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SET @save_frequency=@@GLOBAL.innodb_purge_rseg_truncate_frequency;
SET GLOBAL innodb_purge_rseg_truncate_frequency=1;
SELECT table_id INTO @table_stats_id FROM information_schema.innodb_sys_tables
WHERE name = 'mysql/innodb_table_stats';
SELECT table_id INTO @index_stats_id FROM information_schema.innodb_sys_tables
WHERE name = 'mysql/innodb_index_stats';
SELECT * FROM INFORMATION_SCHEMA.INNODB_SYS_TABLES
WHERE table_id NOT IN (@table_stats_id, @index_stats_id) ORDER BY table_id;
TABLE_ID NAME FLAG N_COLS SPACE ROW_FORMAT ZIP_PAGE_SIZE SPACE_TYPE
11 SYS_FOREIGN 0 7 0 Redundant 0 System
12 SYS_FOREIGN_COLS 0 7 0 Redundant 0 System
13 SYS_TABLESPACES 0 6 0 Redundant 0 System
14 SYS_DATAFILES 0 5 0 Redundant 0 System
15 SYS_VIRTUAL 0 6 0 Redundant 0 System
18 mysql/transaction_registry 33 8 3 Dynamic 0 Single
SELECT table_id,pos,mtype,prtype,len,name
FROM INFORMATION_SCHEMA.INNODB_SYS_COLUMNS
WHERE table_id NOT IN (@table_stats_id, @index_stats_id)
ORDER BY table_id, pos;
table_id pos mtype prtype len name
11 0 1 524292 0 ID
11 1 1 524292 0 FOR_NAME
11 2 1 524292 0 REF_NAME
11 3 6 0 4 N_COLS
12 0 1 524292 0 ID
12 1 6 0 4 POS
12 2 1 524292 0 FOR_COL_NAME
12 3 1 524292 0 REF_COL_NAME
13 0 6 0 4 SPACE
13 1 1 524292 0 NAME
13 2 6 0 4 FLAGS
14 0 6 0 4 SPACE
14 1 1 524292 0 PATH
15 0 6 0 8 TABLE_ID
15 1 6 0 4 POS
15 2 6 0 4 BASE_POS
18 0 6 1800 8 transaction_id
18 1 6 1800 8 commit_id
18 2 3 526087 7 begin_timestamp
18 3 3 526087 7 commit_timestamp
18 4 6 1022 1 isolation_level
SELECT * FROM INFORMATION_SCHEMA.INNODB_SYS_INDEXES
WHERE table_id NOT IN (@table_stats_id, @index_stats_id) ORDER BY index_id;
INDEX_ID NAME TABLE_ID TYPE N_FIELDS PAGE_NO SPACE MERGE_THRESHOLD
# ID_IND # 3 1 # # 50
# FOR_IND # 0 1 # # 50
# REF_IND # 0 1 # # 50
# ID_IND # 3 2 # # 50
# SYS_TABLESPACES_SPACE # 3 1 # # 50
# SYS_DATAFILES_SPACE # 3 1 # # 50
# BASE_IDX # 3 3 # # 50
# PRIMARY # 3 1 # # 50
# commit_id # 2 1 # # 50
# begin_timestamp # 0 1 # # 50
# commit_timestamp # 0 2 # # 50
SELECT index_id,pos,name FROM INFORMATION_SCHEMA.INNODB_SYS_FIELDS
WHERE name NOT IN ('database_name', 'table_name', 'index_name', 'stat_name')
ORDER BY index_id, pos;
index_id pos name
11 0 ID
12 0 FOR_NAME
13 0 REF_NAME
14 0 ID
14 1 POS
15 0 SPACE
16 0 SPACE
17 0 TABLE_ID
17 1 POS
17 2 BASE_POS
20 0 transaction_id
21 0 commit_id
22 0 begin_timestamp
23 0 commit_timestamp
23 1 transaction_id
SELECT * FROM INFORMATION_SCHEMA.INNODB_SYS_FOREIGN;
ID FOR_NAME REF_NAME N_COLS TYPE
SELECT * FROM INFORMATION_SCHEMA.INNODB_SYS_FOREIGN_COLS;
ID FOR_COL_NAME REF_COL_NAME POS
CREATE TABLE t_redundant (a INT KEY, b TEXT) ROW_FORMAT=REDUNDANT ENGINE=innodb;
CREATE TABLE t_compact (a INT KEY, b TEXT) ROW_FORMAT=COMPACT ENGINE=innodb;
CREATE TABLE t_compressed (a INT KEY, b TEXT) ROW_FORMAT=COMPRESSED ENGINE=innodb KEY_BLOCK_SIZE=2;
CREATE TABLE t_dynamic (a INT KEY, b TEXT) ROW_FORMAT=DYNAMIC ENGINE=innodb;
=== information_schema.innodb_sys_tables and innodb_sys_tablespaces ===
Table Name Tablespace Table Flags Columns Row Format Zip Size
test/t_compact test/t_compact 1 5 Compact 0
test/t_compressed test/t_compressed 37 5 Compressed 2048
test/t_dynamic test/t_dynamic 33 5 Dynamic 0
test/t_redundant test/t_redundant 0 5 Redundant 0
