Pae,
Tuesday, November 26, 2002, 6:52:20 PM, you wrote:
PC> I have two tables containing a BLOB cloumn as;
PC> -- supposed to be able to handle up to about 16MB
PC> CRETAE TABLE gallery1 (
PC> id INTEGER,
PC> title VARCHAR(255),
PC> mediumimage MEDIUMBLOB
PC> );
PC> -- supposed to be able to handle up to about 4GB
PC> CRETAE TABLE gallery2 (
PC> id INTEGER,
PC> title VARCHAR(255),
PC> largeimage LONGBLOB
PC> );
PC> Both table show the size about 48KB initially.
PC> And I added a <16MB(about 7,863KB) image into the
PC> table, "gallery1" and a <4GB(about 11,620KB) into
PC> the table, "gallery2", respectively.
PC> The size of gallery1, i,e, "gallery1.db", shows 8,232KB
PC> and the size of gallery2, i.e., "gallery2.db", shows
PC> 11,712KB.
PC> Each table contains only one entry. And I deleted
PC> both entries from two tables. So both tables contain
PC> no entry.
PC> However, the size of tables remain same as after
PC> insertion made.
PC> Q: How come the size of table does not decrease
PC> after deletion?
It's an expected behaviour. According to the MySQL manual:
In MyISAM tables, deleted records are maintained in a linked list
and subsequent INSERT operations reuse old record positions. To
reclaim unused space and reduce file-sizes, use the OPTIMIZE
TABLE statement or the myisamchk utility to reorganise tables.
OPTIMIZE TABLE is easier, but myisamchk is faster.
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