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GNU/Linux |
RedHat 5.2(Apollo) |
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pg_dump(1) |
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pg_dump - dumps out a Postgres database into a script file
pg_dump [-a ] [-d ] [-D ] [-f filename ] [-h hostname ] [-o ] [-p port] [-s ] [-t table] [-v ] [-u] dbname
pg_dump is a utility for dumping out a Postgres database into a script file containing query commands. The script files are in a ASCII format and can be used to reconstruct the database, even on other machines and other architectures. pg_dump will produce the queries necessary to re-generate all user-defined types, functions, tables, indices, aggregates, and operators. In addition, all the data is copied out in ASCII format so that it can be readily copied in again, as well, as imported into tools for textual editing.
pg_dump is useful for dumping out the contents of a database to move from one postgreSQL installation to another. After running pg_dump , one should examine the output script file for any warnings, especially in light of the limitations listed below.
pg_dump understands the following options:
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-a |
Dump out only the data, no schema |
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-d |
Dump data as proper insert strings |
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-D |
Dump data as inserts with attribute names |
-f filename
Specifies the output file
-h hostname
Specifies the server host name
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-o |
Dump object id’s (oids) |
-p port
Specifies the server port number
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-s |
Dump out only the schema, no data |
-t table
Dump for this table only
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-u |
Use password authentication. Prompts for username and password. | ||
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-v |
Specifies verbose mode |
If dbname is not supplied, then the DATABASE environment variable value is used.
pg_dump
has a few limitations. The limitations mostly stem from
difficulty in extracting certain meta-information from the
system catalogs.
rules and views
pg_dump does not understand user-defined rules and views and will fail to dump them properly. (This is due to the fact that rules are stored as plans in the catalogs and not textually)
partial indices
pg_dump does not understand partial indices. (The reason is the same as above. Partial index predicates are stored as plans)
large objects
pg_dump does not handle large objects. Large objects are ignored and must be dealt with manually.
To dump a database:
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pg_dump >db.out |
To reload it:
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psql -e database <db.out |
copy(l)
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pg_dump(1) | |