=== information_schema.innodb_sys_tablespaces and innodb_sys_datafiles ===
Space_Name Page_Size Zip_Size Path
test/t_redundant DEFAULT DEFAULT MYSQLD_DATADIR/test/t_redundant.ibd
test/t_compact DEFAULT DEFAULT MYSQLD_DATADIR/test/t_compact.ibd
test/t_compressed DEFAULT 2048 MYSQLD_DATADIR/test/t_compressed.ibd
test/t_dynamic DEFAULT DEFAULT MYSQLD_DATADIR/test/t_dynamic.ibd
DROP TABLE t_redundant, t_compact, t_compressed, t_dynamic;
SELECT count(*) FROM INFORMATION_SCHEMA.INNODB_SYS_TABLESTATS;
count(*)
8
CREATE TABLE parent (id INT NOT NULL,
PRIMARY KEY (id)) ENGINE=INNODB;
CREATE TABLE child (id INT, parent_id INT,
INDEX par_ind (parent_id),
CONSTRAINT constraint_test
FOREIGN KEY (parent_id) REFERENCES parent(id)
ON DELETE CASCADE) ENGINE=INNODB;
SELECT * FROM INFORMATION_SCHEMA.INNODB_SYS_FOREIGN;
ID FOR_NAME REF_NAME N_COLS TYPE
test/constraint_test test/child test/parent 1 1
SELECT * FROM INFORMATION_SCHEMA.INNODB_SYS_FOREIGN_COLS;
ID FOR_COL_NAME REF_COL_NAME POS
test/constraint_test parent_id id 0
INSERT INTO parent VALUES(1);
InnoDB 0 transactions not purged
SELECT name, num_rows, ref_count
FROM INFORMATION_SCHEMA.INNODB_SYS_TABLESTATS
WHERE name LIKE "%parent";
name num_rows ref_count
test/parent 1 1
SELECT NAME, FLAG, N_COLS FROM INFORMATION_SCHEMA.INNODB_SYS_TABLES
WHERE name NOT LIKE 'sys/%';
NAME FLAG N_COLS
SYS_DATAFILES 0 5
SYS_FOREIGN 0 7
SYS_FOREIGN_COLS 0 7
SYS_TABLESPACES 0 6
SYS_VIRTUAL 0 6
mysql/innodb_index_stats 33 11
mysql/innodb_table_stats 33 9
mysql/transaction_registry 33 8
test/child 33 5
test/parent 33 4
SELECT name, n_fields
from INFORMATION_SCHEMA.INNODB_SYS_INDEXES
WHERE table_id In (SELECT table_id from
INFORMATION_SCHEMA.INNODB_SYS_TABLES
WHERE name LIKE "%parent%");
name n_fields
PRIMARY 1
SELECT name, n_fields
from INFORMATION_SCHEMA.INNODB_SYS_INDEXES
WHERE table_id In (SELECT table_id from
INFORMATION_SCHEMA.INNODB_SYS_TABLES
WHERE name LIKE "%child%");
name n_fields
GEN_CLUST_INDEX 0
par_ind 1
SELECT name, pos, mtype, len
from INFORMATION_SCHEMA.INNODB_SYS_COLUMNS
WHERE table_id In (SELECT table_id from
INFORMATION_SCHEMA.INNODB_SYS_TABLES
WHERE name LIKE "%child%");
name pos mtype len
id 0 6 4
parent_id 1 6 4
DROP TABLE child;
DROP TABLE parent;
CREATE TABLE parent (id INT NOT NULL, newid INT NOT NULL,
PRIMARY KEY (id, newid)) ENGINE=INNODB;
CREATE TABLE child (id INT, parent_id INT,
INDEX par_ind (parent_id),
CONSTRAINT constraint_test
FOREIGN KEY (id, parent_id) REFERENCES parent(id, newid)
ON DELETE CASCADE) ENGINE=INNODB;
SELECT * FROM INFORMATION_SCHEMA.INNODB_SYS_FOREIGN;
ID FOR_NAME REF_NAME N_COLS TYPE
test/constraint_test test/child test/parent 2 1
SELECT * FROM INFORMATION_SCHEMA.INNODB_SYS_FOREIGN_COLS;
ID FOR_COL_NAME REF_COL_NAME POS
test/constraint_test id id 0
test/constraint_test parent_id newid 1
INSERT INTO parent VALUES(1, 9);
SELECT * FROM parent WHERE id IN (SELECT id FROM parent);
id newid
1 9
InnoDB 0 transactions not purged
SELECT name, num_rows, ref_count
FROM INFORMATION_SCHEMA.INNODB_SYS_TABLESTATS
WHERE name LIKE "%parent";
name num_rows ref_count
test/parent 1 2
DROP TABLE child;
DROP TABLE parent;
SET GLOBAL innodb_purge_rseg_truncate_frequency=@save_frequency;
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