Verbose :) -----Ursprüngliche Nachricht----- Von: firebird-support@yahoogroups.com [mailto:firebird-support@yahoogroups.com] Gesendet: Freitag, 8. Januar 2016 16:30 An: firebird-support@yahoogroups.com Betreff: Re: [firebird-support] Small Database with very very bad performance on LAN
Hello, > Hallo, > I have a small database (less 100MB) that works on Firebird 2.5.5 > SS64bit over a machine with Win7 64bit with 4GB Ram, CPU Pentium G620. > > I seems to work very well in local but with the 3 clients on LAN works > very bad. It is very very slow to open and navigate a simple table > with less of 5.000 rows! > > What i can do? You have to sort out where your current bottleneck is. Can you pin-point it to a particular query or is performance in general bad? With Firebird 2.5, you have quite some monitoring amory, e.g. monitoring tables (tables starting with MON$...) or the Trace API. Try to get a big picture with that tooling to see what's going, statement execution plans etc..., I/O statistics, e.g. is data being fetched from disk or served from the Firebird cache, which I doubt with your page buffers value below. > > I very novice in Firebird. > > The result of gstat is: > Database header page information: > Flags 0 > Checksum 12345 > Generation 26613 > Page size 4096 > ODS version 11.2 > Oldest transaction 26603 > Oldest active 26604 > Oldest snapshot 26604 > Next transaction 26605 > Bumped transaction 1 > Sequence number 0 > Next attachment ID 139 > Implementation ID 26 > Shadow count 0 > Page buffers 0 > Next header page 0 > Database dialect 3 > Creation date Jan 4, 2016 15:44:10 > Attributes force write > > Variable header data: > Sweep interval: 20000 > *END* With SuperServer and a page size of 4096 and a page buffers set of 0, which gets overriden with a default value of 2048 from firebird.conf (if not specified otherwise), you end up with a Firebird page cache of 8MB (!) only for your database. Increase "Page buffers" to e.g. 10000 (e.g. with gfix command-line tool), then re-connect your client application and see if this helps. There is other tuning stuff, but as a first step increasing the Firebird page cache + getting a big picture on your slow statements, their execution plan probably pointing to missing indexes ... is a good start. Good luck. -- With regards, Thomas Steinmaurer http://www.upscene.com/ Professional Tools and Services for Firebird FB TraceManager, IB LogManager, Database Health Check, Tuning etc. ------------------------------------ ------------------------------------ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Visit http://www.firebirdsql.org and click the Documentation item on the main (top) menu. Try FAQ and other links from the left-side menu there. Also search the knowledgebases at http://www.ibphoenix.com/resources/documents/ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ------------------------------------ Yahoo Groups Links
