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create temporary table t1 (i int) engine = innodb;
show create table information_schema.innodb_temp_table_info;
Table Create Table
INNODB_TEMP_TABLE_INFO CREATE TEMPORARY TABLE `INNODB_TEMP_TABLE_INFO` (
`TABLE_ID` bigint unsigned NOT NULL DEFAULT '0',
`NAME` varchar(64) DEFAULT NULL,
`N_COLS` int unsigned NOT NULL DEFAULT '0',
`SPACE` int unsigned NOT NULL DEFAULT '0'
) ENGINE=MEMORY DEFAULT CHARSET=utf8mb3
select count(*) from information_schema.innodb_temp_table_info;
count(*)
1
insert into t1 values (1), (2), (3), (4);
select * from t1;
i
1
2
3
4
select * from t1 where i = 4;
i
4
drop table t1;
create temporary table t1 (i int) engine = innodb;
select count(*) from information_schema.innodb_temp_table_info;
count(*)
1
insert into t1 values (1), (2), (3), (4);
select * from t1;
i
1
2
3
4
select * from t1 where i = 4;
i
4
drop table t1;
create temporary table t2 (i int) engine = innodb;
insert into t2 values (1), (2), (3), (4);
select * from t2;
i
1
2
3
4
select * from t2 where i = 4;
i
4
select count(*) from information_schema.innodb_temp_table_info;
count(*)
1
drop table t2;
create temporary table t1 (i int, primary key pk(i)) engine = innodb;
create temporary table t2 (i int, primary key pk(i)) engine = innodb;
create temporary table t3 (i int, primary key pk(i)) engine = innodb;
insert into t1 values (1), (2), (3), (4);
insert into t2 values (1), (2), (3), (4);
insert into t3 values (1), (2), (3), (4);
select * from t1;
i
1
2
3
4
select * from t1 where i = 4;
i
4
select count(*) from information_schema.innodb_temp_table_info;
count(*)
3
drop table t1;
select count(*) from information_schema.innodb_temp_table_info;
count(*)
2
drop table t2;
select count(*) from information_schema.innodb_temp_table_info;
count(*)
1
drop table t3;
create temporary table t1
(keyc int, c1 char(100), c2 char(100),
primary key(keyc)) engine = innodb;
create procedure populate_t1()
begin
declare i int default 1;
while (i <= 200) DO
insert into t1 values (i, 'a', 'b');
set i = i + 1;
end while;
end|
set autocommit=0;
select * from t1;
keyc c1 c2
call populate_t1();
select count(*) from t1;
count(*)
200
select * from t1 limit 10;
keyc c1 c2
1 a b
2 a b
3 a b
4 a b
5 a b
6 a b
7 a b
8 a b
9 a b
10 a b
set autocommit=1;
truncate table t1;
select * from t1;
keyc c1 c2
drop table t1;
create temporary table t1 (i int) engine = innodb;
insert into t1 values (1), (2), (3), (4);
select * from t1;
i
1
2
3
4
select * from t1 where i = 4;
i
4
drop table t1;
create temporary table t1
(keyc int, c1 char(100), c2 char(100),
primary key(keyc))
engine = innodb;
begin;
select * from t1;
keyc c1 c2
call populate_t1();
select count(*) from t1;
count(*)
200
rollback;
select * from t1;
keyc c1 c2
begin;
call populate_t1();
commit;
select count(*) from t1;
count(*)
200
truncate table t1;
select * from t1;
keyc c1 c2
drop table t1;
drop procedure populate_t1;
create temporary table t1 (t1_i int, t1_f float) engine = innodb;
insert into t1 values (1, 1.1), (2, 2.2), (3, 2.2), (4, 4.4);
explain select * from t1 where t1_i = 1;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL ALL NULL NULL NULL NULL 4 25.00 Using where
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`t1_i` AS `t1_i`,`test`.`t1`.`t1_f` AS `t1_f` from `test`.`t1` where (`test`.`t1`.`t1_i` = 1)
alter table t1 add unique index pri_index(t1_i);
explain select * from t1 where t1_i = 1;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL const pri_index pri_index 5 const 1 100.00 NULL
Warnings:
Note 1003 /* select#1 */ select '1' AS `t1_i`,'1.1' AS `t1_f` from `test`.`t1` where true
select * from t1 where t1_i = 1;
t1_i t1_f
1 1.1
alter table t1 add unique index sec_index(t1_f);
ERROR 23000: Duplicate entry '2.2' for key 't1.sec_index'
alter table t1 add index sec_index(t1_f);
explain select * from t1 where t1_f > 2.2;
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
1 SIMPLE t1 NULL range sec_index sec_index 5 NULL 3 100.00 Using index condition
Warnings:
Note 1003 /* select#1 */ select `test`.`t1`.`t1_i` AS `t1_i`,`test`.`t1`.`t1_f` AS `t1_f` from `test`.`t1` where (`test`.`t1`.`t1_f` > 2.2)
select * from t1 where t1_f > 2.2;
t1_i t1_f
2 2.2
3 2.2
4 4.4
alter table t1 add column (t1_c char(10));
select * from t1;
t1_i t1_f t1_c
1 1.1 NULL
2 2.2 NULL
3 2.2 NULL
4 4.4 NULL
insert into t1 values (5, 5.5, 'krunal');
alter table t1 drop column t1_f;
show create table t1;
Table Create Table
t1 CREATE TEMPORARY TABLE `t1` (
`t1_i` int DEFAULT NULL,
`t1_c` char(10) DEFAULT NULL,
UNIQUE KEY `pri_index` (`t1_i`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
select * from t1 where t1_f > 2.2;
ERROR 42S22: Unknown column 't1_f' in 'where clause'
alter table t1 add index sec_index2(t1_c), algorithm=inplace;
ERROR 0A000: ALGORITHM=INPLACE is not supported for this operation. Try ALGORITHM=COPY.
