> On Sun, Jan 27, 2013 at 3:23 PM, Dimitry Sibiryakov <s...@ibphoenix.com > <mailto:s...@ibphoenix.com>> wrote: > > 27.01.2013 21:17, Thomas Steinmaurer wrote: > > Is Firebird able here to serve the result here out of the index > or does > > it need to lookup data by following the index key to the row data? > > There is no data in index. And no information about transaction > created an index entry. > So, yes, Firebird has to look at real data. > > > Just to amplify Dimitry's answer, without transaction information, > there's no way to tell whether an index entry points to a record version > that's appropriate to your transaction. So even if you find an index > entry that exactly matches the data you want, you still have to read the > record.
Makes sense. How does the engine know when to garbage collect an index entry? Thanks, Thomas ------------------------------------------------------------------------------ Master Visual Studio, SharePoint, SQL, ASP.NET, C# 2012, HTML5, CSS, MVC, Windows 8 Apps, JavaScript and much more. Keep your skills current with LearnDevNow - 3,200 step-by-step video tutorials by Microsoft MVPs and experts. ON SALE this month only -- learn more at: http://p.sf.net/sfu/learnnow-d2d Firebird-Devel mailing list, web interface at https://lists.sourceforge.net/lists/listinfo/firebird-devel
