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SET @ORIG_PAUSE_BACKGROUND_WORK = @@ROCKSDB_PAUSE_BACKGROUND_WORK;
SET GLOBAL ROCKSDB_PAUSE_BACKGROUND_WORK = 1;
DROP TABLE IF EXISTS t1;
CREATE TABLE t1 (
i INT PRIMARY KEY,
t TINYINT,
s SMALLINT,
m MEDIUMINT,
b BIGINT
) ENGINE=rocksdb;
INSERT INTO t1 (i,t,s,m,b) VALUES (1,2,3,4,5),(1000,100,10000,1000000,1000000000000000000),(5,100,10000,1000000,100000000000000000),(2,3,4,5,6),(3,4,5,6,7),(101,102,103,104,105),(10001,103,10002,10003,10004),(10,11,12,13,14),(11,12,13,14,15),(12,13,14,15,16);
EXPLAIN SELECT i FROM t1 ORDER BY i;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index NULL PRIMARY 4 NULL # Using index
SELECT i FROM t1 ORDER BY i;
i
1
2
3
5
10
11
12
101
1000
10001
DROP TABLE t1;
CREATE TABLE t1 (
i INT,
t TINYINT,
s SMALLINT,
m MEDIUMINT,
b BIGINT,
pk SMALLINT AUTO_INCREMENT PRIMARY KEY,
INDEX s_m (s,m)
) ENGINE=rocksdb;
INSERT INTO t1 (i,t,s,m,b) VALUES (1,2,3,4,5),(1000,100,10000,1000000,1000000000000000000),(5,100,10000,1000000,100000000000000000),(2,3,4,5,6),(3,4,5,6,7),(101,102,103,104,105),(10001,103,10002,10003,10004),(10,11,12,13,14),(11,12,13,14,15),(12,13,14,15,16);
EXPLAIN SELECT s, m FROM t1 WHERE s != 10 AND m != 1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index s_m s_m 7 NULL # Using where; Using index
SELECT s, m FROM t1 WHERE s != 10 AND m != 1;
s m
10000 1000000
10000 1000000
10002 10003
103 104
12 13
13 14
14 15
3 4
4 5
5 6
DROP TABLE t1;
# RocksDB: unique indexes allowed
CREATE TABLE t1 (
i INT,
t TINYINT,
s SMALLINT,
m MEDIUMINT,
b BIGINT,
pk MEDIUMINT AUTO_INCREMENT PRIMARY KEY,
UNIQUE KEY b_t (b,t)
) ENGINE=rocksdb;
INSERT INTO t1 (i,t,s,m,b) VALUES (1,2,3,4,5),(1000,100,10000,1000000,1000000000000000000),(5,100,10000,1000000,100000000000000000),(2,3,4,5,6),(3,4,5,6,7),(101,102,103,104,105),(10001,103,10002,10003,10004),(10,11,12,13,14),(11,12,13,14,15),(12,13,14,15,16);
SELECT b+t FROM t1 WHERE (b,t) IN ( SELECT b, t FROM t1 WHERE i>1 ) ORDER BY b+t;
b+t
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11
25
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29
207
10107
100000000000000100
1000000000000000100
SELECT b+t FROM t1 FORCE INDEX (b_t) WHERE (b,t) IN ( SELECT b, t FROM t1 WHERE i>1 ) ORDER BY b+t;
b+t
9
11
25
27
29
207
10107
100000000000000100
1000000000000000100
SELECT b+t FROM t1 IGNORE INDEX (b_t) WHERE (b,t) IN ( SELECT b, t FROM t1 WHERE i>1 ) ORDER BY b+t;
b+t
9
11
25
27
29
207
10107
100000000000000100
1000000000000000100
DROP TABLE t1;
SET GLOBAL ROCKSDB_PAUSE_BACKGROUND_WORK = @ORIG_PAUSE_BACKGROUND_WORK;
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