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14685b10df
The motivation of introducing the parameter innodb_purge_rseg_truncate_frequency in mysql/mysql-server@28bbd66ea5 and mysql/mysql-server@8fc2120fed seems to have been to avoid stalls due to freeing undo log pages or truncating undo log tablespaces. In MariaDB Server, innodb_undo_log_truncate=ON should be a much lighter operation than in MySQL, because it will not involve any log checkpoint. Another source of performance stalls should be trx_purge_truncate_rseg_history(), which is shrinking the history list by freeing the undo log pages whose undo records have been purged. To alleviate that, we will introduce a purge_truncation_task that will offload this from the purge_coordinator_task. In that way, the next innodb_purge_batch_size pages may be parsed and purged while the pages from the previous batch are being freed and the history list being shrunk. The processing of innodb_undo_log_truncate=ON will still remain the responsibility of the purge_coordinator_task. purge_coordinator_state::count: Remove. We will ignore innodb_purge_rseg_truncate_frequency, and act as if it had been set to 1 (the maximum shrinking frequency). purge_coordinator_state::do_purge(): Invoke an asynchronous task purge_truncation_callback() to free the undo log pages. purge_sys_t::iterator::free_history(): Free those undo log pages that have been processed. This used to be a part of trx_purge_truncate_history(). purge_sys_t::clone_end_view(): Take a new value of purge_sys.head as a parameter, so that it will be updated while holding exclusive purge_sys.latch. This is needed for race-free access to the field in purge_truncation_callback(). Reviewed by: Vladislav Lesin
176 lines
6.0 KiB
Plaintext
176 lines
6.0 KiB
Plaintext
SELECT table_id INTO @table_stats_id FROM information_schema.innodb_sys_tables
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WHERE name = 'mysql/innodb_table_stats';
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SELECT table_id INTO @index_stats_id FROM information_schema.innodb_sys_tables
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WHERE name = 'mysql/innodb_index_stats';
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SELECT * FROM INFORMATION_SCHEMA.INNODB_SYS_TABLES
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WHERE table_id NOT IN (@table_stats_id, @index_stats_id) ORDER BY table_id;
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TABLE_ID NAME FLAG N_COLS SPACE ROW_FORMAT ZIP_PAGE_SIZE SPACE_TYPE
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11 SYS_FOREIGN 0 7 0 Redundant 0 System
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12 SYS_FOREIGN_COLS 0 7 0 Redundant 0 System
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13 SYS_VIRTUAL 0 6 0 Redundant 0 System
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16 mysql/transaction_registry 33 8 3 Dynamic 0 Single
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SELECT table_id,pos,mtype,prtype,len,name
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FROM INFORMATION_SCHEMA.INNODB_SYS_COLUMNS
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WHERE table_id NOT IN (@table_stats_id, @index_stats_id)
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ORDER BY table_id, pos;
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table_id pos mtype prtype len name
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11 0 1 524292 0 ID
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11 1 1 524292 0 FOR_NAME
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11 2 1 524292 0 REF_NAME
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11 3 6 0 4 N_COLS
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12 0 1 524292 0 ID
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12 1 6 0 4 POS
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12 2 1 524292 0 FOR_COL_NAME
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12 3 1 524292 0 REF_COL_NAME
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13 0 6 0 8 TABLE_ID
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13 1 6 0 4 POS
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13 2 6 0 4 BASE_POS
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16 0 6 1800 8 transaction_id
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16 1 6 1800 8 commit_id
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16 2 3 526087 7 begin_timestamp
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16 3 3 526087 7 commit_timestamp
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16 4 6 1022 1 isolation_level
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SELECT * FROM INFORMATION_SCHEMA.INNODB_SYS_INDEXES
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WHERE table_id NOT IN (@table_stats_id, @index_stats_id) ORDER BY index_id;
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INDEX_ID NAME TABLE_ID TYPE N_FIELDS PAGE_NO SPACE MERGE_THRESHOLD
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# ID_IND # 3 1 # # 50
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# FOR_IND # 0 1 # # 50
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# REF_IND # 0 1 # # 50
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# ID_IND # 3 2 # # 50
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# BASE_IDX # 3 3 # # 50
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# PRIMARY # 3 1 # # 50
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# commit_id # 2 1 # # 50
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# begin_timestamp # 0 1 # # 50
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# commit_timestamp # 0 2 # # 50
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SELECT index_id,pos,name FROM INFORMATION_SCHEMA.INNODB_SYS_FIELDS
