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Sql server 2005 lck_m_sch_s
LCK_M_RX_S, explanation goes here along with steps to troubleshoot.
Think about it from the following prospective you dont want to have 2 sessions altering the table simultaneously.
See Also: Main_Page, performance Tuning, wait Types, this article is the, collaboration of the Month for February 2010.This is a reason why your DDL statement can wait for quite a long time on the system under heavy load.Those locks are kind of shared locks and acquired by DML statements and held for duration of the statement.LCK_M_RS_U, explanation goes here along with steps to troubleshoot.LCK_M_IU, explanation goes here along with steps to troubleshoot.That statement is basically using _tran_locks, dMV I just added a few other things to make it easier to see/understand.
And you dont want the table being dropped when you are selecting data from there.
We did not talk much about schema locks while back when we were discussing locking.
I will show some examples shortly.
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First, lets create the table and populate it with some data.The biggest possible issue with schema modification lock is that its incompatible even with intent locks.And of course partitioning related operation.This lock can be described as super-exclusive lock and its incompatible with any other lock types including intent locks.Lets take a look same scenario as before, but lets run insert statement in the third session.LCK_M_RX_X, explanation goes here along with steps to troubleshoot.And while its running, lets run the statement that shows currently acquired locks (click on the image to open it in the new window).Insert statement is trying to place intent lock (IX) on the table and its incompatible with SCH-M lock.LCK_M_SIX, explanation goes here along with steps to troubleshoot.Objects obj ;ON par.Explanation goes here along with steps to troubleshoot.Kind of interesting situation when select in read uncommitted isolation level blocks insert.If we think about SCH-M locks, they are acquired on the object level deadlock possibilities are endless.Related Reading on SQL Server LCK_M Waits Links go here.