InterBase a replikacia
Honza Pazdziora
adelton na informatics.muni.cz
Středa Červenec 12 15:32:51 CEST 2000
On Fri, Jul 07, 2000 at 04:16:08PM +0200, Ladislav Dobias wrote:
>
> Muzu se zeptat: co je to replikace?
Manual rika:
Replication is the process of copying and maintaining
schema objects in multiple databases that make up
a distributed database system. Replication can improve the
performance and protect the availability of applications
because alternate data access options exist. For example,
an application can normally access a local database rather
than a remote server to minimize network traffic and achieve
the best performance. Furthermore, the application can
continue to function if the local server fails while
other servers with replicated data remain accessible. Oracle
supports two forms of replication: basic and advanced replication.
Jeden mozny pohled je, ze data jsou ulozena v lokalni kopii databaze,
takze pro ne nemusite pres sit. Servery si pak mezi sebou zajisti, ze
zmeny provedene v primarni databazi budou propagovany i na replikovane
kopie. Nicmene zmeny probihaji vzdy na primarnim miste. Druhy pohled
pak dovoluje pracovat temto databazim autonomne a periodicky ci jinak
provedene zmeny synchronizovat. Zde se pak zmeny delaji na vice
mistech, neexistuje primarni podoba dat.
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Honza Pazdziora | adelton na fi.muni.cz | http://www.fi.muni.cz/~adelton/
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