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  1. MariaDB Server
  2. MDEV-34031

FLUSH QUERY_RESPONSE_TIME_WRITE also flushes READ, and vice versa

Details

    Description

      All of

      FLUSH QUERY_RESPONSE_TIME
      		 
      FLUSH QUERY_RESPONSE_TIME_READ
      		 
      FLUSH QUERY_RESPONSE_TIME_WRITE
      		 
      FLUSH QUERY_RESPONSE_TIME_READ_WRITE

      appear to do the same, flush everything, both read and write statistics.
      It is reasonable for FLUSH QUERY_RESPONSE_TIME_READ_WRITE and FLUSH QUERY_RESPONSE_TIME, but it seems very counter-intuitive that FLUSH QUERY_RESPONSE_TIME_WRITE would also flush read statistics, and vice versa.

      install soname 'query_response_time';
      		 
       
      		 
      create table t1 (a int);
      		 
       
      		 
      set query_response_time_session_stats=on;
      		 
      insert into t1 values (1);
      		 
      insert into t1 values (2);
      		 
      select * from t1;
      		 
      select sum(count) from information_schema.query_response_time_read;
      		 
      select sum(count) from information_schema.query_response_time_write;
      		 
      flush query_response_time_write;
      		 
      select sum(count) from information_schema.query_response_time_read;
      		 
      select sum(count) from information_schema.query_response_time_write;
      		 
       
      		 
      # Cleanup
      		 
      drop table t1;
      		 
      uninstall soname 'query_response_time';

      bb-11.5-MDEV-33501-query-response-time 2b35d7c1bcb069428e7fe86a3ce39110df8df4e8

      		 
      select sum(count) from information_schema.query_response_time_read;
      		 
      sum(count)
      		 
      2
      		 
      select sum(count) from information_schema.query_response_time_write;
      		 
      sum(count)
      		 
      2
      		 
      flush query_response_time_write;
      		 
      select sum(count) from information_schema.query_response_time_read;
      		 
      sum(count)
      		 
      0
      		 
      select sum(count) from information_schema.query_response_time_write;
      		 
      sum(count)
      		 
      0

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          is caused by

          New Feature - A new feature of the product, which has yet to be developed. MDEV-33501 Extend query_response_time plugin to be compatible with Percona server

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

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              monty Michael Widenius
              elenst Elena Stepanova
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              Dates

                Created:
                Updated:
                Resolved:

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