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  1. MariaDB Server
  2. MDEV-7953

check_table_name() takes 0.19% in OLTP RO

Details

    • Bug
    • Status: Open (View Workflow)
    • Minor
    • Resolution: Unresolved
    • 10.1(EOL)
    • 10.2(EOL)
    • None
    • None

    Description

      Data comes from Sandy Bridge system running sysbench OLTP RO in 1 thread against 1 table.

      Call graphs:

      -   0.19%  mysqld  mysqld
      		 
         - check_table_name(char const*, unsigned long, bool)
      		 
            + 83.81% st_select_lex::add_table_to_list(THD*, Table_ident*, st_mysql_lex_string*, unsigned long, thr_lock_type, enum_mdl_type, List<Index_hint>*, List<String>*, st_mysql_lex_string*)
      		 
            + 16.19% MYSQLparse(THD*)

      There're a couple of problems with check_table_name():

      • use_mb(system_charset_info) condition should be moved out of the loop
      • check_for_path_chars condition should be moved out of the loop

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            bar Alexander Barkov
            svoj Sergey Vojtovich
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            Dates

              Created:
              Updated:

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