MySQLのトランザクションとロックを表示する一般的な文

データベース内のトランザクションとロックを表示する一般的な文
トランザクションの待機状況を表示するには、次の手順に従います.

SELECT
     r.trx_id waiting_trx_id,
     r.trx_mysql_thread_id waiting_thread,
     r.trx_query waiting_query,
     b.trx_id blocking_trx_id,
     b.trx_mysql_thread_id blocking_thread,
     b.trx_query blocking_query
FROM
     information_schema.innodb_lock_waits w
INNER JOIN information_schema.innodb_trx b ON b.trx_id = w.blocking_trx_id
INNER JOIN information_schema.innodb_trx r ON r.trx_id = w.requesting_trx_id;

より詳細なトランザクション待機状況を表示するには、次の手順に従います.

SELECT
     b.trx_state,
     e.state,
     e.time,
     d.state AS block_state,
     d.time AS block_time,
     a.requesting_trx_id,
     a.requested_lock_id,
     b.trx_query,
     b.trx_mysql_thread_id,
     a.blocking_trx_id,
     a.blocking_lock_id,
     c.trx_query AS block_trx_query,
     c.trx_mysql_thread_id AS block_trx_mysql_tread_id
FROM
     information_schema.INNODB_LOCK_WAITS a
LEFT JOIN information_schema.INNODB_TRX b ON a.requesting_trx_id = b.trx_id
LEFT JOIN information_schema.INNODB_TRX c ON a.blocking_trx_id = c.trx_id
LEFT JOIN information_schema.PROCESSLIST d ON c.trx_mysql_thread_id = d.id
LEFT JOIN information_schema.PROCESSLIST e ON b.trx_mysql_thread_id = e.id
ORDER BY
     a.requesting_trx_id;

クローズされていないトランザクションの表示:–MySQL 5.6

SELECT
     a.trx_id,
     a.trx_state,
     a.trx_started,
     a.trx_query,
     b.ID,
     b.USER,
     b.DB,
     b.COMMAND,
     b.TIME,
     b.STATE,
     b.INFO,
     c.PROCESSLIST_USER,
     c.PROCESSLIST_HOST,
     c.PROCESSLIST_DB,
     d.SQL_TEXT
FROM
     information_schema.INNODB_TRX a
LEFT JOIN information_schema.PROCESSLIST b ON a.trx_mysql_thread_id = b.id
AND b.COMMAND = 'Sleep'
LEFT JOIN PERFORMANCE_SCHEMA.threads c ON b.id = c.PROCESSLIST_ID
LEFT JOIN PERFORMANCE_SCHEMA.events_statements_current d ON d.THREAD_ID = c.THREAD_ID;

–MySQL 5.5

SELECT
     a.trx_id,
     a.trx_state,
     a.trx_started,
     a.trx_query,
     b.ID,
     b. USER,
     b. HOST,
     b.DB,
     b.COMMAND,
     b.TIME,
     b.STATE,
     b.INFO
FROM
     information_schema.INNODB_TRX a
LEFT JOIN information_schema.PROCESSLIST b ON a.trx_mysql_thread_id = b.id
WHERE
     b.COMMAND = 'Sleep';

トランザクションがクローズされていない期間を表示するには、次の手順に従います.

SELECT
        trx_id,
        trx_started,
        trx_mysql_thread_id
FROM
        INFORMATION_SCHEMA.INNODB_TRX
WHERE
        trx_started < date_sub(now(), INTERVAL 1 MINUTE)
AND trx_operation_state IS NULL
AND trx_query IS NULL;