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CREATE TABLE t1
(
/* fields/keys for row retrieval tests */
key1 INT,
key2 INT,
key3 INT,
key4 INT,
/* make rows much bigger then keys */
filler1 CHAR(200),
KEY(key1),
KEY(key2)
) ENGINE=ROCKSDB;
CREATE TABLE t0 AS SELECT * FROM t1;
# Printing of many insert into t0 values (....) disabled.
# Printing of many insert into t1 select .... from t0 disabled.
# Printing of many insert into t1 (...) values (....) disabled.
SELECT COUNT(*) FROM t1;
COUNT(*)
7201
SET GLOBAL rocksdb_force_flush_memtable_now = 1;
EXPLAIN UPDATE t1 SET filler1='to be deleted' WHERE key1=100 AND key2=100;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index_merge key1,key2 key1,key2 5,5 NULL # Using intersect(key1,key2); Using where
UPDATE t1 SET filler1='to be deleted' WHERE key1=100 and key2=100;
DROP TABLE t0, t1;
create table t1 (key1 int, key2 int, key3 int, key (key1), key (key2), key(key3)) engine=rocksdb;
insert into t1 values (1, 100, 100), (1, 200, 200), (1, 300, 300);
set global rocksdb_force_flush_memtable_now=1;
analyze table t1;
Table Op Msg_type Msg_text
test.t1 analyze status Engine-independent statistics collected
test.t1 analyze status OK
explain select * from t1 where key1 = 1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ref key1 key1 5 const #
explain select key1,key2 from t1 where key1 = 1 or key2 = 1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index_merge key1,key2 key1,key2 5,5 NULL # Using union(key1,key2); Using where
select * from t1 where key1 = 1;
key1 key2 key3
1 100 100
1 200 200
1 300 300
select key1,key2 from t1 where key1 = 1 or key2 = 1;
key1 key2
1 100
1 200
1 300
drop table t1;
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