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Tag: Concurrency

  • Transaction Types

    This post is just a quick reference post that outlines the three different types of transaction in Microsoft SQL Server. AutoCommit The default. Each statement in a batch works as though it had been individually wrapped in BEGIN TRAN / COMMIT so the following code block: is effectively the same as: This moves us nicely…

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  • SQL Server Version Store Growing

    SQL Server Version Store Growing

    Enabling Read Committed Snapshot Isolation (RCSI) or snapshot isolation on a database changes the locking behaviour from that of SQL Server’s default, Read Committed isolation. With RCSI or Snapshot Isolation enabled, readers no longer block writers and vice versa, though writers can still block writers. This is implemented by creating and using a version store…

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  • Triggers use the version store

    Triggers use the version store

    Here’s one I stumbled across recently – I was monitoring tempdb space and could see some version store usage on a database that did not have snapshot or Read Committed Snapshot Isolation enabled, I was puzzled by this, but eventually found the answer. What is the Version Store? As a quick primer, the version store…

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