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We implement an idea that was suggested by Michael 'Monty' Widenius in October 2017: When InnoDB is inserting into an empty table or partition, we can write a single undo log record TRX_UNDO_EMPTY, which will cause ROLLBACK to clear the table. For this to work, the insert into an empty table or partition must be covered by an exclusive table lock that will be held until the transaction has been committed or rolled back, or the INSERT operation has been rolled back (and the table is empty again), in lock_table_x_unlock(). Clustered index records that are covered by the TRX_UNDO_EMPTY record will carry DB_TRX_ID=0 and DB_ROLL_PTR=1<<55, and thus they cannot be distinguished from what MDEV-12288 leaves behind after purging the history of row-logged operations. Concurrent non-locking reads must be adjusted: If the read view was created before the INSERT into an empty table, then we must continue to imagine that the table is empty, and not try to read any records. If the read view was created after the INSERT was committed, then all records must be visible normally. To implement this, we introduce the field dict_table_t::bulk_trx_id. This special handling only applies to the very first INSERT statement of a transaction for the empty table or partition. If a subsequent statement in the transaction is modifying the initially empty table again, we must enable row-level undo logging, so that we will be able to roll back to the start of the statement in case of an error (such as duplicate key). INSERT IGNORE will continue to use row-level logging and locking, because implementing it would require the ability to roll back the latest row. Since the undo log that we write only allows us to roll back the entire statement, we cannot support INSERT IGNORE. We will introduce a handler::extra() parameter HA_EXTRA_IGNORE_INSERT to indicate to storage engines that INSERT IGNORE is being executed. In many test cases, we add an extra record to the table, so that during the 'interesting' part of the test, row-level locking and logging will be used. Replicas will continue to use row-level logging and locking until MDEV-24622 has been addressed. Likewise, this optimization will be disabled in Galera cluster until MDEV-24623 enables it. dict_table_t::bulk_trx_id: The latest active or committed transaction that initiated an insert into an empty table or partition. Protected by exclusive table lock and a clustered index leaf page latch. ins_node_t::bulk_insert: Whether bulk insert was initiated. trx_t::mod_tables: Use C++11 style accessors (emplace instead of insert). Unlike earlier, this collection will cover also temporary tables. trx_mod_table_time_t: Add start_bulk_insert(), end_bulk_insert(), is_bulk_insert(), was_bulk_insert(). trx_undo_report_row_operation(): Before accessing any undo log pages, invoke trx->mod_tables.emplace() in order to determine whether undo logging was disabled, or whether this is the first INSERT and we are supposed to write a TRX_UNDO_EMPTY record. row_ins_clust_index_entry_low(): If we are inserting into an empty clustered index leaf page, set the ins_node_t::bulk_insert flag for the subsequent trx_undo_report_row_operation() call. lock_rec_insert_check_and_lock(), lock_prdt_insert_check_and_lock(): Remove the redundant parameter 'flags' that can be checked in the caller. btr_cur_ins_lock_and_undo(): Simplify the logic. Correctly write DB_TRX_ID,DB_ROLL_PTR after invoking trx_undo_report_row_operation(). trx_mark_sql_stat_end(), ha_innobase::extra(HA_EXTRA_IGNORE_INSERT), ha_innobase::external_lock(): Invoke trx_t::end_bulk_insert() so that the next statement will not be covered by table-level undo logging. ReadView::changes_visible(trx_id_t) const: New accessor for the case where the trx_id_t is not read from a potentially corrupted index page but directly from the memory. In this case, we can skip a sanity check. row_sel(), row_sel_try_search_shortcut(), row_search_mvcc(): row_sel_try_search_shortcut_for_mysql(), row_merge_read_clustered_index(): Check dict_table_t::bulk_trx_id. row_sel_clust_sees(): Replaces lock_clust_rec_cons_read_sees(). lock_sec_rec_cons_read_sees(): Replaced with lower-level code. btr_root_page_init(): Refactored from btr_create(). dict_index_t::clear(), dict_table_t::clear(): Empty an index or table, for the ROLLBACK of an INSERT operation. ROW_T_EMPTY, ROW_OP_EMPTY: Note a concurrent ROLLBACK of an INSERT into an empty table. This is joint work with Thirunarayanan Balathandayuthapani, who created a working prototype. Thanks to Matthias Leich for extensive testing.
