Re: D-ISAM, anybody?

Path: emory!swrinde!elroy.jpl.nasa.gov!usc!wupost!spool.mu.edu!munnari.oz.au!mel.dit.csiro.au!yarra!bohra.cpg.oz.au!mark From: mark@bohra.cpg.oz.au (Mark Chesterfield) Newsgroups: comp.databases.informix Keywords: C-ISAM D-ISAM Informix compatible NOT Message-ID: <1992Feb11.075120.14764@bohra.cpg.oz.au> Date: 11 Feb 92 07:51:20 GMT References: <1992Feb5.082442.5059@infoac.rmi.de> <1992Feb6.022434.9493@informix.com> Organization: Computer Power Software aland@informix.com (Colonel Panic) writes: >In article <1992Feb5.082442.5059@infoac.rmi.de> dseismo@infoac.rmi.de (Lennartz Electronic ) writes: [deleted] >>I am considering moving to a product called D-ISAM which is supposed to >>be compatible with C-ISAM at the file and call level, and it is available >heh heh heh... read the fine print; there's plenty. No 4.X or 5.X version >compatibility. Version 3.X "compatibility" omits transaction support >and clustering. It's basically billed as C-ISAM 2.11 compatible; C-ISAM >2.11 is, what, 8 years old? (It's what the pre-SQL products, e.g. Informix >3.3 and File-It 1.X, are built on). Their ads don't say what locking >methods they support, or whether any choices are built-in to the code. Their current release product doesn't support decimal data types or transaction logging, but they have a beta release which has this functionality which means that it appears to be compatible with C-ISAM 3.10 and probably the XPG3 ISAM spec. (I'm not sure about the clustering) The source code they supply supports lockf and locking library calls. We've a copy of the beta version of D-ISAM and it seems to work ok. We've only tried it in a test environment, not production. It does appear to be at least 20-35% slower than C-ISAM, but since they provide source I'm sure it would be possible to improve this for a specific application. >>in (purportedly portable) Unix source. We've run it ok on a Pyramid, Sun 4, and RS/6000. >>Also, it can be distributed without >>royalties (in compiled form). Not quite true. Your initial license includes the right to distribute 100 run-time copies. I believe that an unlimited run-time licence is about US $5000. >The license itself is quite clear and straightforward. >>I'd like to hear educated opinions on that subject ;-) Maybe :-) -- Mark Chesterfield Phone: +61-3-8230222 CP Software Fax: +61-3-8220089 19 Cato Street, East Hawthorn, ACSnet: mark@bohra.cpg.oz[.au] Victoria, Australia, 3123 UUCP: ...uunet!munnari!bohra.cpg.oz.au!mark