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  1. MariaDB Server
  2. MDEV-24117

Memory management problem in statistics state for queries that have a large field IN (values) part

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    Description

      A query with a large IN () section will be stuck in statistics and use up all RAM. Multiple such queries will crash the server regardless of memory limitations specified in my.cnf

      I noticed this in 10.2.35. Downgrading to 10.2.34 fixes the problem

      An example is the WordPress "select post_id,meta_value from wp_postmeta where meta_id in (1,2,3 etc ...)" query.

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          is blocked by

          Bug - A problem which impairs or prevents the functions of the product. MDEV-27380 After minor upgrade to 10.5.13 queries with large IN clauses have performance issues

          • Critical - Crashes, loss of data, severe memory leak.
          • Closed
          is caused by

          Bug - A problem which impairs or prevents the functions of the product. MDEV-23811 With large number of indexes optimizer chooses an inefficient plan

          • Major - Major loss of function.
          • Closed
          is duplicated by

          Bug - A problem which impairs or prevents the functions of the product. MDEV-24163 Mariadb is restarting after sending this message [Warning] Aborted connection 5889 to db: 'xxxx' user: 'xxxxx' host:

          • Minor - Minor loss of function, or other problem where easy workaround is present.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-24173 After minor upgrade to 10.2.35 queries with large IN clauses have performance issues

          • Major - Major loss of function.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-24195 Huge memory usage after upgrade

          • Blocker - Blocks development and/or testing work, production could not run.
          • Closed

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              psergei Sergei Petrunia
              glucz Geza Lucz
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