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>   The most important disk monitoring task of a database administrator
   is to make sure the disk doesn't become full.  A filled data disk will
   not result in data corruption, but it might prevent useful activity
   from occurring. If the disk holding the WAL files grows full, database
   server panic and consequent shutdown might occur.
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>   If you cannot free up additional space on the disk by deleting
   other things, you can move some of the database files to other file
   systems by making use of tablespaces. See <A
HREF="manage-ag-tablespaces.html"
>Section 21.6</A
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>    Some file systems perform badly when they are almost full, so do
    not wait until the disk is completely full to take action.
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>   If your system supports per-user disk quotas, then the database
   will naturally be subject to whatever quota is placed on the user
   the server runs as.  Exceeding the quota will have the same bad
   effects as running out of disk space entirely.
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