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Blockedtransactions is a cloudwatch metrics applicable for Aurora MySQL only. It gives average number of transactions in the database that are blocked per second this metric is based on innodb metric It is # of transactions currently waiting on row locks it is evaluated using
SELECT name, subsystem, status, count FROM INFORMATION_SCHEMA.INNODB_METRICS where NAME like 'LOCK_ROW_LOCK_CURRENT_WAITS';
+-----------------------------+-----------+---------+-------+
| name | subsystem | status | count |
+-----------------------------+-----------+---------+-------+
| lock_row_lock_current_waits | lock | enabled | 0 |
+-----------------------------+-----------+---------+-------+
1 row in set (0.08 sec)
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