Xref: alice comp.databases.oracle.misc:30488 Message-ID: <373002D9.A7EF258F@adr.it> Date: Wed, 05 May 1999 10:35:37 +0200 From: Francesco Dini X-Mailer: Mozilla 4.06 [en] (WinNT; I) MIME-Version: 1.0 Subject: Re: Fragmentation question. References: <7gagpa$1ia$1@emu.cs.rmit.edu.au> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Newsgroups: comp.databases.oracle.misc Lines: 20 Path: alice!news-feed.fnsi.net!news.maxwell.syr.edu!news-ge.switch.ch!serra.unipi.it!news.caspur.it!news.uni.net I think that horizontal fragmentation is that inside the row of a table: if a row is often updated it is possible for it to raise the problem of migration and chaining. I think that horizontal fragmentation is concerned about these two problems. Abhimanyu Parasher wrote: > Hi! > Thanks for reading this. I need an urgent help to understand the concept of data fragmentation in the case of ORACLE. > > What does Horizontal fragmentation mean in the case of ORACLE? Does it mean that we hold separate copies of fragmented tables in different databases ? Because, if it is like that then the constraint policy of Primary key wouldn't hold good on such kind of data. > So, what actually it means ? > > Please reply asap. > > Thanks > > Abhimanyu Parasher > > -- > > >