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MSSQLSERVER_8623

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Applies to: SQL Server

Details

Attribute Value
Product Name SQL Server
Event ID 8623
Event Source MSSQLSERVER
Component SQLEngine
Symbolic Name OPTIMIZER_NOPLAN_ERR
Message Text The query processor ran out of internal resources and could not produce a query plan. This is a rare event and only expected for extremely complex queries or queries that reference a very large number of tables or partitions. Please simplify the query. If you believe you've received this message in error, contact Customer Support Services for more information.

Explanation

The Query Optimizer is unable to generate a query plan due to either running out of resources or the query being too complex, two different states can be returned for this error

  • State 1 - The query timed out due to the plan being too complex
  • State 2 - The query ran out of resources - Memory

User Action

Simplify the query by breaking the query into multiple queries along the largest dimension. First, remove any query elements that aren't necessary, then try adding a temp table and splitting the query in two. Note that if you move a part of the query to a subquery, function, or a common table expression that isn't sufficient because they get recombined into a single query by the compiler. You can also, try adding hints to force a plan earlier, for example OPTION (FORCE ORDER).