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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