Top 10 SQL server Performance tuning tips - 9

Friday, 11 September 2009

Use of NOLOCK hint

NOLOCK hint is useful to improve the query performance when selecting the rowset from a table which is being accessed by multiple transaction.But this leads to dirty read.A dirty read is where a query reads data from the database without lock protection. Without lock protection, you cannot be guaranteed that the data isn’t changing during the time that the query is running.

3 comments:

SQL 2005 Tips said...

Thank you for your information.

Sudhir Chekuri said...

very nice post

dbakings

Unknown said...

Nice post very helpful

dbakings