Which version of MySQL is production-ready (GA)?
MySQL 5.6 and MySQL 5.5 are supported for production use.
MySQL 5.6 achieved General Availability (GA) status with MySQL 5.6.10, which was released for production use on 5 February 2013.
MySQL 5.5 achieved General Availability (GA) status with MySQL 5.5.8, which was released for production use on 3 December 2010.
MySQL 5.1 achieved General Availability (GA) status with MySQL 5.1.30, which was released for production use on 14 November 2008. Active development for MySQL 5.1 has ended.
MySQL 5.0 achieved General Availability (GA) status with MySQL 5.0.15, which was released for production use on 19 October 2005. Active development for MySQL 5.0 has ended.
What is the state of development (non-GA) versions?
MySQL follows a milestone release model that introduces pre-production-quality features and stabilizes them to release quality (see http://dev.mysql.com/doc/mysql-development-cycle/en/index.html). This process then repeats, so releases cycle between pre-production and release quality status. Please check the change logs to identify the status of a given release.
MySQL 5.4 was a development series. Work on this series has ceased.
MySQL 5.7 is being actively developed using the milestone release methodology described above.
Can MySQL 5.7 do subqueries?
Yes. See Section 13.2.10, “Subquery Syntax”.
Can MySQL 5.7 perform multiple-table inserts, updates, and deletes?
Does MySQL 5.7 have a Query Cache? Does it work on Server, Instance or Database?
Yes. The query cache operates on the server level, caching complete result sets matched with the original query string. If an exactly identical query is made (which often happens, particularly in web applications), no parsing or execution is necessary; the result is sent directly from the cache. Various tuning options are available. See Section 8.10.3, “The MySQL Query Cache”.
Does MySQL 5.7 have Sequences?
No. However, MySQL has an
Does MySQL 5.7 have a
No. This is on the MySQL roadmap as a “rolling feature”. This means that it is not a flagship feature, but will be implemented, development time permitting. Specific customer demand may change this scheduling.
However, MySQL does parse time strings with a fractional component. See Section 11.3.2, “The TIME Type”.
Does MySQL 5.7 work with multi-core processors?
Yes. MySQL is fully multi-threaded, and will make use of multiple CPUs, provided that the operating system supports them.
Why do I see multiple processes for
When using LinuxThreads, you should see a minimum of three mysqld processes running. These are in fact threads. There is one thread for the LinuxThreads manager, one thread to handle connections, and one thread to handle alarms and signals.
Can MySQL 5.7 perform ACID transactions?
Yes. All current MySQL versions support transactions. The