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WHERE name NOT IN ('database_name', 'table_name', 'index_name', 'stat_name')
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ORDER BY index_id, pos;
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index_id pos name
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11 0 ID
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12 0 FOR_NAME
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13 0 REF_NAME
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14 0 ID
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14 1 POS
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15 0 TABLE_ID
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15 1 POS
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15 2 BASE_POS
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18 0 transaction_id
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19 0 commit_id
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20 0 begin_timestamp
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21 0 commit_timestamp
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21 1 transaction_id
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SELECT * FROM INFORMATION_SCHEMA.INNODB_SYS_FOREIGN;
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ID FOR_NAME REF_NAME N_COLS TYPE
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SELECT * FROM INFORMATION_SCHEMA.INNODB_SYS_FOREIGN_COLS;
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ID FOR_COL_NAME REF_COL_NAME POS
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CREATE TABLE t_redundant (a INT KEY, b TEXT) ROW_FORMAT=REDUNDANT ENGINE=innodb;
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CREATE TABLE t_compact (a INT KEY, b TEXT) ROW_FORMAT=COMPACT ENGINE=innodb;
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CREATE TABLE t_compressed (a INT KEY, b TEXT) ROW_FORMAT=COMPRESSED ENGINE=innodb KEY_BLOCK_SIZE=2;
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CREATE TABLE t_dynamic (a INT KEY, b TEXT) ROW_FORMAT=DYNAMIC ENGINE=innodb;
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=== information_schema.innodb_sys_tables and innodb_sys_tablespaces ===
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Table Name Tablespace Table Flags Columns Row Format Zip Size
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test/t_compact test/t_compact 1 5 Compact 0
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test/t_compressed test/t_compressed 37 5 Compressed 2048
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test/t_dynamic test/t_dynamic 33 5 Dynamic 0
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test/t_redundant test/t_redundant 0 5 Redundant 0
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=== information_schema.innodb_sys_tablespaces and innodb_sys_datafiles ===
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Space_Name Page_Size Zip_Size Path
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test/t_redundant DEFAULT DEFAULT MYSQLD_DATADIR/test/t_redundant.ibd
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test/t_compact DEFAULT DEFAULT MYSQLD_DATADIR/test/t_compact.ibd
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test/t_compressed DEFAULT 2048 MYSQLD_DATADIR/test/t_compressed.ibd
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test/t_dynamic DEFAULT DEFAULT MYSQLD_DATADIR/test/t_dynamic.ibd
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innodb_temporary DEFAULT DEFAULT MYSQLD_DATADIR/ibtmp1
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DROP TABLE t_redundant, t_compact, t_compressed, t_dynamic;
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SELECT count(*) FROM INFORMATION_SCHEMA.INNODB_SYS_TABLESTATS;
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count(*)
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6
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CREATE TABLE parent (id INT NOT NULL,
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PRIMARY KEY (id)) ENGINE=INNODB;
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CREATE TABLE child (id INT, parent_id INT,
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INDEX par_ind (parent_id),
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CONSTRAINT constraint_test
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FOREIGN KEY (parent_id) REFERENCES parent(id)
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ON DELETE CASCADE) ENGINE=INNODB;
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SELECT * FROM INFORMATION_SCHEMA.INNODB_SYS_FOREIGN;
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ID FOR_NAME REF_NAME N_COLS TYPE
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test/constraint_test test/child test/parent 1 1
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SELECT * FROM INFORMATION_SCHEMA.INNODB_SYS_FOREIGN_COLS;
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ID FOR_COL_NAME REF_COL_NAME POS
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test/constraint_test parent_id id 0
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INSERT INTO parent VALUES(1);
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InnoDB 0 transactions not purged
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SELECT name, num_rows, ref_count
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FROM INFORMATION_SCHEMA.INNODB_SYS_TABLESTATS
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WHERE name LIKE "%parent";
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name num_rows ref_count
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test/parent 1 1
