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Oracle Managing Job Chains

Oracle Tips by Burleson Consulting

This is an excerpt from "Oracle 10g New Features for Administrators" by Ahmed Baraka.

• The RUN_CHAIN procedure immediately runs a chain by creating a run-once job with the job name given. If no job_name is given, one is automatically assigned in the form SCHED_CHAIN_JOB${N}. If a list of start steps is given, only those steps are started when the chain begins running (steps that would have normally started are not run). If no list of start steps is given, then the chain starts normally


• The DROP_CHAIN_RULE procedure removes a rule from an existing chain. If dropping this rule makes the chain invalid, the user should first disable the chain to ensure that it does not run.


• Disable a chain


• Drop a chain


• Alter the SKIP or PAUSE attributes of a chain step by using the ALTER_CHAIN procedure. The ALTER_CHAIN procedure affects only future runs of the specified steps.

• Alter the steps in a running chain by using the ALTER_RUNNING_CHAIN procedure

• Drop a step from a chain by using the DROP_CHAIN_STEP procedure

Monitoring Job Chains

DBA_SCHEDULER_CHAINS - contains information about the chain owner and name; the rule set name and rule set owner for the chain; the number of rules; the number of steps; whether or not the chain is enabled; whether or not the chain uses an evaluation interval; and whether or not the chain uses a user-defined rule set.

DBA_SCHEDULER_CHAIN_RULES - displays the name and owner of the chain for which the rule was defined; the rule name, owner, and condition; and the action to be performed if the condition evaluates to TRUE.

DBA_SCHEDULER_CHAIN_STEPS - displays the name and owner of the chain for which the step was created; the step name; the program name and owner; whether the step should be skipped or not; and whether or not the step should be paused after it completes.

DBA_SCHEDULER_RUNNING_CHAINS - contains the chain name and owner; the name and owner of the job that points to the chain; the name of the steps in the chain and their current state; errors encountered by the chain step; the time at which the chain step started and ended; how long it took the step to complete; and the name of the job running the step, if it is current executing.


If you like Oracle tuning, see the book "Oracle Tuning: The Definitive Reference", with 950 pages of tuning tips and scripts. 

You can buy it direct from the publisher for 30%-off and get instant access to the code depot of Oracle tuning scripts.

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