• Rohit Kalhans's avatar
    BUG#11758263 50440: MARK UNORDERED UPDATE WITH AUTOINC UNSAFE · 52491489
    Rohit Kalhans authored
           
    Problem: Statements that write to tables with auto_increment columns
             based on the selection from another table, may lead to master
             and slave going out of sync, as the order in which the rows
             are retrieved from the table may differ on master and slave.
                
    Solution: We mark writing to a table with auto_increment table
              based on the rows selected from another table as unsafe. This
              will cause the execution of such statements to throw a warning
              and forces the statement to be logged in ROW if the logging
              format is mixed. 
                
    Changes:
           1. All the statements that writes to a table with auto_increment 
              column(s) based on the rows fetched from another table, will now
              be unsafe.
           2. CREATE TABLE with SELECT will now be unsafe.
    
    sql/share/errmsg-utf8.txt:
      Added new warning messages.
    sql/sql_base.cc:
      -Created function to check statements that write to 
       tables with auto_increment column and has select.
      -Marked all the statements that write to a table
       with auto_increment column based on rows fetched
       from other table(s) as unsafe.
    sql/sql_table.cc:
      mark CREATE TABLE[with auto_increment column] as unsafe.
    52491489
multi_update.test 22.3 KB