config root man

CREATE TABLE t1 (
id int(10) unsigned NOT NULL auto_increment,
k int(10) unsigned NOT NULL default '0',
c char(120) NOT NULL default '',
pad char(60) NOT NULL default '',
PRIMARY KEY (id),
KEY k (k)
) engine=innodb;
ANALYZE TABLE t1;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	OK
SET @@session.sort_buffer_size=32768;
FLUSH STATUS;
SHOW SESSION STATUS LIKE 'Sort%';
Variable_name	Value
Sort_merge_passes	0
Sort_range	0
Sort_rows	0
Sort_scan	0
SELECT c FROM t1 WHERE id between 2 and 1002 ORDER BY c;
SHOW SESSION STATUS LIKE 'Sort%';
Variable_name	Value
Sort_merge_passes	0
Sort_range	1
Sort_rows	139
Sort_scan	0
SET @@session.sort_buffer_size=DEFAULT;
DROP TABLE t1;