Database Index Size

Note: Column with varchar(max) column type will take up a lot of space and take longer to create. More columns the index cover (include), the more index space it will take up. The Non-cluster Index can use up as much space as Clustered Index if the Non-cluster index includes all the columns in the table.... » read more


Issue: Single row delete should not take 2 minutes to complete Cause: Looking at execution plan, a lot of processing on a different table with foreign key link to updating table. Foreign keys are constraints in the database to ensure that data values used in child table entry are present in a parent, reference table.... » read more

How to bring reverting/in recovery secondary db back online after failover

Issue: Secondary Database stuck in “Reverting/In Recovery” after Failover. Resolution: The only way to fix is by restarting the secondary machine, it then will kill the system process which was locking the master db.  Sources:

Database stuck “In Recovery” mode and database is not in a state that allows access checks

Error: Getting the following error when trying to bring the database back online. User does not have permission to alter database 'xxxxxx', the database does not exist, or the database is not in a state that allows access checks. -- Database is "RECOVERING" user_access_desc is_read_only state_desc is_in_standby MULTI_USER 0 RECOVERING 0 Resolution: Wait for database... » read more

With Index

Usually the DB engine should automatically select the index to use based on query execution plans it builds. However, there are some pretty rare cases when you want to force the DB to use a specific index.

SET LOCK_TIMEOUT Specifies the number of milliseconds a statement waits for a lock to be released.