Tagged Questions

7
votes
2answers
323 views

Updating a table with more than 850 million rows of data

I have been tasked with writing an update query to update a table with more than 850 million rows of data. Here are the table structures: Source Tables : CREATE TABLE [dbo].[SourceTable1]( ...
6
votes
1answer
154 views

UNIQUE index key violation

I have a table with a PK and a unique non-clustered index, as follows: CREATE TABLE Table1 ( Id INT IDENTITY(1,1) NOT NULL, Field1 VARCHAR(25) NOT NULL, Field2 VARCHAR(25) NULL, ...
3
votes
1answer
267 views

How to force the use of row locks?

I am trying to get my table to use row locks. I have already disabled lock escalation. The isolation level is READ_COMMITTED_SNAPSHOT alter table <TABLE_NAME> SET (LOCK_ESCALATION=DISABLE) go ...
1
vote
1answer
590 views

Can operations in a loop cause table locks?

I know a bit about locking etc, that when a transaction is working on a table, if it is altering a certain amount of data it might try and lock the entire table (I'm sure that is over simplified, but ...
1
vote
1answer
62 views

Reading and writing the common data

I have a couple tables and application service that intensively inserts, updates its. From the other hand some client application have to read data using those tables. Sometimes client application ...
2
votes
2answers
860 views

SET LOCK_TIMEOUT, is it session or statement based?

For what period does the LOCK_TIMEOUT LAST? I do a "SET LOCK_TIMEOUT 10" and a "SELECT @@LOCK_TIMEOUT" in one command after a login and get 10 returned. Immediately after this I do a "SELECT ...
2
votes
2answers
4k views

SQL Server Transaction Timeout

Is there a way in SQL Server 2008 R2 to cause a timeout for a database modification involving a transaction? We have a scenario where our application code hangs or throws an exception and fails to ...
15
votes
3answers
2k views

Adding columns to production tables

What's the best way to add columns to large production tables on SQL Server 2008 R2? According to Microsoft's books online: The changes specified in ALTER TABLE are implemented immediately. If the ...