JOB_QUEUE_PROCESSES specifies the maximum number of job slaves per instance that can be created for the execution of DBMS_JOB jobs and Oracle Scheduler (DBMS_SCHEDULER) jobs. DBMS_JOB and Oracle Scheduler share the same job coordinator and job slaves, and they are both controlled by the JOB_QUEUE_PROCESSES parameter.
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Advanced replication uses Oracle Scheduler for data refreshes. Oracle Streams Advanced Queuing uses Oracle Scheduler for message propagation. Materialized views use Oracle Scheduler for automatic refreshes. Setting JOB_QUEUE_PROCESS to 0 will disable these features as well as any other features that use Oracle Scheduler or DBMS_JOB.
a、對(duì)于Oracle job進(jìn)程,包含協(xié)調(diào)進(jìn)程(主進(jìn)程)以及奴隸進(jìn)程(子進(jìn)程)。
b、job_queue_processes取值范圍為0到1000,總共可創(chuàng)建多少個(gè)job進(jìn)程由job_queue_processes參數(shù)來決定。
c、當(dāng)job_queue_processes大于1時(shí),且并行執(zhí)行job時(shí),至少一個(gè)為協(xié)調(diào)進(jìn)程。其總數(shù)不會(huì)超出job_queue_processes的值。
d、job_queue_processes參數(shù)的值為且DBMS_JOB與DBMS_SCHEDULER共享。
e、job_queue_processes參數(shù),當(dāng)設(shè)定該值為0的時(shí)候則任意方式創(chuàng)建的job都不會(huì)運(yùn)行。
f、非零值的job_queue_processes,其job子進(jìn)程數(shù)依賴于可用資源,資源配置方式以及當(dāng)前運(yùn)行的job數(shù)來自行調(diào)整。
g、此外對(duì)于Scheduler jobs方式還受限制于scheduler屬性MAX_JOB_SLAVE_PROCESSES的設(shè)置。
h、可以通過DBMS_SCHEDULER.SET_SCHEDULER_ATTRIBUTE來設(shè)置max_job_slave_processes
此參數(shù)可以alter system立即生效
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