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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
154 lines
4.5 KiB
Plaintext
154 lines
4.5 KiB
Plaintext
--source include/have_innodb.inc
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SET innodb_strict_mode=OFF;
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CREATE TABLE test_tab (
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a_str_18 mediumtext,
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b_str_3 varchar(32) DEFAULT NULL,
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a_str_13 mediumtext,
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b_str_5 varchar(40) DEFAULT NULL,
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b_str_6 varchar(50) DEFAULT NULL,
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b_str_7 char(32) DEFAULT NULL,
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b_str_8 varchar(32) DEFAULT NULL,
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b_str_9 varchar(255) DEFAULT NULL,
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a_str_28 char(255) DEFAULT NULL,
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a_str_27 varchar(255) DEFAULT NULL,
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b_str_10 varchar(32) DEFAULT NULL,
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a_str_26 varchar(255) DEFAULT NULL,
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a_str_6 varchar(50) DEFAULT NULL,
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b_str_11 varchar(32) DEFAULT NULL,
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b_str_12 varchar(255) DEFAULT NULL,
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b_str_13 char(32) DEFAULT NULL,
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b_str_14 varchar(32) DEFAULT NULL,
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b_str_15 char(32) DEFAULT NULL,
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b_str_16 char(32) DEFAULT NULL,
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b_str_17 varchar(32) DEFAULT NULL,
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b_str_18 varchar(32) DEFAULT NULL,
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a_str_25 varchar(40) DEFAULT NULL,
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b_str_19 varchar(255) DEFAULT NULL,
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a_str_23 varchar(40) DEFAULT NULL,
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b_str_20 varchar(32) DEFAULT NULL,
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a_str_21 varchar(255) DEFAULT NULL,
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a_str_20 varchar(255) DEFAULT NULL,
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a_str_39 varchar(255) DEFAULT NULL,
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a_str_38 varchar(255) DEFAULT NULL,
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a_str_37 varchar(255) DEFAULT NULL,
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b_str_21 char(32) DEFAULT NULL,
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b_str_23 varchar(80) DEFAULT NULL,
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b_str_24 varchar(32) DEFAULT NULL,
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b_str_25 varchar(32) DEFAULT NULL,
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b_str_26 char(32) NOT NULL DEFAULT '',
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b_str_27 varchar(255) DEFAULT NULL,
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a_str_36 varchar(255) DEFAULT NULL,
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a_str_33 varchar(100) DEFAULT NULL,
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a_ref_10 char(32) DEFAULT NULL,
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b_str_28 char(32) DEFAULT NULL,
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b_str_29 char(32) DEFAULT NULL,
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a_ref_6 char(32) DEFAULT NULL,
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a_ref_12 varchar(32) DEFAULT NULL,
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a_ref_11 varchar(32) DEFAULT NULL,
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a_str_49 varchar(40) DEFAULT NULL,
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b_str_30 varchar(32) DEFAULT NULL,
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a_ref_3 varchar(32) DEFAULT NULL,
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a_str_48 varchar(40) DEFAULT NULL,
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a_ref_1 char(32) DEFAULT NULL,
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b_str_31 varchar(32) DEFAULT NULL,
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b_str_32 varchar(255) DEFAULT NULL,
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b_str_33 char(32) DEFAULT NULL,
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b_str_34 varchar(32) DEFAULT NULL,
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a_str_47 varchar(40) DEFAULT NULL,
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b_str_36 varchar(255) DEFAULT NULL,
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a_str_46 varchar(40) DEFAULT NULL,
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a_str_45 varchar(255) DEFAULT NULL,
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b_str_38 varchar(32) DEFAULT NULL,
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b_str_39 char(32) DEFAULT NULL,
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b_str_40 varchar(32) DEFAULT NULL,
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a_str_41 varchar(255) DEFAULT NULL,
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b_str_41 varchar(32) DEFAULT NULL,
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PRIMARY KEY (b_str_26),
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UNIQUE KEY a_str_47 (a_str_47),
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UNIQUE KEY a_str_49 (a_str_49),
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UNIQUE KEY a_str_33 (a_str_33),
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UNIQUE KEY a_str_46 (a_str_46),
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UNIQUE KEY a_str_48 (a_str_48),
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KEY b_str_18 (b_str_18),
