New FAQ item
От | Bruce Momjian |
---|---|
Тема | New FAQ item |
Дата | |
Msg-id | 199907100154.VAA28445@candle.pha.pa.us обсуждение исходный текст |
Ответы |
Re: [GENERAL] New FAQ item
(Howie <caffeine@toodarkpark.org>)
|
Список | pgsql-general |
Here is a new FAQ item that tries to answer the question of how PostgreSQL compares to other DBMS alternatives. Comments? --------------------------------------------------------------------------- 1.14) How does PostgreSQL compare to other DBMS's? There are several ways of measuring software: features, performance, reliability, support, and price. Features PostgreSQL has most features present in large commercial DBMS's, like transactions, subselects, and sophisticated locking. We have some features they don't have, like user-defined types, inheritance, rules, and multi-version concurrency control to reduce lock contention. We don't have foreign key referential integrity or outer joins, but are working on them for our next release. Performance PostgreSQL runs it two modes. Normal fsync mode flushes every completed transaction to disk, guaranteeing that if the OS crashes or looses power in the next few seconds, all your data is safely stored on disk. In this mode, we are slower than most commercial databases, partly because few of them do such conservative flushing to disk in their default modes. In no-fsync mode, we are usually faster than commercial databases, though in this mode, an OS crash could cause data corruption. We are working to provide an intermediate mode that suffers from less performance overhead than full fsync mode, and will allow data integrity within 30 seconds of an OS crash. The mode is select-able by the database administrator. In comparison to MySQL or leaner database systems, we are slower because we have transaction overhead. We are built for flexibility and features, not speed, though we continue to improve performance through profiling and source code analysis. Reliability We realize that a DBMS must be reliable, or it is worthless. We strive to release well-tested, stable code that has a minimum of bugs. Each release has at least one month of beta testing, and our release history shows that we can provide stable, solid releases that are ready for production use. We believe we compare favorably to other database software in this area. Support Our mailing list provides a large group of developers and users to help resolve any problems encountered. While we can not guarantee a fix, commercial DBMS's don't always supply a fix either. Direct access to developers, the user community, manuals, and the source code often make PostgreSQL support superior to other DBMS's. There is commercial per-incident support available for those who need it. (See support FAQ item.) Price We are free for all use, both commercial and non-commercial. You can add our code to your product with no limitations, except those outlined in our BSD-style license stated above. -- Bruce Momjian | http://www.op.net/~candle maillist@candle.pha.pa.us | (610) 853-3000 + If your life is a hard drive, | 830 Blythe Avenue + Christ can be your backup. | Drexel Hill, Pennsylvania 19026
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