140 lines
4.7 KiB
Text
140 lines
4.7 KiB
Text
#################### mysql-test\t\identity_func.test ##########################
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# #
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# Variable Name: identity #
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# Scope: SESSION #
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# Access Type: Dynamic #
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# Data Type: numeric #
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# Default Value: - #
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# Range: - #
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# #
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# #
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# Creation Date: 2008-03-07 #
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# Author: Salman Rawala #
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# #
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# Description: Test Cases of Dynamic System Variable identity #
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# that checks the functionality of this variable #
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# #
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# Reference: http://dev.mysql.com/doc/refman/5.1/en/ #
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# server-system-variables.html #
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# #
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###############################################################################
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--source include/have_innodb.inc
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--disable_warnings
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drop table if exists t1;
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drop table if exists t2;
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--enable_warnings
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#########################
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# Creating new table #
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#########################
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--echo ## Creating new table t1 ##
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CREATE TABLE t1
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(
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id INT NOT NULL auto_increment,
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PRIMARY KEY (id),
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name VARCHAR(30)
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) ENGINE = INNODB;
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--echo ## Creating another new table t2 ##
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CREATE TABLE t2
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(
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id INT NOT NULL auto_increment,
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PRIMARY KEY (id),
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name VARCHAR(30)
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) ENGINE = INNODB;
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# MDEV-515 takes X-lock on the table for the first insert
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# So concurrent insert won't happen on the table
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INSERT INTO t1 VALUES(100, "MDEV-515");
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INSERT INTO t2 VALUES(100, "MDEV-515");
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--echo '#--------------------FN_DYNVARS_035_01-------------------------#'
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###############################################
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# Verifying initial value of identity. #
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###############################################
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--echo ## It should be zero ##
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SELECT @@identity = 0;
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connect (test_con1, localhost, root,,);
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connection test_con1;
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SET @@autocommit = 0;
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--echo ## Inserting rows in table t1 ##
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INSERT into t1(name) values('Record_1');
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INSERT into t1(name) values('Record_2');
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INSERT into t1(name) values('Record_3');
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--echo ## Verifying total values in t1 ##
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SELECT @@identity from t1;
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--echo ## Now inserting some data in table t2 ##
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INSERT into t2(name) values('Record_1');
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--echo ## Verifying total values in t2 ##
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SELECT @@identity from t2;
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--echo '#--------------------FN_DYNVARS_035_02-------------------------#'
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##########################################################
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# Verifying value of identity with new connection #
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##########################################################
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connect (test_con2, localhost, root,,);
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connection test_con2;
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SELECT * from t1;
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--echo ## Verifying total values in t1 ##
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SELECT @@identity from t1;
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--echo ## Verifying total values in t2 ##
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SELECT @@identity from t2;
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--echo ## Inserting some more records in table t1 ##
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INSERT into t1(name) values('Record_1_1');
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INSERT into t1(name) values('Record_1_2');
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--echo ## Verifying total values in t1 ##
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SELECT @@identity from t1;
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--echo ## Inserting row in table t2 ##
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INSERT into t2(name) values('Record_1_3');
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--echo ## Verifying total values in t2 ##
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SELECT @@identity from t2;
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--echo '#--------------------FN_DYNVARS_035_03-------------------------#'
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###################################################################
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# Verifying identity value by using commit in connectio # 01 #
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###################################################################
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connection test_con1;
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--echo ## Commiting rows added in test_con1 ##
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COMMIT;
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--echo ## Verifying records in both tables ##
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SELECT * from t1;
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SELECT * from t2;
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--echo ## Verifying total values in t1 after commiting data ##
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SELECT @@identity from t1;
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--echo ## Verifying total values in t2 after commiting data ##
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SELECT @@identity from t2;
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INSERT into t1(name) values('Record_4');
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--echo ## Now verifying value of variable after inserting 1 row in this connection ##
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SELECT @@identity from t1;
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--echo ## Dropping tables t1 & t2 ##
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drop table t1, t2;
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disconnect test_con1;
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disconnect test_con2;
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