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. -- WBR, SD. ------------------------------------------------------------------------------ "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
