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  1. MariaDB Server
  2. MDEV-20609

Full table scan in INFORMATION_SCHEMA.PARAMETERS/ROUTINES

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    Description

      It seems there is an issue when querying on I_S.PARAMETERS table (used in java metadata) :
      when doing this kind of query (one result) :
      SELECT * FROM INFORMATION_SCHEMA.PARAMETERS WHERE SPECIFIC_SCHEMA = 'testj' AND SPECIFIC_NAME = 'p2_512'
      It takes 15ms if 400 parameters in I_S.PARAMETERS table
      It takes 65ms if 4K parameters
      It takes 350ms if 20K parameters

      It seems to execute a full table scan in INFORMATION_SCHEMA.PARAMETERS

      The same query takes 6ms on mysql 8 with 20K same parameters

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        Issue Links

          causes

          Bug - A problem which impairs or prevents the functions of the product. CONJ-684 Performance of con.getMetaData().getProcedureColumns(null, null, name, "%") is much lower than mysql jdbc

          • Major - Major loss of function.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. MDEV-29550 Valgrind/MSAN uninitialised value errors upon SHOW PROCEDURE STATUS with condition on Db

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

          Bug - A problem which impairs or prevents the functions of the product. MDEV-29858 Missing DBUG_RETURN or DBUG_VOID_RETURN macro in function "fill_schema_proc"

          • Major - Major loss of function.
          • Closed
          is part of

          Task - A task that needs to be done. MDEV-29547 prepare 10.11.0 preview releases

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

          Task - A task that needs to be done. MDEV-28979 Feature Request: Allow for indexes to be created on the information_schema tables

          • Major - Major loss of function.
          • Closed

          Task - A task that needs to be done. MDEV-29104 Performance Issues Reading information_schema.PARAMETERS

          • Major - Major loss of function.
          • Closed

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            People

              oleg.smirnov Oleg Smirnov
              diego dupin Diego Dupin
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              Dates

                Created:
                Updated:
                Resolved:

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