Overview The default method by which SQLite implements atomic commit and rollback is a rollback journal. Beginning with version 3. There are advantages and disadvantages to using WAL instead of a rollback journal.
Defines if the queue subscribed to is durable saved to persistent storage or transient will disappear if the AMQP broker is restarted. This option should be used in conjunction with the Persistent option on the publish side.
QueueAutoDelete true false Subscribe only Defines if the queue subscribed to will be deleted once the last consumer unsubscribes. RoutingKey Key In Publish blocks, this configures the routing key to set on all outgoing messages.
If not given, the routing key will be computed from the identifier of the value. The host, plugin, type and the two instances are concatenated together using dots as the separator and all containing dots replaced with slashes. This makes it possible to receive only specific values using a "topic" exchange.
In Subscribe blocks, configures the routing key used when creating a binding between an exchange and the queue.
The usual wildcards can be used to filter messages when using a "topic" exchange.
Persistent true false Publish only Selects the delivery method to use. If set to true, the persistent mode will be used, i.
If set to false the defaultthe transient delivery mode will be used, i. Defaults to 0, which implies collectd will attempt to reconnect at each read interval in Subscribe mode or each time values are ready for submission in Publish mode. A subscribing client should use the Content-Type header field to determine how to decode the values.
If set to false the defaultno conversion is performed. Otherwise the conversion is performed using the internal value cache.When using MySQL with log files, you will, from time to time, want to remove/back up old log files and tell MySQL to start logging on new files. See Section On a Linux (RedHat) installation, you can use the mysql-log-rotate script for this.
The MySQL server maintains many status variables that provide information about its operation. You can view these variables and their values by using the SHOW [GLOBAL | SESSION] STATUS statement (see Section , “SHOW STATUS Syntax”).The optional GLOBAL keyword aggregates the values over all connections, and SESSION .
The PostgreSQL CDC Client origin processes Write-Ahead Logging (WAL) data to generate change data capture records for a PostgreSQL database.
Use the PostgreSQL CDC Client origin to process WAL data from PostgreSQL or later. Specifies how many memcached write operations, such as add, set, and incr, to perform before doing a COMMIT to start a new transaction. Counterpart of daemon_memcached_r_batch_size. This value is set to 1 by default, on the assumption that data being stored is important to preserve in case of an outage and should .
So, what can I do with PHP/FI? The first thing you will notice if you run a page through PHP/FI is that it adds a footer with information about the number of times your page has been accessed (if you have compiled access logging into the binary). Write-Ahead log contains all changed data, Command log will require addition processing, but fast and lightweight.
VoltDB: Command Logging and Recovery The key to command logging is that it logs the invocations, not the consequences, of the transactions.