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 Transact-SQL (2008)
 Transaction with no read lock
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Kimi86
Yak Posting Veteran

79 Posts

Posted - 08/20/2014 :  13:13:45  Show Profile  Reply with Quote
I have a code that does something like below

Begin transaction

Insert into Table A
Select * from Table 8

Commit Transaction

Now during the time the insert takes place the tables get lock and cant be even read..
Is there a way to be able to at least read the data in table B when the query is running


Thanks

tkizer
Almighty SQL Goddess

USA
38200 Posts

Posted - 08/20/2014 :  13:45:57  Show Profile  Visit tkizer's Homepage  Reply with Quote
You should look into RCSI isolation level. You could use the nolock hint, however the insert/select could get bad data due to the dirty reads.

Tara Kizer
SQL Server MVP since 2007
http://weblogs.sqlteam.com/tarad/

Edited by - tkizer on 08/20/2014 13:46:16
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Kimi86
Yak Posting Veteran

79 Posts

Posted - 08/20/2014 :  15:08:49  Show Profile  Reply with Quote
There is no process that could read or write into Table A during the transaction . Also there could be no process that could write data into Table B during the transaction. I could only have reads for table B while transaction runs.. Also I cannot go and change the read process because and apply nowait there.. So is there a way i could run this transaction in a way that the read on table B remains unlocked
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tkizer
Almighty SQL Goddess

USA
38200 Posts

Posted - 08/20/2014 :  15:37:42  Show Profile  Visit tkizer's Homepage  Reply with Quote
Use the nolock hint on TableB for your insert/select.

Tara Kizer
SQL Server MVP since 2007
http://weblogs.sqlteam.com/tarad/
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