Re: [firebird-support] Re: Firebird Embedded open database file on network share
On Jan 22, 2015, at 5:06 AM, ralf.erdm...@web.de [firebird-support] firebird-support@yahoogroups.com wrote: So I now know I had no good idea with the network share :-) I hope I made that clear :-) I thought it possible because I read that firebird embedded is at most the same engine as the firebird server. It is. But the Shared Server has a single process mediating all physical access to the database file and the Classic Server uses interprocess communication to avoid physical access conflicts. The Embedded Engine mediates conflicts between connections it makes, but has no way to detect the existence of other Embedded Engines accessing the file through a network share. Good luck, Ann
[firebird-support] Common Table Expressions (“WITH ... AS ... SELECT”)
Hi to all, I am in the process of writing a list of entries with running costs in a quarter and all costs that have arsien since. So, I wrote a stored procedure with the mathematical logic for calculating the respective sums with different rates of exchange and some other rules. I made this procedure flexible so that it either returns all costs for a given period (e.g. quarter) or all costs until a certain point of time. The resulting structure for the lists basically looks like this: with costs_in_period as (select cp1.file_id, cp1.costs as costsinquarter from cost_procedure (periodfrom,periodto) cp1) select cp2.file_id, cip.costsinquarter, cp2.costs as costssofar from cost_procedure (null,periodto) cp2 left join costs_in_period cip on cip.file_id = cp2.file_id I now have about 7000 cases and both queries incividually take about 2-5 minutes to query. But when I now use the above given CTE structure I killed the running transaction after 5 hours running time. I thought that firebird does nothing else as individually running the two queries and then joining them. But it seems to me that it queries the CTE for each entry in the main query. Am I making something wrong and/or is there a better way of doing that? Kind regards and thanks for an answer in advance Christian
Re: [firebird-support] Re: Firebird Embedded open database file on network share
On 22 Jan 2015 01:06:28 -0800, ralf.erdm...@web.de [firebird-support] firebird-support@yahoogroups.com wrote: Thanks Ann. So I now know I had no good idea with the network share :-) I thought it possible because I read that firebird embedded is at most the same engine as the firebird server. But obviously I didn't thought about such implications. The engine is the same, and Firebird server would have the exact same problem if you would attempt to let multiple Firebird server instances access the same database from a network share. If you want to access a Firebird database over a network, use a single Firebird server instance. Mark
Re: [firebird-support] Re: Unicode text in Exception?
btw, in Firebird 3, the RDB$EXCEPTIONS.RDB$MESSAGE is still NONE. Oh bugger. Now, I tried the following in the procedure to work around the above: exception test _utf8 'unicode string here'; When I look at RDB$PROCEDURES.RDB$PROCEDURE_SOURCE I can see the text is inserted as a hex string. But this doesn't seem to work either? Does this work at all with Exceptions? AFAIU, your trick (exception parameter) should work. Hmm, I'm puzzled then, cause it doesn't seem to work at first sight. With regards, Martijn Tonies Upscene Productions http://www.upscene.com Download Database Workbench for Oracle, MS SQL Server, Sybase SQL Anywhere, MySQL, InterBase, NexusDB and Firebird! Posted by: Martijn Tonies (Upscene Productions) m.ton...@upscene.com ++ 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
Re: [firebird-support] Re: Firebird Embedded open database file on network share
Thanks Ann. So I now know I had no good idea with the network share :-) I thought it possible because I read that firebird embedded is at most the same engine as the firebird server. But obviously I didn't thought about such implications. Thanks to all who took time to help me, Ralf
Re: [firebird-support] Unlock record
I looked in a database, and in MON$STATEMENTS tabla I have the following fields: MON$STATEMENT_ID MON$ATTACHMENT_ID MON$TRANSACTION_ID MON$STATE MON$TIMESTAMP MON$SQL_TEXT MON$STAT_ID How can I detect which is the record I have to delete to unlock my record? This is the only table I have to modify? I typically just look at the mon$sql_text with a mon$timestamp that seems to be the correct one. HTH, Set Mensaje original --- May be I can modify or delete some record in any MON$ table or do some other thing? I typically locate and delete records from MON$STATEMENTS. Mind you, that is 2.5 and typically when I have a long- running query. Don't know whether deleting from this table is possible or safe with 2.1 or sensible WITH LOCK.
