How do transaction isolation levels control the visibility of changes made by concurrent transactions

Jan 23, 2020 ... Closing the connection is done using end() which makes sure all remaining queries are executed before sending a quit packet to the mysql server. The tables in the MySQL database can be read as if they were normal DuckDB tables, but the underlying data is read directly from MySQL at query time. SHOW ALL ... Begins a transaction. Requires the InnoDB engine (it is enabled by default). For additional details about how MySQL transactions work, see Transactional Statements in MySQL. In MySQL, the transactions begin with either START TRANSACTION, BEGIN or BEGIN WORK statements, and end with either a COMMIT ... Apr 8, 2019 ... Learned something new today about MySQL transaction isolation levels, and adding the `READ UNCOMMITTED` to querying views that take a long time to load. 15.3.1 START TRANSACTION, COMMIT, and ROLLBACK Statements · START TRANSACTION or BEGIN start a new transaction. · COMMIT commits the current transaction, making ... By default, MySqlConnector requires MySqlCommand.Transaction to be set to the connection's active transaction in order for the command to be executed ... Identify Long-Running Queries · Create a local MySQL connection to the site's database. · Run the following command to show a list of active threads: mysql> ... Jun 20, 2012 ... A large log buffer enables large transactions to run without a need to write the log to disk before the transactions commit. 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 ...