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SELECT NAME, FLAG, N_COLS FROM INFORMATION_SCHEMA.INNODB_SYS_TABLES
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WHERE name NOT LIKE 'sys/%';
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NAME FLAG N_COLS
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SYS_FOREIGN 0 7
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SYS_FOREIGN_COLS 0 7
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SYS_VIRTUAL 0 6
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mysql/innodb_index_stats 33 11
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mysql/innodb_table_stats 33 9
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mysql/transaction_registry 33 8
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test/child 33 5
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test/parent 33 4
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SELECT name, n_fields
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from INFORMATION_SCHEMA.INNODB_SYS_INDEXES
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WHERE table_id In (SELECT table_id from
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INFORMATION_SCHEMA.INNODB_SYS_TABLES
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WHERE name LIKE "%parent%");
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name n_fields
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PRIMARY 1
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SELECT name, n_fields
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from INFORMATION_SCHEMA.INNODB_SYS_INDEXES
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WHERE table_id In (SELECT table_id from
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INFORMATION_SCHEMA.INNODB_SYS_TABLES
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WHERE name LIKE "%child%");
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name n_fields
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GEN_CLUST_INDEX 0
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par_ind 1
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SELECT name, pos, mtype, len
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from INFORMATION_SCHEMA.INNODB_SYS_COLUMNS
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WHERE table_id In (SELECT table_id from
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INFORMATION_SCHEMA.INNODB_SYS_TABLES
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WHERE name LIKE "%child%");
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name pos mtype len
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id 0 6 4
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parent_id 1 6 4
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DROP TABLE child;
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DROP TABLE parent;
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CREATE TABLE parent (id INT NOT NULL, newid INT NOT NULL,
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PRIMARY KEY (id, newid)) ENGINE=INNODB;
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CREATE TABLE child (id INT, parent_id INT,
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INDEX par_ind (parent_id),
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CONSTRAINT constraint_test
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FOREIGN KEY (id, parent_id) REFERENCES parent(id, newid)
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ON DELETE CASCADE) ENGINE=INNODB;
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SELECT * FROM INFORMATION_SCHEMA.INNODB_SYS_FOREIGN;
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ID FOR_NAME REF_NAME N_COLS TYPE
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test/constraint_test test/child test/parent 2 1
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SELECT * FROM INFORMATION_SCHEMA.INNODB_SYS_FOREIGN_COLS;
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ID FOR_COL_NAME REF_COL_NAME POS
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test/constraint_test id id 0
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test/constraint_test parent_id newid 1
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INSERT INTO parent VALUES(1, 9);
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SELECT * FROM parent WHERE id IN (SELECT id FROM parent);
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id newid
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1 9
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InnoDB 0 transactions not purged
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SELECT name, num_rows, ref_count
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FROM INFORMATION_SCHEMA.INNODB_SYS_TABLESTATS
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WHERE name LIKE "%parent";
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name num_rows ref_count
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test/parent 1 2
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DROP TABLE child;
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DROP TABLE parent;
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#
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# MDEV-29479 I_S.INNODB_SYS_TABLESPACES doesn't have
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# temporary tablespace information
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#
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SELECT SPACE FROM INFORMATION_SCHEMA.INNODB_SYS_TABLESPACES WHERE name like 'innodb_temporary';
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SPACE
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4294967294
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