What is interesting is that CHECKSUM became really practical in MySQL land when replication issues happen to be likable part of operation. So replication and checksum are kinda going hand in hand for "more that one box" infrastructures. Shouldn't Gearman pick up the bill as "persistent" data consistency checker across multiple servers along side with query analyzer? Maxim Volkov
On Wed, Aug 19, 2009 at 06:31, Sheeri K. Cabral <[email protected]> wrote: > On Tue, Aug 18, 2009 at 3:20 PM, David Axmark<[email protected]> > wrote: > > On Tue, 2009-08-18 at 07:33 -0700, Jay Pipes wrote: > > > >> The Google Protobuffer message format I will propose is as follows: > >> > >> message Checksum > >> { > >> required uint32 checksum; /* crc32 value */ > >> repeated string table; /* contains table_list or table_identifier */ > >> } > > > > BTW, most resonable numbers we choose 15 years ago from MySQL did not > > look that good 15 years later. > > > > And I am sure a 32 bit value here will look silly in 15 years. A 64/128 > > bit will be as fast to compute. And if you have enough data one in 4 > > billion may not sound as the best odds. > > > > My 2 cents: > > Allow checksumming partial data sets -- rows *and* columns. (there > are times we've found non-matching data in a column, but wanted to > continue checksums of the rest of the columns to ensure they're all in > sync while we worked on fixing the non-matching data). > > Allow a pluggable algorithm, so that the algorithm can change. With > mk-table-checksum, there are 2 algorithms besides the CHECKSUM, and > one of them may give false positives; the other is not order > dependent, so the rows (1,2) and (2,1) checksum to the same value. > > -- > - Sheeri K. Cabral > > http://tinyurl.com/mysqlbook will take you to the Amazon.com page for > my book, "MySQL Administrator's Bible". > > _______________________________________________ > Mailing list: https://launchpad.net/~drizzle-discuss > Post to : [email protected] > Unsubscribe : https://launchpad.net/~drizzle-discuss > More help : https://help.launchpad.net/ListHelp >
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