README
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上传日期:2007-01-07
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- 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.
- To build:
- % gmake clean install
- This version of the program will read in your postgreSQL database and
- output the schema and the data tuples in SQL. The dumps are useful
- for moving from one postgreSQL installation to another.
- How to use pg_dump:
- -------------------
- The command line options are fairly self explanatory. Use -help to
- see the command line options. recommend using -v to get
- more verbose descriptions of what pg_dump is doing.
- After running pg_dump, one should examine the output script file for any
- warnings, especially in light of the limitations listed below.
- A typical use of pg_dump:
- % pg_dump -v -f oldDB.dump oldDB
- % createdb newDB
- % psql newDB < oldDB.dump
- Caveats and limitations:
- ------------------------
- 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.
- oid preservation:
- pg_dump does not preserve oid's while dumping. If you have
- stored oid's explicitly in tables in user-defined attributes,
- and are using them as keys, then the output scripts will not
- regenerate your database correctly.
- pg_dump requires postgres95 beta0.03 or later.
- Bug-reporting
- --------------
- If you should find a problem with pg_dump, it is very important that
- you provide a (small) sample database which illustrates the problem.
- Please send bugs, questions, and feedback to the
- postgres95@postgres95.vnet.net