[ < ] | [ > ] | [ << ] | [ Up ] | [ >> ] | [Top] | [Contents] | [Index] | [ ? ] |
Functionality added or changed:
OPTIMIZE TABLE
will for MyISAM tables treat all NULL
values as different when calculating cardinality. This helps in
optimizing joins between tables where one of the tables has a lot of
NULL
values in a indexed column:
SELECT * from t1,t2 where t1.a=t2.key_with_a_lot_of_null; |
FORCE INDEX (key_list)
. This acts likes
USE INDEX (key_list)
but with the addition that a table scan is
assumed to be VERY expensive. One bad thing with this is that it makes
FORCE
a reserved word.
Bugs fixed:
LOAD DATA INFILE
statement that
caused log rotation.