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  1. MariaDB Server
  2. MDEV-7954

my_strcasecmp_utf8() takes 0.19% in OLTP RO

Details

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

    Description

      Call graphs:

      -   0.19%  mysqld  mysqld
         - my_strcasecmp_utf8
            + 50.79% ACL_internal_schema_registry::lookup(char const*)
            + 25.44% find_field_in_table(THD*, TABLE*, char const*, unsigned int, bool, unsigned int*)
            + 14.92% get_cached_schema_access(st_grant_internal_info*, char const*)
            + 5.82% find_field_in_table_ref(THD*, TABLE_LIST*, char const*, unsigned int, char const*, char const*, char const*, Item**, bool, bool, unsigned int*, bool, TABLE_LIST**)
            + 2.13% find_order_in_list(THD*, Item**, TABLE_LIST*, st_order*, List<Item>&, List<Item>&, bool)
            + 0.90% find_item_in_list(Item*, List<Item>&, unsigned int*, find_item_error_report_type, enum_resolution_type*)

      ACL_internal_schema_registry::lookup() does linear search.
      find_field_in_table() most probably does linear search.

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            bar Alexander Barkov
            svoj Sergey Vojtovich
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            Dates

              Created:
              Updated:

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