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Is the auto update statistics async option disabled?
This option is set database by database and the default setting for this option is disabled. When this option is enabled, the Query Optimizer will not wait for the update of statistics, but will run the query first and update the outdated statistics afterwards.
Is there a way to turn on auto update statistics?
DATABASEPROPERTYEX is available only for not async statistics (if i correctly understand) Is there a way to receive current DB name in the same statement or other way to turn on auto_update_statistics_async option? This is only supported in SQL Azure V12. Looks like your server is running in SQL Azure V11.
How are Statistics updated in SQL Server async?
New behavior is enabled with the ASYNC_STATS_UPDATE_WAIT_AT_LOW_PRIORITY database-scoped configuration . By default, the SQL Server database engine updates statistics automatically as needed to reflect changes in the underlying data, and help the query optimizer generate more optimal plans.
Is there a problem with asynchronous statistics update?
While asynchronous statistics update eliminates occasional spikes in query duration due to statistics update, it can sometimes cause a different, concurrency-related, problem, particularly for workloads where query plans are frequently compiled or recompiled. The mechanism in play here is non-trivial, and deserves a closer look.
How to delete system jobs in asynchronous plug-in?
You can delete system jobs in the application or in code just like any other table if you have the necessary privileges to do so. When registering asynchronous plug-ins, there is an option to automatically delete successful operations. It is recommended that you use it. More information: Write a plug-in
When to use asynchronous Statistics in SQL Server?
Asynchronous statistics can be beneficial if the statistics update requires a significant amount of time and your queries cannot wait for it to complete. You can get more predictable query response times with asynchronous statistics updates if your SQL Server frequently executes the same query or similar cached query plans.
How is the execution of an asynchronous operation tracked?
The system job defines and tracks the execution of the asynchronous operation. As resources become available system jobs are processed and the operations they define are executed. Any data operations defined in the extension will again be processed by the event execution pipeline, but this time as a synchronous operation.