified index. The definition of the index can be changed.

⇒Understanding and Managing Indexes in SQL Server

⇒⇒SQL Server Database Tutorials

2016-11-08, 611👍, 0💬

"ALTER INDEX ... REBUILD" - Defragmenting Indexes in SQL Server
How To Rebuild Indexes with ALTER INDEX ... REBUILD in SQL Server? When an index is defragmented to a large percentage, like > 30%, you can use the "ALTER INDEX ... REBUILD" statement to rebuild the index. Here is a tutorial exercise on rebuilding indexes: USE FyiCenterData; GO UPDATE fyi_lin... 2016-11-08, 909👍, 0💬

"ALTER INDEX ... REORGANIZE" - Defragmenting Indexes in SQL Server
How To Defragment Indexes with ALTER INDEX ... REORGANIZE in SQL Server? When an index is defragmented to a small percentage, like < 30%, you can use the "ALTER INDEX ... REORGANIZE" statement to defragment the index. Here is a tutorial exercise on defragmenting indexes: USE FyiCenterData; GO... 2016-11-08, 750👍, 0💬

What Is Index Fragmentation in SQL Server
What Is Index Fragmentation in SQL Server? Index fragmentation is a phenomena where index contents are no longer stored continuously in the storage. When index contents become scattered in the storage, fragmented, performance on index will degrade. If you want to see the fragmentation level of an in... 2016-11-08, 702👍, 0💬

Defragmenting Table Indexes in SQL Server
How To Defragment Table Indexes in SQL Server? When a table index is fragmented to a certain percentage, you need to defragment the index to maintain its performance level. There are 3 ways to defragment: 1. "ALTER INDEX index_name ON table_name REORGANIZE" - Defragmenting the specified index perfor... 2016-11-08, 612👍, 0💬

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