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50 lines
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50 lines
2.0 KiB
ReStructuredText
.. _maintenance_dialog:
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***************************
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`Maintenance Dialog`:index:
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***************************
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Use the *Maintenance* dialog to VACUUM, ANALYZE, REINDEX or CLUSTER a database
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or selected database objects.
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.. image:: images/maintenance.png
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:alt: Maintenance dialog
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:align: center
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While this utility is useful for ad-hoc maintenance purposes, you are encouraged
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to perform automatic VACUUM jobs on a regular schedule.
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Select a button next to *Maintenance operation* to specify the type of
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maintenance:
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* Click *VACUUM* to scan the selected database or table to reclaim storage used
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by dead tuples.
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* Move the *FULL* switch to the *Yes* position to compact tables by writing
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a completely new version of the table file without dead space. The default
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is *No*.
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* Move the *FREEZE* switch to the *Yes* position to freeze data in a table
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when it will have no further updates. The default is *No*.
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* Move the *ANALYZE* switch to the *Yes* position to issue ANALYZE commands
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whenever the content of a table has changed sufficiently. The default is
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*No*.
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* Click *ANALYZE* to update the stored statistics used by the query planner.
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This enables the query optimizer to select the fastest query plan for optimal
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performance.
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* Click *REINDEX* to rebuild any index in case it has degenerated due to the
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insertion of unusual data patterns. This happens, for example, if you insert
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rows with increasing index values, and delete low index values.
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* Click *CLUSTER* to instruct PostgreSQL to cluster the selected table.
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To exclude status messages from the process output, move the *Verbose Messages*
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switch to the *No* position; by default, status messages are included.
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When you've completed the dialog, click *OK* to start the background process;
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to exit the dialog without performing maintenance operations, click *Cancel*.
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pgAdmin will run the maintenance process in background. You can view all the background
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process with there running status and logs on the :ref:`Processes <processes>`
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tab |