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SQL Server 2008
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rebuilding indexes
rebuilding indexes
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Lexa
Lexa
Posted Tuesday, September 25, 2012 2:22 PM
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1. Does index rebuild on a partitioned aligned index for an individual partition causes any locks on other partitions?
2. Does REORGANIZE on a table causes any locks?
Thanks
Post #1364283
Evil Kraig F
Evil Kraig F
Posted Tuesday, September 25, 2012 5:14 PM
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Lexa (9/25/2012)
2. Does REORGANIZE on a table causes any locks?
Can't answer #1, not sure.
Reorganize will take a SCH-S lock to keep the metadata straight. It will also take S locks on the data as it processes, and should take an IX lock at the table level to keep anything from escalating to table level, but I'm not sure about that last one. Shouldn't be too hard to test but I don't have anything right now with large enough data that I can 'catch it' in stream to directly test.
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Post #1364360
Lexa
Lexa
Posted Thursday, September 27, 2012 3:55 PM
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Last Login: Monday, June 10, 2013 11:23 AM
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Evil Kraig F (9/25/2012)
Lexa (9/25/2012)
2. Does REORGANIZE on a table causes any locks?
Can't answer #1, not sure.
Reorganize will take a SCH-S lock to keep the metadata straight. It will also take S locks on the data as it processes, and should take an IX lock at the table level to keep anything from escalating to table level, but I'm not sure about that last one. Shouldn't be too hard to test but I don't have anything right now with large enough data that I can 'catch it' in stream to directly test.
Ignite shows that a rebuild of an index on a partition caused blocking on inserts into that same table but another, "active" partition. Locks were LCK_M_IX on the insert stmts and LCK_M_SCH_M on the ALTER INDEX REBUILD PARTITION XXX. Is that possible? Can a rebuild on one partition cause blocking on another?
Post #1365546
Lexa
Lexa
Posted Friday, September 28, 2012 7:34 AM
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Group: General Forum Members
Last Login: Monday, June 10, 2013 11:23 AM
Points: 158,
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Lexa (9/27/2012)
Evil Kraig F (9/25/2012)
Lexa (9/25/2012)
2. Does REORGANIZE on a table causes any locks?
Can't answer #1, not sure.
Reorganize will take a SCH-S lock to keep the metadata straight. It will also take S locks on the data as it processes, and should take an IX lock at the table level to keep anything from escalating to table level, but I'm not sure about that last one. Shouldn't be too hard to test but I don't have anything right now with large enough data that I can 'catch it' in stream to directly test.
Ignite shows that a rebuild of an index on a partition caused blocking on inserts into that same table but another, "active" partition. Locks were LCK_M_IX on the insert stmts and LCK_M_SCH_M on the ALTER INDEX REBUILD PARTITION XXX. Is that possible? Can a rebuild on one partition cause blocking on another?
Has anyone experienced a similar issue?
Post #1365865
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