select count(*) from information_schema.innodb_temp_table_info;
count(*)
1
drop table t1;
create temporary table t1 (i int, f float) engine = innodb;
insert into t1 values (10, 1.1), (20, 2.2);
select * from t1;
i f
10 1.1
20 2.2
alter table t1 discard tablespace;
ERROR HY000: Cannot DISCARD/IMPORT tablespace associated with temporary table
alter table t1 import tablespace;
ERROR HY000: Cannot DISCARD/IMPORT tablespace associated with temporary table
drop table t1;
create temporary table t1 (i int) engine=innodb;
insert into t1 values (1), (2), (3);
select * from t1;
i
1
2
3
alter table t1 rename t2;
select * from t1;
ERROR 42S02: Table 'test.t1' doesn't exist
select * from t2;
i
1
2
3
insert into t2 values (1), (2), (6), (7);
select * from t2;
i
1
2
3
1
2
6
7
drop table t2;
SET sql_mode = 'NO_ENGINE_SUBSTITUTION';
create temporary table t (
a int not null,
b blob not null,
index sk (b(3021))
) row_format = dynamic engine=innodb;
drop table t;
create temporary table t (
a int not null,
b blob not null,
index sk (b(3021))
) row_format = dynamic engine=innodb;
drop table t;
create temporary table t (
a int not null,
b blob not null,
index sk (b(3021))
) row_format = dynamic engine=innodb;
drop table t;
SET sql_mode = 'NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES';
SET innodb_strict_mode=OFF;
create temporary table t (
a int not null,
b blob not null,
index sk (b(3021))
) row_format = compact engine=innodb;
ERROR 42000: Specified key was too long; max key length is 767 bytes
SET sql_mode = 'NO_ENGINE_SUBSTITUTION';
create temporary table t (
a int not null,
b blob not null,
index sk (b(3021))
) row_format = dynamic engine=innodb;
drop table t;
create temporary table t (
a int not null,
b blob not null,
index sk (b(3021))
) row_format = compressed engine=innodb;
drop table t;
SET sql_mode = 'NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES';
create temporary table t (
a int not null,
b blob not null,
index sk (b(3021))
) row_format = compact engine=innodb;
ERROR 42000: Specified key was too long; max key length is 767 bytes
SET sql_mode = 'NO_ENGINE_SUBSTITUTION';
create temporary table t (
a int not null,
b blob not null,
index sk (b(3021))
) row_format = dynamic engine=innodb;
drop table t;
DROP TABLE IF EXISTS t1,t2,t3;
CREATE TABLE t6469_1 ( i INT ) ENGINE = Innodb;
CREATE TEMPORARY TABLE t6469_2 ( i INT ) ENGINE = Innodb;
CREATE TEMPORARY table t6469_3 ( i INT ) ENGINE = Innodb ROW_FORMAT=compressed;
Warnings:
Warning 1478 InnoDB: ROW_FORMAT=COMPRESSED is ignored for TEMPORARY TABLE.
Warning 1478 InnoDB: assuming ROW_FORMAT=DYNAMIC.
SELECT count(*) FROM information_schema.files WHERE file_name LIKE '%t6469%';
count(*)
1
SELECT count(*) FROM information_schema.INNODB_DATAFILES WHERE PATH LIKE '%t6469%';
count(*)
1
SELECT count(*) FROM information_schema.INNODB_TABLES WHERE NAME LIKE '%t6469%';
count(*)
1
DROP TABLE t6469_1,t6469_2,t6469_3;
SELECT * FROM information_schema.files WHERE file_name LIKE '%t6469%';
FILE_ID FILE_NAME FILE_TYPE TABLESPACE_NAME TABLE_CATALOG TABLE_SCHEMA TABLE_NAME LOGFILE_GROUP_NAME LOGFILE_GROUP_NUMBER ENGINE FULLTEXT_KEYS DELETED_ROWS UPDATE_COUNT FREE_EXTENTS TOTAL_EXTENTS EXTENT_SIZE INITIAL_SIZE MAXIMUM_SIZE AUTOEXTEND_SIZE CREATION_TIME LAST_UPDATE_TIME LAST_ACCESS_TIME RECOVER_TIME TRANSACTION_COUNTER VERSION ROW_FORMAT TABLE_ROWS AVG_ROW_LENGTH DATA_LENGTH MAX_DATA_LENGTH INDEX_LENGTH DATA_FREE CREATE_TIME UPDATE_TIME CHECK_TIME CHECKSUM STATUS EXTRA
SELECT * FROM information_schema.INNODB_DATAFILES WHERE PATH LIKE '%t6469%';
SPACE PATH
SELECT TABLE_ID, NAME, FLAG, N_COLS, SPACE, ROW_FORMAT, ZIP_PAGE_SIZE, SPACE_TYPE,
INSTANT_COLS, TOTAL_ROW_VERSIONS FROM information_schema.INNODB_TABLES WHERE NAME LIKE '%t6469%';
TABLE_ID NAME FLAG N_COLS SPACE ROW_FORMAT ZIP_PAGE_SIZE SPACE_TYPE INSTANT_COLS TOTAL_ROW_VERSIONS
SET sql_mode=default;
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