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What is parallel redo task?
PARALLEL_REDO_TRAN_TURN. Occurs when a parallel redo worker thread needs to wait for a dependent transaction log be redone before starting to redo the current transaction log. The dependent transaction log may be assigned to a different parallel redo worker, which means a cross-thread wait.
What is parallel redo is shutdown for database?
It’s because the databases aren’t participating in an Availability Group. When a database starts up, the parallel redo threads for that database start, then realize there is no availability group, then shut down.
What is parallel redo sql server?
Starting in SQL Server 2016, parallel thread for redo operations is used in secondary replicas. In this case, heap tables redo operation may generate a runtime assert dump or the SQL Server may crash with an access violation error in some cases.
Which are the uses of OMF?
Oracle Managed Files (OMF)
- Automatic cleanup of the filesystem when database objects are dropped.
- Standardised naming of database files.
- Increased portability since file specifications are not needed.
- Simplified creation of test systems on differing operating systems.
- No unused files wasting disk space.
When does parallel redo start for a database?
Starting up database ‘Database’. Parallel redo is started for database ‘Database’ with worker pool size [1]. Parallel redo is shutdown for database ‘Database’ with worker pool size [1].
When is parallel redo shutdown in SQL Server?
Starting up database ‘Database’. Parallel redo is started for database ‘Database’ with worker pool size [1]. Parallel redo is shutdown for database ‘Database’ with worker pool size [1]. These messages happen at the same time, and repeat continuously every second.
Why is my parallel redo waiting for work?
This wait type is when one of the parallel threads performing redo for an Availability Group replica is waiting for some work to do. This commonly occurs because there is actually no log being generated on the primary replica, but could also (rarely) be because the main parallel redo thread cannot dispatch log records…
Why do parallel redo threads start and stop?
The behavior you’re seeing (where redo starts and immediately stops) is normal. It’s because the databases aren’t participating in an Availability Group. When a database starts up, the parallel redo threads for that database start, then realize there is no availability group, then shut down.