Indicates SQL Server is waiting for a log buffer to write log blocks for a transaction. Log buffers often deplete when a lot of small transactions (implicit or explicit) are happening very frequently

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DBAs and Developers

Suggested solutions

  1. Remove cursor or iterative procedures making many small changes. Replace these with batch modifications
  2. See if the database setting Delayed Durability is suitable for the database system
  3. Disable any unused indexes. This will decrease the number writes during data modifications
  4. Ensure that index fill factors are set appropriately to avoid page splits. Indexes that are frequently changing should have a lower fill factor

Additional research

Delayed Durability in SQL Server 2014
Diagnosing Transaction Log Performance Issues and Limits of the Log Manager
What is the WRITELOG wait type

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