mirror of
https://github.com/pgadmin-org/pgadmin4.git
synced 2024-11-28 11:33:53 -06:00
52 lines
2.6 KiB
ReStructuredText
52 lines
2.6 KiB
ReStructuredText
.. _using_pgagent:
|
|
|
|
|
|
**********************
|
|
`Using pgAgent`:index:
|
|
**********************
|
|
|
|
pgAgent is a scheduling agent that runs and manages jobs; each job consists of
|
|
one or more steps and schedules. If two or more jobs are scheduled to execute
|
|
concurrently, pgAgent will execute the jobs in parallel (each with its own
|
|
thread).
|
|
|
|
A step may be a series of SQL statements or an operating system batch/shell
|
|
script. Each step in a given job is executed when the previous step completes,
|
|
in alphanumeric order by name. Switches on the *pgAgent Job* dialog (accessed
|
|
through the *Properties* context menu) allow you to modify a job, enabling or
|
|
disabling individual steps as needed.
|
|
|
|
Each job is executed according to one or more schedules. Each time the job or
|
|
any of its schedules are altered, the next runtime of the job is re-calculated.
|
|
Each instance of pgAgent periodically polls the database for jobs with the next
|
|
runtime value in the past. By polling at least once every minute, all jobs will
|
|
normally start within one minute of the specified start time. If no pgAgent
|
|
instance is running at the next runtime of a job, it will run as soon as pgAgent
|
|
is next started, following which it will return to the normal schedule.
|
|
|
|
When you highlight the name of a defined job in the pgAdmin tree control, the
|
|
*Properties* tab of the main pgAdmin window will display details about the job,
|
|
and the *Statistics* tab will display details about the job's execution.
|
|
|
|
Security Concerns
|
|
*****************
|
|
|
|
pgAgent is a very powerful tool, but does have some security considerations that
|
|
you should be aware of:
|
|
|
|
**Database password** - *DO NOT* be tempted to include a password in the pgAgent
|
|
connection string - on Unix systems it may be visible to all users in *ps*
|
|
output, and on Windows systems it will be stored in the registry in plain text.
|
|
Instead, use a libpq *~/.pgpass* file to store the passwords for every database
|
|
that pgAgent must access. Details of this technique may be found in the
|
|
`PostgreSQL documentation on .pgpass file <https://www.postgresql.org/docs/current/libpq-pgpass.html>`_.
|
|
|
|
**System/database access** - all jobs run by pgAgent will run with the security
|
|
privileges of the pgAgent user. SQL steps will run as the user that pgAgent
|
|
connects to the database as, and batch/shell scripts will run as the operating
|
|
system user that the pgAgent service or daemon is running under. Because of
|
|
this, it is essential to maintain control over the users that are able to create
|
|
and modify jobs. By default, only the user that created the pgAgent database
|
|
objects will be able to do this - this will normally be the PostgreSQL
|
|
superuser.
|