" With the NOLOCK hint (or setting the isolation level of the session to READ UNCOMMITTED) you tell SQL Server that you don't expect consistency, so there are no guarantees. Bear in mind though that "inconsistent data" does not only mean that you might see uncommitted changes that were l...
" With the NOLOCK hint (or setting the isolation level of the session to READ UNCOMMITTED) you tell SQL Server that you don't expect consistency, so there are no guarantees. Bear in mind though that "inconsistent data" does not only mean that you might see uncommitted changes that were l...
" With the NOLOCK hint (or setting the isolation level of the session to READ UNCOMMITTED) you tell SQL Server that you don't expect consistency, so there are no guarantees. Bear in mind though that "inconsistent data" does not only mean that you might see uncommitted changes that were l...
NOLOCK is a T-SQL hint (directive) that allows MS SQL Server to ignore the normal locks that are placed and held for a transaction and allows the query to complete without having to wait for the first transaction to finish and therefore release the locks. Using NOLOCK gives a significant...
Can't connect the sql server instance with host name from out side of the server ? can't connect to my server Can't enable Service Broker Can't KILL SessionID Can't start SQL Server Agent service? can/does sql decide to use multiple indexes on the same table reference in a query?
begin tran does the row level lock or table level lock Begin Transaction with If Condition BEGIN TRANSACTION within TRY - CATCH or vice versa Best practice to handle the paging and performance in SQL Stored procedure Best Practice: Use of semi-colon to terminate statements; Best practices in wr...
SQL --Session 1: Add data to the table and leave the transaction openBEGINTRANSACTIONEXECLockTest.AddOrders @OrderCount=10000; And using session 2, query again for the top 3 areas, but this time with theNOLOCKhint. SQL --Session 2: Get the sales grouped by area WITH NOLOCKSELECTTOP(3...
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci) SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability We walk in the dark places no others will enter We stand on the bridge and no one may pass ...
What does begin transaction do in SQL? BEGIN TRANSACTION representsa point at which the data referenced by a connection is logically and physically consistent. If errors are encountered, all data modifications made after the BEGIN TRANSACTION can be rolled back to return the data to this known st...
I was checking the statistics objects in my Microsoft SQL Server database and found some statistics with strange names. Could you please explain what the _WA_Sys… statistics are? Why are they created? Can I safely delete them? Do they differ from the other statistics objects? Check out thi...