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When to use partition level Lock escalation in SQL Server?
A brief recap – lock escalation in SQL Server 2005 and before only allowed table-level lock escalation. If you have a partitioned table with queries going against different partitions, then table-level escalation is a pain because the whole table is suddenly locked and concurrent queries against distinct partitions can’t run.
How to set Lock escalation in ALTER TABLE?
The lock escalation policy can only be set with ALTER TABLE after a table has been created, and the policy can only be set at the table level. The syntax is. ALTER TABLE TableName SET (LOCK_ESCALATION = TABLE | AUTO | DISABLE); The options mean: TABLE – escalation will always be to the table level. This is the default.
When to use parttition lock in SQL Server 2008?
SQL Server 2008 gives the ability to escalate to a parttition lock, which won’t affect the queries on the other partitions. The lock escalation policy can only be set with ALTER TABLE after a table has been created, and the policy can only be set at the table level. The syntax is TABLE – escalation will always be to the table level.
When to use auto or disable Lock escalation?
The AUTO mode enables lock escalation for partitioned tables only for the locked partition. For non-partitioned tables it works like TABLE. The DISABLE mode removes the lock escalation capability for the table and that is important when concurrency issues are more important than memory needs for specific tables.
How does locking at the partition level improve performance?
Ooh ooh but also! In addition, you can improve performance by enabling lock escalation at the partition level instead of a whole table. This can reduce lock contention on the table.
Is there a way to disable Auto Lock escalation?
DISABLE prevents lock escalation to the entire table in most cases. AUTO allows table locks except if the table is partitioned, in which case locks are only made up to the partition level. See this blog post for more info.