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53 lines
2.6 KiB
ReStructuredText
53 lines
2.6 KiB
ReStructuredText
.. _using_pgagent:
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**********************
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`Using pgAgent`:index:
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**********************
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pgAgent is a scheduling agent that runs and manages jobs; each job consists of
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one or more steps and schedules. If two or more jobs are scheduled to execute
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concurrently, pgAgent will execute the jobs in parallel (each with it's own
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thread).
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A step may be a series of SQL statements or an operating system batch/shell
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script. Each step in a given job is executed when the previous step completes,
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in alphanumeric order by name. Switches on the *pgAgent Job* dialog (accessed
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through the *Properties* context menu) allow you to modify a job, enabling or
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disabling individual steps as needed.
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Each job is executed according to one or more schedules. Each time the job or
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any of its schedules are altered, the next runtime of the job is re-calculated.
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Each instance of pgAgent periodically polls the database for jobs with the next
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runtime value in the past. By polling at least once every minute, all jobs will
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normally start within one minute of the specified start time. If no pgAgent
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instance is running at the next runtime of a job, it will run as soon as pgAgent
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is next started, following which it will return to the normal schedule.
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When you highlight the name of a defined job in the pgAdmin tree control, the
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*Properties* tab of the main pgAdmin window will display details about the job,
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and the *Statistics* tab will display details about the job's execution.
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Security Concerns
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*****************
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pgAgent is a very powerful tool, but does have some security considerations that
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you should be aware of:
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**Database password** - *DO NOT* be tempted to include a password in the pgAgent
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connection string - on Unix systems it may be visible to all users in *ps*
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output, and on Windows systems it will be stored in the registry in plain text.
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Instead, use a libpq *~/.pgpass* file to store the passwords for every database
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that pgAgent must access. Details of this technique may be found in the
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`PostgreSQL documentation on .pgpass file <https://www.postgresql.org/docs/current/libpq-pgpass.html>`_.
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**System/database access** - all jobs run by pgAgent will run with the security
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privileges of the pgAgent user. SQL steps will run as the user that pgAgent
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connects to the database as, and batch/shell scripts will run as the operating
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system user that the pgAgent service or daemon is running under. Because of
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this, it is essential to maintain control over the users that are able to create
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and modify jobs. By default, only the user that created the pgAgent database
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objects will be able to do this - this will normally be the PostgreSQL
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superuser.
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