mysql-optimize - Related information

• Mysql 'where index column = xx and AMISOM index column = yy' sometimes does not take the index?

  for example, I always thought that select * from table where index column = xx and AMISOM column = yy must take the index of index column. but today I found that is not the case . tested (MySQL 5.6.16): when the union condition can match to th...

  Mysql--configure mysql-Index mysql-optimize mysql

  Jan.18,2022
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1e3860a-431e8.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e3860a-431e8.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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