What is DBCC Showcontig?

The DBCC SHOWCONTIG statement traverses the page chain at the leaf level of the specified index when index_id is specified. If only table_id is specified or if index_id is 0, the data pages of the specified table are scanned.

What is dm_ db_ index_ physical_ stats?

dm_db_index_physical_stats(@db_id, @object_id, NULL, NULL , ‘DETAILED’) AS IPS; END GO. Returned Column. Description. avg_fragmentation_in_percent. It indicates the amount of external fragmentation you have for the given objects.

What is Avg_fragmentation_in_percent?

avg_fragmentation_in_percent: This is a percentage value that represents external fragmentation. For a clustered table and leaf level of index pages, this is Logical fragmentation, while for heap, this is Extent fragmentation. The lower this value, the better it is.

What is scan density in SQL Server?

Scan Density [Best Count: Actual Count] It is the ratio Best Count to Actual Count. This value is 100 if everything is contiguous; if this value is less than 100, some fragmentation exists. Best Count is the ideal number of extent changes if everything is contiguously linked.

How do I reindex a SQL database?

You can think of it as the master index for that table if it helps.

1. Right click on an index and go to Properties.
2. Select Fragmentation from the Select a page window.
3. Click out of that window and right click on your index again.
4. Click Okay and the window and your Index will be rebuilt.
5. Rebuild All Indexes in a Table.

How can I see all indexes in SQL Server?

You can use the sp_helpindex to view all the indexes of one table. And for all the indexes, you can traverse sys. objects to get all the indexes for each table. Only problem with this is that it only includes the index key columns, not the included columns.

What is Sp_updatestats?

sp_updatestats executes UPDATE STATISTICS , by specifying the ALL keyword, on all user-defined and internal tables in the database. sp_updatestats displays messages that indicate its progress. When the update is completed, it reports that statistics have been updated for all tables.

Is index fragmentation bad?

Index fragmentation is bad on traditional, spinning disk drives because the read head has to dance all around to gather the scattered data, slowing everything down. With solid state drives there are no moving parts and thus access is much, much faster.