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0513a4a974
Send ok packet earlier for SELECT queries that does not have any updates. This is done in select_send::send_eof() Axel's select benchmarks shows that this has a notable speed improvement: 1 Thread: 28% TPS speedup 8 Threads: 23% 64 Threads 6% This was meassured with t_oltp_point_select With InnoDB running the client over sockets. Other things: - Moved error reporting of LIMIT ROWS EXAMINED from handle_select() to check_limit_rows_examined(). This is to ensure that the error is reported before send_eof() is called. - Removed duplicate "Query execution was interrupted" messages for the same query. killed_for_exceeding_limit_rows_warning_given was introduced for this purpose. We cannot use 'killed' flag in killed_for_exceeding_limit_rows() to detect if we already have produced a warning as the 'killed' in this case is reset for each union. Reviewer: Sergei Golubchik <serg@mariadb.org> |
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