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krish_mrt
New User
Joined: 15 Apr 2005
Posts: 12
Location: Chennai
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| Code: |
UPDATE TAB1
SET COL1 = (SELECT TAB2.COL1
FROM TAB2
WHERE TAB2.COL2 = 'XX'); |
In the code above, I would like to know the kind of locks applied on the tables TAB1 and TAB2.
And... I would also like to know what would be the effect on the update statement on specifying the clause- "WITH UR"
in the update statement as ...
| Code: |
UPDATE TAB1
SET COL1 = ( SELECT TAB2.COL1
FROM TAB2
WHERE TAB2.COL2 = 'XX')
WITH UR; |
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Gurmeet
New User
Joined: 22 Feb 2006
Posts: 46
Location: Pune
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[quote=
And... I would also like to know what would be the effect on the update statement on specifying the clause- "WITH UR"
in the update statement as ...
| Code: |
UPDATE TAB1
SET COL1 = ( SELECT TAB2.COL1
FROM TAB2
WHERE TAB2.COL2 = 'XX')
WITH UR; |
[/quote]
WITH UR is not allowed with a update clause... |
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die7nadal
Active User
Joined: 23 Mar 2005
Posts: 156
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I am answering this from the top of my head. Generally locks are defined when they define a Table space.
So for your first question, it depends upon the TS the Tables are present in.
For the 2nd question, Gurmeet is right, u will get an SQL Code, u cannot update a table with UR. |
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sumasudesh
New User
Joined: 25 May 2006
Posts: 1
Location: singapore
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| In DB2, I just want to know that how can I apply lock when selecting a SINGLE ROW? (ROW-LEVEL) |
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hikaps14
Active User
Joined: 02 Sep 2005
Posts: 189
Location: Noida
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Hi,
i guess u r talking of four lock levels in db2 .
RR - REPEATABLE READ (locks whole db2 object u r accessing )
RS - READ STABILITY ( locks only rows or pages u scanned )
CS - CURSOR STABILITY (locks current row u r accessing )
UR - UNCOMITTED READ
in ur case use 'CS' for row level locking while scanning
i hope this fulfills ur question
Thanks ,
-Kapil . |
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