mirror of
https://github.com/MariaDB/server.git
synced 2025-10-30 18:36:12 +01:00
68 lines
1.3 KiB
Text
68 lines
1.3 KiB
Text
DROP TABLE IF EXISTS t1;
|
|
CREATE TABLE t1 (a INT, INDEX (a));
|
|
INSERT INTO t1 VALUES (),(),(),(),(),(),(),(),(),();
|
|
FLUSH STATUS;
|
|
SELECT a FROM t1 ORDER BY a LIMIT 1;
|
|
a
|
|
NULL
|
|
SHOW STATUS LIKE 'HANDLER_READ%';
|
|
Variable_name Value
|
|
Handler_read_first 1
|
|
Handler_read_key 0
|
|
Handler_read_last 0
|
|
Handler_read_next 0
|
|
Handler_read_prev 0
|
|
Handler_read_retry 0
|
|
Handler_read_rnd 0
|
|
Handler_read_rnd_deleted 0
|
|
Handler_read_rnd_next 0
|
|
FLUSH STATUS;
|
|
SELECT a FROM t1 ORDER BY a DESC LIMIT 1;
|
|
a
|
|
NULL
|
|
SHOW STATUS LIKE 'HANDLER_READ%';
|
|
Variable_name Value
|
|
Handler_read_first 0
|
|
Handler_read_key 0
|
|
Handler_read_last 1
|
|
Handler_read_next 0
|
|
Handler_read_prev 0
|
|
Handler_read_retry 0
|
|
Handler_read_rnd 0
|
|
Handler_read_rnd_deleted 0
|
|
Handler_read_rnd_next 0
|
|
FLUSH STATUS;
|
|
SELECT a FROM t1 ORDER BY a LIMIT 3;
|
|
a
|
|
NULL
|
|
NULL
|
|
NULL
|
|
SHOW STATUS LIKE 'HANDLER_READ%';
|
|
Variable_name Value
|
|
Handler_read_first 1
|
|
Handler_read_key 0
|
|
Handler_read_last 0
|
|
Handler_read_next 2
|
|
Handler_read_prev 0
|
|
Handler_read_retry 0
|
|
Handler_read_rnd 0
|
|
Handler_read_rnd_deleted 0
|
|
Handler_read_rnd_next 0
|
|
FLUSH STATUS;
|
|
SELECT a FROM t1 ORDER BY a DESC LIMIT 3;
|
|
a
|
|
NULL
|
|
NULL
|
|
NULL
|
|
SHOW STATUS LIKE 'HANDLER_READ%';
|
|
Variable_name Value
|
|
Handler_read_first 0
|
|
Handler_read_key 0
|
|
Handler_read_last 1
|
|
Handler_read_next 0
|
|
Handler_read_prev 2
|
|
Handler_read_retry 0
|
|
Handler_read_rnd 0
|
|
Handler_read_rnd_deleted 0
|
|
Handler_read_rnd_next 0
|
|
DROP TABLE t1;
|