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SQL Server 2008
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SQL Server 2008 Administration
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Could nested loops cause the growth in...
Could nested loops cause the growth in tempdb?
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Golfer22
Golfer22
Posted Tuesday, January 01, 2013 9:39 PM
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I believe hash joins can cause growth in the tempdb if there is insufficient memory. I don't think nested loops do.
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Bhuvnesh
Bhuvnesh
Posted Wednesday, January 02, 2013 12:06 AM
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If you go with the basic structure of HASH join then you will find that temp table get created (either in memory or tempdb) which might the cause of tempdb's growth. so now why i mentioned here "either in memory or tempdb" because if data doesnt get fit in memory then it will be moved to tempdb. same happens in case of temp table and table variable storage too(its a myth that table varable get created in memory and temp table in tempdb).
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Post #1401674
opc.three
opc.three
Posted Wednesday, January 02, 2013 10:16 AM
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Golfer22 (1/1/2013)
I believe hash joins can cause growth in the tempdb if there is insufficient memory. I don't think nested loops do.
No, I do not think nested loops would affect tempdb.
__________________________________________________________________________________________________
There are no special teachers of virtue, because virtue is taught by the whole community.
--Plato
Believe you can and you're halfway there.
--Theodore Roosevelt
Everything Should Be Made as Simple as Possible, But Not Simpler
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The significant problems we face cannot be solved at the same level of thinking we were at when we created them.
--Albert Einstein
1 apple is not exactly 1/8 of 8 apples. Because there are no absolutely identical apples.
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Post #1401949
opc.three
opc.three
Posted Wednesday, January 02, 2013 10:17 AM
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Bhuvnesh (1/2/2013)
If you go with the basic structure of HASH join then you will find that
temp table get created
(either in memory or tempdb) which might the cause of tempdb's growth. so now why i mentioned here "either in memory or tempdb" because if data doesnt get fit in memory then it will be moved to tempdb. same happens in case of temp table and table variable storage too(its a myth that table varable get created in memory and temp table in tempdb).
I think you meant
internal work table
, aka the hash table.
Temp table
implies we could address it using #tableName. Internal work tables are created by the database engine to solve a particular query and are not directly addressable by us.
__________________________________________________________________________________________________
There are no special teachers of virtue, because virtue is taught by the whole community.
--Plato
Believe you can and you're halfway there.
--Theodore Roosevelt
Everything Should Be Made as Simple as Possible, But Not Simpler
--Albert Einstein
The significant problems we face cannot be solved at the same level of thinking we were at when we created them.
--Albert Einstein
1 apple is not exactly 1/8 of 8 apples. Because there are no absolutely identical apples.
--Giordy
Post #1401950
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