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Chapter 12. Transactions Subsystem Tuning
If your environment uses XA distributed transactions, you can tune the transaction manager’s log store for better performance.
The default transaction log store uses a simple file store. For XA transactions this type of log store can be inefficient, as it creates one system file for each transaction log. Especially for XA transactions, a journal store is much more efficient as it uses a journal that consists of one file for all transactions.
For better XA transaction performance, it is recommended that you use a journal log store. For Red Hat Enterprise Linux systems, you can additionally enable asynchronous I/O (AIO) on the journal store to further improve performance.
For Red Hat Enterprise Linux systems, if you are enabling asynchronous I/O (AIO) on the journal store, ensure that the libaio package is installed.
Enable the Journal Log Store Using the Management Console
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Navigate to Configuration
Subsystems Transactions and click View. - Select the Store tab, and click Edit.
- Select the Use journal store check box.
- Optional: For Red Hat Enterprise Linux systems, select the Journal store enable async io check box.
- Click Save.
Enable the Journal Log Store Using the Management CLI
To enable the journal log store using the management CLI, use the following command:
/subsystem=transactions:write-attribute(name=use-journal-store,value=true)
Optional: For Red Hat Enterprise Linux systems, use the following command to enable journal log store asynchronous I/O:
/subsystem=transactions:write-attribute(name=journal-store-enable-async-io, value=true)
