(PECL mysqlnd_ms < 1.6.0)
mysqlnd_ms_xa_gc — Garbage collects unfinished XA transactions after severe errors
Garbage collects unfinished XA transactions.
The XA protocol is a blocking protocol. There exist cases when servers participating in a global transaction cannot make progress when the transaction coordinator crashes or disconnects. In such a case, the MySQL servers keep waiting for instructions to finish the XA transaction in question. Because transactions occupy resources, transactions should always be terminated properly.
Garbage collection requires configuring a state store to track global transactions. Should a PHP client crash in the middle of a transaction and a new PHP client be started, then the built-in garbage collection can learn about the aborted global transaction and terminate it. If you do not configure a state store, the garbage collection cannot perform any cleanup tasks.
The state store should be crash-safe and be highly available to survive its own crash. Currently, only MySQL is supported as a state store.
Garbage collection can also be performed automatically in the background. See the plugin configuration directive garbage_collection for details.
The feature is currently under development. There may be issues and/or feature limitations. Do not use in production environments.
Global transaction identifier (gtrid). If given, the garbage collection considers the transaction only. Otherwise, the state store is scanned for any unfinished transaction.
TRUE if garbage collection was successful. Otherwise, returns