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8.1 KiB
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114 lines
8.1 KiB
ReStructuredText
.. _backup_dialog:
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*****************
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The Backup Dialog
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*****************
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Using the *pg_dump* utility, *pgAdmin* provides an easy way to create a backup in a plain-text or archived format. You can then use a client application (like *psql* or the *Query Tool*) to restore a plain-text backup file, or use the Postgres *pg_restore* utility to restore an archived backup. The *pg_dump* utility must have read access to all database objects that you want to back up.
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You can backup a single table, a schema, or a complete database. Select the name of the backup source in the *pgAdmin* tree control, right click to open the context menu, and select *Backup...* to open the *Backup* dialog. The name of the object selected will appear in the dialog title bar.
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.. image:: images/backup_general.png
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Use the fields in the *General* tab to specify parameters for the backup:
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* Enter the name of the backup file in the *Filename* field. Optionally, select the *Browser* icon (...) to the right to navigate into a directory and select a file that will contain the archive.
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* Use the drop-down listbox in the *Format* field to select the format that is best suited for your application. Each format has advantages and disadvantages:
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* Select *Custom* to create a custom archive file that you can use with *pg_restore* to create a copy of a database. Custom archive file formats must be restored with *pg_restore*. This format offers the opportunity to select which database objects to restore from the backup file. *Custom* archive format is recommended for medium to large databases as it is compressed by default.
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* Select *Tar* to generate a tar archive file that you can restore with *pg_restore*. The tar format does not support compression.
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* Select *Plain* to create a plain-text script file. A plain-text script file contains SQL statements and commands that you can execute at the *psql* command line to recreate the database objects and load the table data. A plain-text backup file can be edited in a text editor, if desired, before using the *psql* program to restore database objects. *Plain* format is normally recommended for smaller databases; script dumps are not recommended for blobs. The SQL commands within the script will reconstruct the database to the last saved state of the database. A plain-text script can be used to reconstruct the database on another machine, or (with modifications) on other architectures.
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* Select *Directory* to generate a directory-format archive suitable for use with *pg_restore*. This file format creates a directory with one file for each table and blob being dumped, plus a *Table of Contents* file describing the dumped objects in a machine-readable format that *pg_restore* can read. This format is compressed by default.
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* Use the *Compression Ratio* field to select a compression level for the backup. Specify a value of zero to mean use no compression; specify a maximum compression value of 9. Please note that tar archives do not support compression.
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* Use the *Encoding* drop-down listbox to select the character encoding method that should be used for the archive.
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* Use the *Number of Jobs* field (when applicable) to specify the number of tables that will be dumped simultaneously in a parallel backup.
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* Use the dropdown listbox next to *Rolename* to specify the role that owns the backup.
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Click the *Dump options* tab to continue. Use the box fields in the *Dump options* tab to provide options for *pg_dump*.
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.. image:: images/backup_sections.png
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* Move switches in the **Sections** field box to select a portion of the object that will be backed up.
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* Move the switch next to *Pre-data* to the *Yes* position to include all data definition items not included in the data or post-data item lists.
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* Move the switch next to *Data* to the *Yes* position to backup actual table data, large-object contents, and sequence values.
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* Move the switch next to *Post-data* to the *Yes* position to include definitions of indexes, triggers, rules, and constraints other than validated check constraints.
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.. image:: images/backup_objects.png
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* Move switches in the **Type of objects** field box to specify details about the type of objects that will be backed up.
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* Move the switch next to *Only data* to the *Yes* position to limit the back up to data.
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* Move the switch next to *Only schema* to limit the back up to schema-level database objects.
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* Move the switch next to *Blobs* to the *No* position to exclude large objects in the backup.
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.. image:: images/backup_do_not_save.png
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* Move switches in the **Do not save** field box to select the objects that will not be included in the backup.
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* Move the switch next to *Owner* to the *Yes* position to include commands that set object ownership.
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* Move the switch next to *Privilege* to the *Yes* position to include commands that create access privileges.
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* Move the switch next to *Tablespace* to the *Yes* position to include tablespaces.
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* Move the switch next to *Unlogged table data* to the *Yes* position to include the contents of unlogged tables.
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.. image:: images/backup_queries.png
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* Move switches in the **Queries** field box to specify the type of statements that should be included in the backup.
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* Move the switch next to *Use Column Inserts* to the *Yes* position to dump the data in the form of INSERT statements and include explicit column names. Please note: this may make restoration from backup slow.
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* Move the switch next to *Use Insert commands* to the *Yes* position to dump the data in the form of INSERT statements rather than using a COPY command. Please note: this may make restoration from backup slow.
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* Move the switch next to *Include CREATE DATABASE statement* to the *Yes* position to include a command in the backup that creates a new database when restoring the backup.
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* Move the switch next to *Include DROP DATABASE statement* to the *Yes* position to include a command in the backup that will drop any existing database object with the same name before recreating the object during a backup.
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.. image:: images/backup_disable.png
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* Move switches in the **Disable** field box to specify the type of statements that should be excluded from the backup.
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* Move the switch next to *Trigger* (active when creating a data-only backup) to the *Yes* position to include commands that will disable triggers on the target table while the data is being loaded.
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* Move the switch next to *$ quoting* to the *Yes* position to enable dollar quoting within function bodies; if disabled, the function body will be quoted using SQL standard string syntax.
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.. image:: images/backup_miscellaneous.png
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* Move switches in the **Miscellaneous** field box to specify miscellaneous backup options.
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* Move the switch next to *With OIDs* to the *Yes* position to include object identifiers as part of the table data for each table.
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* Move the switch next to *Verbose messages* to the *No* position to instruct *pg_dump* to exclude verbose messages.
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* Move the switch next to *Force double quotes on identifiers* to the *Yes* position to force the quoting of all identifiers.
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* Move the switch next to *Use SET SESSION AUTHORIZATION* to the *Yes* position to include a statement that will use a SET SESSION AUTHORIZATION command to determine object ownership (instead of an ALTER OWNER command).
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When you’ve specified the details that will be incorporated into the pg_dump command:
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* Click the *Backup* button to build and execute a command that builds a backup based on your selections on the *Backup* dialog.
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* Click the *Cancel* button to exit without saving work.
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.. image:: images/backup_messages.png
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If the backup is successful, a popup window will confirm success. Click *Click here for details* on the popup window to launch the *Process Watcher*. The *Process Watcher* logs all the activity associated with the backup and provides additional information for troubleshooting.
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.. image:: images/backup_process_watcher.png
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If the backup is unsuccessful, you can review the error messages returned by the backup command on the *Process Watcher*.
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