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MSSQLSERVER_802 - Database Engine error

  • Article

Applies to: SQL Server

Details

Attribute Value
Product Name SQL Server
Event ID 802
Event Source MSSQLSERVER
Component SQLEngine
Symbolic Name NO_BUFS
Message Text There is insufficient memory available in the buffer pool.

Note

This article is focused on SQL Server. For information on troubleshooting out of memory issues in Azure SQL Database, see Troubleshoot out of memory errors with Azure SQL Database.

Explanation

This is caused when the buffer pool is full and the buffer pool cannot grow any larger.

User action

The following list outlines general steps that will help in troubleshooting memory errors:

  1. Verify whether other applications or services are consuming memory on this server. Reconfigure less critical applications or services to consume less memory.

  2. Start collecting performance monitor counters for SQL Server: Buffer Manager, SQL Server: Memory Manager.

  3. Check the following SQL Server memory configuration parameters:

    • max server memory

    • min server memory

    • min memory per query

    Notice any unusual settings and correct them as necessary. Account for increased memory requirements for SQL Server. Default settings are listed in Server memory configuration options.

  4. Observe DBCC MEMORYSTATUS output and the way it changes when you see these error messages.

  5. Check the workload (number of concurrent sessions, currently executing queries).

The following actions may make more memory available to SQL Server:

  • If applications besides SQL Server are consuming resources, try stopping these applications or running them on a separate server.

  • If you have configured max server memory, increase its setting. For more information, see Set options manually.

Run the following DBCC commands to free several SQL Server memory caches.

  • DBCC FREESYSTEMCACHE

  • DBCC FREESESSIONCACHE

  • DBCC FREEPROCCACHE

If the problem continues, you will need to investigate further and possibly reduce workload.