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69 lines
1.3 KiB
Plaintext
69 lines
1.3 KiB
Plaintext
DROP TABLE IF EXISTS t1;
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CREATE TABLE t1 (a INT, INDEX (a));
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INSERT INTO t1 VALUES (),(),(),(),(),(),(),(),(),();
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FLUSH STATUS;
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SELECT a FROM t1 ORDER BY a LIMIT 1;
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a
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NULL
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SHOW STATUS LIKE 'HANDLER_READ%';
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Variable_name Value
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Handler_read_first 1
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Handler_read_key 0
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Handler_read_last 0
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Handler_read_next 0
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Handler_read_prev 0
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Handler_read_retry 0
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Handler_read_rnd 0
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Handler_read_rnd_deleted 0
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Handler_read_rnd_next 0
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FLUSH STATUS;
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SELECT a FROM t1 ORDER BY a DESC LIMIT 1;
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a
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NULL
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SHOW STATUS LIKE 'HANDLER_READ%';
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Variable_name Value
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Handler_read_first 0
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Handler_read_key 0
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Handler_read_last 1
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Handler_read_next 0
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Handler_read_prev 0
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Handler_read_retry 0
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Handler_read_rnd 0
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Handler_read_rnd_deleted 0
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Handler_read_rnd_next 0
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FLUSH STATUS;
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SELECT a FROM t1 ORDER BY a LIMIT 3;
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a
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NULL
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NULL
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NULL
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SHOW STATUS LIKE 'HANDLER_READ%';
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Variable_name Value
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Handler_read_first 1
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Handler_read_key 0
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Handler_read_last 0
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Handler_read_next 2
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Handler_read_prev 0
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Handler_read_retry 0
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Handler_read_rnd 0
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Handler_read_rnd_deleted 0
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Handler_read_rnd_next 0
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FLUSH STATUS;
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SELECT a FROM t1 ORDER BY a DESC LIMIT 3;
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a
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NULL
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NULL
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NULL
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SHOW STATUS LIKE 'HANDLER_READ%';
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Variable_name Value
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Handler_read_first 0
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Handler_read_key 0
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Handler_read_last 1
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Handler_read_next 0
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Handler_read_prev 2
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Handler_read_retry 0
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Handler_read_rnd 0
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Handler_read_rnd_deleted 0
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Handler_read_rnd_next 0
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DROP TABLE t1;
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