primary-key - Related information

• What tools or ways do mysql and sql server have to check the number of times sql executes?

  or answer my question directly: when a sql of select has a primary key and an index, what is the order of its execution? is there a big god to find it first from the primary key or from the index? ...

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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-64f5-247519f-174e.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-247519f-174e.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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