* Bill Moran: > To clarify my viewpoint: > To my knowledge, there is no Unix filesystem that _suffers_ from > fragmentation. Specifically, all filessytems have some degree of > fragmentation that occurs, but every Unix filesystem that I am aware of > has built-in mechanisms to mitigate this and prevent it from becoming > a performance issue.
One database engine tends to create a huge number of fragments because the files are written with holes in them. There is a significant impact on sequential reads, but that doesn't matter much because the engine doesn't implement fast, out-of-order B-tree scans anyway. 8-/ I still think that preallocating in reasonably sized chunks is beneficial. -- Florian Weimer <[EMAIL PROTECTED]> BFK edv-consulting GmbH http://www.bfk.de/ Kriegsstraße 100 tel: +49-721-96201-1 D-76133 Karlsruhe fax: +49-721-96201-99 ---------------------------(end of broadcast)--------------------------- TIP 3: Have you checked our extensive FAQ? http://www.postgresql.org/docs/faq