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KEY a_str_26 (a_str_26),
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KEY b_str_27 (b_str_27,b_str_19),
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KEY b_str_41 (b_str_41),
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KEY b_str_15 (b_str_15),
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KEY a_str_20 (a_str_20),
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KEY b_str_17 (b_str_17),
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KEY b_str_40 (b_str_40),
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KEY b_str_24 (b_str_24),
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KEY b_str_10 (b_str_10),
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KEY b_str_16 (b_str_16),
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KEY b_str_29 (b_str_29),
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KEY a_str_41 (a_str_41),
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KEY b_str_7 (b_str_7),
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KEY a_str_45 (a_str_45),
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KEY a_str_28 (a_str_28),
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KEY a_str_37 (a_str_37),
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KEY b_str_6 (b_str_6),
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KEY a_ref_6 (a_ref_6),
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KEY b_str_34 (b_str_34),
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KEY b_str_38 (b_str_38),
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KEY a_ref_10 (a_ref_10),
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KEY b_str_21 (b_str_21),
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KEY b_str_23 (b_str_23,b_str_19),
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KEY b_str_33 (b_str_33),
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KEY a_ref_12 (a_ref_12),
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KEY a_str_18 (a_str_18(255)),
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KEY a_str_39 (a_str_39),
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KEY a_str_27 (a_str_27),
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KEY a_str_25 (a_str_25),
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KEY b_str_9 (b_str_9),
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KEY a_str_23 (a_str_23),
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KEY b_str_8 (b_str_8),
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KEY a_str_21 (a_str_21),
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KEY b_str_3 (b_str_3),
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KEY b_str_30 (b_str_30),
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KEY b_str_12 (b_str_12),
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KEY b_str_25 (b_str_25),
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KEY b_str_13 (b_str_13),
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KEY a_str_38 (a_str_38),
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KEY a_str_13 (a_str_13(255)),
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KEY a_str_36 (a_str_36),
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KEY b_str_28 (b_str_28),
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KEY b_str_19 (b_str_19),
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KEY b_str_11 (b_str_11),
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KEY a_ref_1 (a_ref_1),
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KEY b_str_20 (b_str_20),
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KEY b_str_14 (b_str_14),
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KEY a_ref_3 (a_ref_3),
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KEY b_str_39 (b_str_39),
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KEY b_str_32 (b_str_32),
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KEY a_str_6 (a_str_6),
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KEY b_str_5 (b_str_5),
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KEY b_str_31 (b_str_31),
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KEY a_ref_11 (a_ref_11)
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) ENGINE=InnoDB DEFAULT CHARSET=utf8 ROW_FORMAT=COMPACT;
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SET innodb_strict_mode=ON;
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BEGIN;
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INSERT INTO test_tab (b_str_26, a_str_13, a_str_18) VALUES
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('a', REPEAT('f',4031), REPEAT('g', 4031));
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UPDATE test_tab SET a_str_13=REPEAT('h',4032), a_str_18=REPEAT('i',4032);
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SELECT 'Reducing length to 4030';
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UPDATE test_tab SET a_str_13=REPEAT('j',4030), a_str_18=REPEAT('k',4030);
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UPDATE test_tab SET a_str_13=REPEAT('l',4031), a_str_18=REPEAT('m',4031);
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ROLLBACK;
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SELECT COUNT(*) FROM test_tab;
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CHECK TABLE test_tab;
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DROP TABLE test_tab;
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CREATE TEMPORARY TABLE t2(i INT)ENGINE=InnoDB;
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CREATE TABLE t1(i TEXT NOT NULL) ENGINE=INNODB;
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BEGIN;
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INSERT t1 SET i=REPEAT('1234567890',840);
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UPDATE t1 SET i='';
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INSERT INTO t2 VALUES(2);
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ROLLBACK;
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--source include/wait_all_purged.inc
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DROP TABLE t1;
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DROP TABLE t2;
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