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1748a31ae8
In InnoDB, an INSERT will not create an explicit lock object. Instead, the inserted record is initially implicitly locked by the transaction that wrote its trx_t::id to the hidden system column DB_TRX_ID. (Other transactions would check if DB_TRX_ID is referring to a transaction that has not been committed.) If a record was inserted in the current transaction, it would be implicitly locked by that transaction. Only if some other transaction is requesting access to the record, the implicit lock should be converted to an explicit one, so that the waits-for graph can be constructed for detecting deadlocks and lock wait timeouts. Before this fix, InnoDB would convert implicit locks to explicit ones, even if no conflict exists. lock_rec_convert_impl_to_expl(): Return whether caller_trx already holds an explicit lock that covers the record. row_vers_impl_x_locked_low(): Avoid a lookup if the record matches caller_trx->id. lock_trx_has_expl_x_lock(): Renamed from lock_trx_has_rec_x_lock(). row_upd_clust_step(): In a debug assertion, check for implicit lock before invoking lock_trx_has_expl_x_lock(). rw_trx_hash_t::find(): Make do_ref_count a mandatory parameter. Assert that trx_id is not 0 (the caller should check it). trx_sys_t::is_registered(): Only invoke find() if id != 0. trx_sys_t::find(): Add the optional parameter do_ref_count. lock_rec_queue_validate(): Avoid lookup for trx_id == 0.
53 lines
2.9 KiB
Plaintext
53 lines
2.9 KiB
Plaintext
lock_mode lock_type lock_table lock_index lock_rec lock_data
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X RECORD `test`.```t'\"_str` PRIMARY 2 '1', 'abc', '''abc', 'abc''', 'a''bc', 'a''bc''', '''abc'''''
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X RECORD `test`.```t'\"_str` PRIMARY 2 '1', 'abc', '''abc', 'abc''', 'a''bc', 'a''bc''', '''abc'''''
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X RECORD `test`.```t'\"_str` PRIMARY 3 '2', 'abc', '"abc', 'abc"', 'a"bc', 'a"bc"', '"abc""'
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X RECORD `test`.```t'\"_str` PRIMARY 3 '2', 'abc', '"abc', 'abc"', 'a"bc', 'a"bc"', '"abc""'
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X RECORD `test`.```t'\"_str` PRIMARY 4 '3', 'abc', '\\abc', 'abc\\', 'a\\bc', 'a\\bc\\', '\\abc\\\\'
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X RECORD `test`.```t'\"_str` PRIMARY 4 '3', 'abc', '\\abc', 'abc\\', 'a\\bc', 'a\\bc\\', '\\abc\\\\'
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X RECORD `test`.```t'\"_str` PRIMARY 5 '4', 'abc', '\0abc', 'abc\0', 'a\0bc', 'a\0bc\0', 'a\0bc\0\0'
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X RECORD `test`.```t'\"_str` PRIMARY 5 '4', 'abc', '\0abc', 'abc\0', 'a\0bc', 'a\0bc\0', 'a\0bc\0\0'
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X RECORD `test`.`t_min` PRIMARY 2 -128, 0, -32768, 0, -8388608, 0, -2147483648, 0, -9223372036854775808, 0
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X RECORD `test`.`t_min` PRIMARY 2 -128, 0, -32768, 0, -8388608, 0, -2147483648, 0, -9223372036854775808, 0
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X RECORD `test`.`t_max` PRIMARY 2 127, 255, 32767, 65535, 8388607, 16777215, 2147483647, 4294967295, 9223372036854775807, 18446744073709551615
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X RECORD `test`.`t_max` PRIMARY 2 127, 255, 32767, 65535, 8388607, 16777215, 2147483647, 4294967295, 9223372036854775807, 18446744073709551615
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X RECORD `test`.```t'\"_str` PRIMARY 1 supremum pseudo-record
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X RECORD `test`.```t'\"_str` PRIMARY 1 supremum pseudo-record
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lock_table COUNT(*)
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`test`.`t_max` 2
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`test`.`t_min` 2
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`test`.```t'\"_str` 10
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lock_table COUNT(*)
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"test"."t_max" 2
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"test"."t_min" 2
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"test"."`t'\""_str" 10
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Field Type Null Key Default Extra
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trx_id varchar(18) NO
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trx_state varchar(13) NO
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trx_started datetime NO 0000-00-00 00:00:00
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trx_requested_lock_id varchar(81) YES NULL
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trx_wait_started datetime YES NULL
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trx_weight bigint(21) unsigned NO 0
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trx_mysql_thread_id bigint(21) unsigned NO 0
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trx_query varchar(1024) YES NULL
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trx_operation_state varchar(64) YES NULL
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trx_tables_in_use bigint(21) unsigned NO 0
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trx_tables_locked bigint(21) unsigned NO 0
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trx_lock_structs bigint(21) unsigned NO 0
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trx_lock_memory_bytes bigint(21) unsigned NO 0
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trx_rows_locked bigint(21) unsigned NO 0
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trx_rows_modified bigint(21) unsigned NO 0
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trx_concurrency_tickets bigint(21) unsigned NO 0
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trx_isolation_level varchar(16) NO
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trx_unique_checks int(1) NO 0
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trx_foreign_key_checks int(1) NO 0
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trx_last_foreign_key_error varchar(256) YES NULL
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trx_is_read_only int(1) NO 0
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trx_autocommit_non_locking int(1) NO 0
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trx_state trx_weight trx_tables_in_use trx_tables_locked trx_rows_locked trx_rows_modified trx_concurrency_tickets trx_isolation_level trx_unique_checks trx_foreign_key_checks
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RUNNING 3 0 1 5 1 0 REPEATABLE READ 1 1
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trx_isolation_level trx_unique_checks trx_foreign_key_checks
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SERIALIZABLE 0 0
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trx_state trx_isolation_level trx_last_foreign_key_error
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RUNNING REPEATABLE READ `test`.`t2`, CONSTRAINT `fk1` FOREIGN KEY (`c02`) REFERENCES `t1` (`c01`)
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