![]() ![]() The JOB_QUEUE_PROCESSES initialization parameter also specifies the maximum number of J nnn processes that can concurrently run on an instance. If this parameter is set to 0, no coordinator job queue process is started at database startup, and consequently no job queue jobs are executed. The JOB_QUEUE_PROCESSES initialization parameter controls whether a coordinator job queue process is started by an instance. ![]() Each J nnn process executes one of the selected jobs. It orders them by time, and then spawns J nnn processes to run the selected jobs. The coordinator periodically selects jobs that are ready to run from the jobs shown in the DBA_JOBS view. For each instance, these job queue processes are dynamically spawned by a coordinator job queue (CJQ0) background process. Job queue (J nnn) processes execute jobs in the job queue. Additional functionality enables you to alter, disable, or delete a job that you previously submitted. To schedule a job you submit it to the job queue, using the Oracle supplied DBMS_JOB package, and specify the frequency at which the job is to be run. You can schedule routines (jobs) to be run periodically using the job queue. Enabling Processes Used for Executing JobsĮnabling Processes Used for Executing Jobs.Supervisor is a process monitor for the Linux operating system, and will automatically restart your queue:work process if it fails.This chapter describes how to use job queues to schedule the periodic execution of user jobs, and contains the following topics: # Supervisor configuration # Installing Supervisor You may use the Db::reconnect method to ensure you have a fresh connection. Similarly, your database connection may disconnect when being used by long-running daemon. For example, if you are doing image manipulation with the GD library, you should free the memory with imagedestroy when you are done. Therefore, you should be careful to free any heavy resources before your job finishes. # Coding for daemon queue workersĭaemon queue workers do not restart the platform before processing each job. If you are using APCu, add apc.enable_cli=1 to your APCu configuration. By default, APCu does not work for CLI commands. Note: This command relies on the cache system to schedule the restart. This command will instruct all queue workers to restart after they finish processing their current job. To push a new job onto the queue, use the Queue::push method: # Basic usage # Pushing a job onto the queue # Driver prerequisitesīefore using the Amazon SQS, Beanstalkd, IronMQ or Redis drivers you will need to install Drivers plugin (opens new window). The null queue driver simply discards queued jobs so they are never executed. In this file you will find connection configurations for each of the queue drivers that are included, such as a database, Beanstalkd (opens new window), IronMQ (opens new window), Amazon SQS (opens new window), Redis (opens new window), null, and synchronous (for local use) driver. The queue configuration file is stored in config/queue.php. Queues allow you to defer the processing of a time consuming task, such as sending an e-mail, until a later time, thus drastically speeding up the web requests to your application.
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