How are these concurrency control mechanisms implemented and used in MySQL transactions

... Transaction.php \Drupal\driver_test\Driver\Database\DrivertestMysql\Transaction ... Transaction.php \Drupal\Core\Database\Driver\mysql\Transaction; 8.9.x core ... 15.3.1 START TRANSACTION, COMMIT, and ROLLBACK Statements · START TRANSACTION or BEGIN start a new transaction. · COMMIT commits the current transaction, making ... Nov 25, 2024 ... Solution. Use the system variable group_replication_transaction_size_limit to specify a maximum transaction size that the group accepts. In ... It's impossible to use atomic() when autocommit is turned off. Transactions in MySQL¶. If you're using MySQL, your tables may or may not support transactions; ... Jul 17, 2020 ... A modern disk can do ~1000 fsyncs per second, but MySQL will group multiple writes with each fsync. An okay rule-of-thumb would be 5000-15,000 ... ... mysql\Driver\Database\mysql\Connection::popCommittableTransactions(); 9 core ... // Therefore, clean the transaction stack. $this->transactionLayers ... Nov 11, 2020 ... The best we can do is make it clear in docs and in code / run-time behavior that transactions for migrations do not work in MySQL/MariaDB. Mar 1, 2011 ... With the default setting of innodb_lock_wait_timeout = 50 , this transaction completes without errors after 55 seconds. And if you add an UPDATE ... Jan 19, 2009 ... In this post I'll look at another Rails innovation that can be applied equally well to unit testing with Drupal: running each unit test in a separate database ... Backup and transaction log retention values can be changed from the default setting. Learn more. Final backups. Final backups allow you to take a backup of your ...