Viewing 15 posts - 49,201 through 49,215 (of 49,552 total)
I would suggest NOLOCK as a last resort. Look at optimising your select as much as possible to get it running faster, also look at optimising the update. Firstly you...
Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability
February 20, 2006 at 10:42 pm
Yes it can. As that piece from books online stated, a select takes shared locks for the duration of it's execution. A shared lock means that while other reads can...
Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability
February 20, 2006 at 1:58 am
Thanks Todd. I noticed the E-Learning. How long does it take? I was considering taking it during lunch breaks next week.
I've got a lot of experience with 2000, and have...
Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability
February 14, 2006 at 12:35 pm
There's not that much difference between a cursor that processes a set of records one by one and a while loop that processes a set of records one by one....
Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability
February 13, 2006 at 1:26 pm
Can you give an example of @sql_string?
There is an error avoidence technique that you could use:
IF EXISTS (SELECT 1 FROM sysobjects WHERE name='TableToBeDropped')
DROP TABLE TableToBeDropped
Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability
February 9, 2006 at 11:22 pm
Yes, but it will require a subquery to do the calculation
SELECT PRODUCTS.PRODUCT_ID, PRODUCTS.P_NAME, VOTES.V_SCORE
FROM [PRODUCTS]
LEFT JOIN [VOTES]
ON VOTES.PRODUCT_ID = PRODUCTS.PRODUCT_ID AND
VOTES.USER_ID = 3
LEFT OUTER JOIN (SELECT Product_ID,...
Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability
February 9, 2006 at 12:56 am
I'm not a fan of dynamic SQL, but this is a place where it will help.
DECLARE @DBName varchar(20)
SET @DBName = 'msdb'
DECLARE @sSQL VARCHAR(500)
SET @sSQL = 'SELECT name, filename FROM '...
Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability
February 8, 2006 at 4:10 am
I mostly agree with Marco. Here's a suggested rewrite
SELECT Table01.field01, Table01.field02, Table01.field03, Table01.field04, Table01.field05
FROM Table01 LEFT OUTER JOIN Table02 ON Table01.field03 = Table02.field03
LEFT OUTER JOIN Table03 ON Table01.field03 = Table03.field03
WHERE...
Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability
February 8, 2006 at 2:39 am
You can change TempDB's collation by changing the colation of then entire server. That will involve rebuilding the master database with the new collation. Look up Rebuildm in books online.
If you are...
Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability
February 7, 2006 at 2:48 am
How about building up an insert/update statement as a string then executing it after the rollback. Something like this
BEGIN TRANSACTION
Insert into VeryImportantTable (...) values (...)
IF @@Error!=0
BEGIN
DECLARE @sSQL VARCHAR(1000)
SET @sSQL =...
Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability
February 6, 2006 at 1:30 am
Yes you can. You can't trap the ones above 20, but those are written into the error log. 11 through 19 are standard errors, less than 11 are warnings or...
Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability
February 5, 2006 at 10:50 pm
Correction. TRY...CATCH only catch errors with severity>10 (anything less than that is a warning or information message and not an error) and will only catch errors that don't close the...
Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability
February 3, 2006 at 12:30 am
Ah, then you should be able to get what you want in Table3 with a single insert, no need for a seperate update after.
INSERT INTO Table3(custID, DOB_Min, DOB_Max)
SELECT Table1.CustID, MIN(Table2.DOB),...
Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability
February 2, 2006 at 5:12 am
You can do it in one step(if you had custID in table 2 that is)
Insert into Table3 (CustID, DOB_Min, DOB_Max)
SELECT CustID, MIN(C_DOB), MAX(C_DOB) FROM Table2 GROUP BY CustID
How do table1...
Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability
February 2, 2006 at 4:21 am
<sarcasm>Well excuse me for trying to help</sarcasm>
Just offerng an additional possibility that doesn't require adding an additional parameter to the procedure to deal with the output of substring.
Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability
February 2, 2006 at 4:15 am
Viewing 15 posts - 49,201 through 49,215 (of 49,552 total)