On 5/13/2014 10:59 AM, Dimitry Sibiryakov wrote: > 10.05.2014 14:03, Vlad Khorsun wrote: >> As for A-B-A >> updates i see no problem as there will be 3 separate index entries with own >> tx numbers. Currently we also have 3 index entires for such scenario, btw. >> Old IB's optimization to not store existing key second time is not working in >> concurrent environment and easy allows to have missing entries. It was >> disabled in FB 2.0. > If I'm not mistaken, these repeating index entries works as a reference > counters and > allow to stop using staying list for indexes even in current code for the > same reason as > for blobs: three versions are enough for decision making. >
No, it only makes race conditions more elusive... This area needs to be rethought, gentlemen (and Ann). ------------------------------------------------------------------------------ "Accelerate Dev Cycles with Automated Cross-Browser Testing - For FREE Instantly run your Selenium tests across 300+ browser/OS combos. Get unparalleled scalability from the best Selenium testing platform available Simple to use. Nothing to install. Get started now for free." http://p.sf.net/sfu/SauceLabs Firebird-Devel mailing list, web interface at https://lists.sourceforge.net/lists/listinfo/firebird-devel
