9

I recently lowered the max memory from the default (unlimited) down to 20 GB. Does this erase the oldest queries in the plan cache?

12

Per Microsoft documentation changing the max server memory will clear the plan cache, as will changing:

  • access check cache bucket count
  • access check cache quota
  • clr enabled
  • cost threshold for parallelism
  • cross db ownership chaining
  • index create memory
  • max degree of parallelism
  • max server memory
  • max text repl size
  • max worker threads
  • min memory per query
  • min server memory
  • query governor cost limit
  • query wait
  • remote query timeout
  • user options
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