Watch Named, Nested Transactions

Gail Shaw finishes her outstanding series on transactions:

The error was thrown by the ROLLBACK statement. As such, the transaction is still open, the locks are held and the transaction log space can’t be reused. Unless the application that called this was checking for open transactions, that transaction could potentially be left open for quite some amount of time, causing blocking and/or the transaction log to grow.

It’s not just that someone in the future might call the code from another stored proc within a transaction, it’s also that it might be that the code is called from an application which started a transaction. Or called from SSIS which started a transaction. It’s very hard to ensure that code is never called from within an existing transaction

Read the whole thing.

Related Posts

New(ish) VLF Status: 4

Paul Randal points out a new VLF status which can appear if you’re using an Availability Group: At least since I started working on the SQL Server team (just after 7.0 shipped) and since then there have only been two VLF status codes: 0 = the VLF is not active (i.e. it can be (re)activated […]

Read More

The Problems With NOLOCK

Rob Farley demonstrates the downside of the READ UNCOMMITTED isolation level: I’m going to create a table and insert exactly 1 million rows. This particular table will be a clustered index, and will contain 1 million GUIDs. 1 2 CREATE TABLE dbo.demoNOLOCK (someguid uniqueidentifier NOT NULL PRIMARY KEY); INSERT dbo.demoNOLOCK (someguid) SELECT TOP (1000000) NEWID() […]

Read More

Categories

December 2015
MTWTFSS
« Nov Jan »
 123456
78910111213
14151617181920
21222324252627
28293031