Re: Healthcare and Security/Privacy
"K. Ari Krupnikov" wrote: > > Add to this transactional integrity, referential intergrity and caching > that most RDBMSs (with the notable exception of MySQL, which in some > ppl's oppinion is an SQL wrapper around a filesystem) provide for free. Transactional support? Journaling with rollback. Referential integrity? Dirty region logging. Caching? Buffer/vnode caching? These things are available today in VxFS (for example). There are a lot of modern filesystems that owe more of their structure to the Stonebraker paper on The Design of the Postgres Storage System than they do to Maurice Bach's description of the Unix File System. There are a number of file oriented storage systems that provide anything from BASE to ACID semantics for transactions. There is an extensive chapter in the famous Gray, et al, text on Transaction Processing that addresses exactly these design issues. There have also been a number of file systems built on top of OS database services (see ErosOS, etc) over the years. The world does not start and end with UFS and FAT32. There are other technologies; work has been done. In any case, none of this is provided "for free." There are, as always, assorted design trade offs inherent in building any sort of storage subsystem. If you implement a two phase commit transactional model, there will be performance issues that need to be considered. This has the smell of a potential long term silly argument that could pollute this otherwise sparse and high signal to noise ratio mailing list. I recommend that those who are interested in a more fundamental understanding of the technologies underlying data storage seek the above references. Respectfully, -- Jack Rusher, Senior Software Engineer | mailto:jar@i... Integratus, Inc. | http://www.integratus.com
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