![]() ![]() This is a pain though and has to be done after hours. ![]() ALTER DATABASE DBName SET READCOMMITTEDSNAPSHOT ON I realize that all connections expect the query window need to be issue the command and it returns immediately. SELECT is_read_committed_snapshot_on FROM sys. When issuing the below command on any of our databases, it just hangs forever. Check the status afterwards to make sure it worked Allow connections to be established once again * restricts access to the DB to logins with sysadmin, dbcreator orĪLTER DATABASE AEDB SET RESTRICTED_USER WITH ROLLBACK AFTER 30 SECONDSĪLTER DATABASE AEDB SET READ_COMMITTED_SNAPSHOT ON It assumes the current DB is the one you want to set for snapshot mania and will execute only on SQL 2005 without throwing errors on SQL 2000. * This will roll back any open transactions after 30 seconds and SET READCOMMITTEDSNAPSHOT ON ALTER DATABASE MySite SET READCOMMITTEDSNAPSHOT ON 10 sys. Here’s a script that can do this (using AEDB again as example): - Switch over to master to avoid hanging connection problems Having needed to enable it on an active application with active database connections in the past, I’ve found that option 2 works well as long as you do it during off-hours 0: (default): READCOMMITTEDSNAPSHOT option is OFF. This test was performed on a SQL Server 2019. READCOMMITTEDSNAPSHOT is not enabled, because actually read committed should isolate sufficiently. ![]() You can apply the change and rollback any active transactions at the same time by running: ALTER DATABASE AEDB SET READ_COMMITTED_SNAPSHOT ON WITH ROLLBACK IMMEDIATE Read operations under the READ COMMITTED isolation level is based on snapshot scans and do not acquire locks. Unfortunately, some queries returned values like 48005, which I cant explain, because all connections were in read committed mode. If you explicitly want to read past the lock, use a lower isolation level such as READ UNCOMMITTED, or add an explicit NOLOCK hint. This below article describes different methods to turn this option "on" in SQL Server It can't tell you the count until the commit, because it is ReadCommitted - which means it can only read committed data. ![]()
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