Why not "TRUNCATE" table... ----- Original Message ----- From: "Paul DuBois" <[EMAIL PROTECTED]> To: "gerald_clark" <[EMAIL PROTECTED]>; "Craig Cummings" <[EMAIL PROTECTED]> Cc: <[EMAIL PROTECTED]> Sent: Tuesday, November 09, 2004 11:21 AM Subject: Re: data deleted in MySQL but table file (.MYD) remains same size
> At 13:06 -0600 11/9/04, gerald_clark wrote: > >Craig Cummings wrote: > > > >>Hi there, > >> > >>I have a table with three columns, two varchar(12) identifiers and a > >>longtext column with very long (some > 50 MB) strings. The size of the > >>chromosomes.MYD table was about 2.8 GB. The table was used transiently > >>and I no longer needed to store the strings, so in the interest of freeing > >>up space I did the following: > >> > >>mysql> UPDATE chromosomes SET sequence = ""; > >> > >>When I query the database I can see that the sequence field is a null > >>string for each record. However, the size of the chromosomes.MYD file in > >>the data directory has not changed (i.e. it is still about 2.8 GB). SHOW > >>TABLE STATUS (in mysql) and df (at the shell prompt) both report the same > >>value. > >> > >>How can I get the table size to correspond to the small amount of data > >>that actually remains in the table? Thanks for your assistance. > >> > >> > >Dump it, delete it, and reload it. > >Files never get smaller, only bigger. > > > For MyISAM tables, you could also use OPTIMIZE TABLE. > > -- > Paul DuBois, MySQL Documentation Team > Madison, Wisconsin, USA > MySQL AB, www.mysql.com > > -- > MySQL General Mailing List > For list archives: http://lists.mysql.com/mysql > To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED] > -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED]
