[Hello, The firebird manual says that generators are thread-safe [1]. How does the firebird engine guarantee that two consecutive executions of a "SELECT NEXT VALUE FOR..." do not return the same value? Does it use a lock on the RDB$GENERATOR table? Does the call to "SELECT NEXT VALUE..." block, when another thread is reading/writing into it? Would that mean that having multiple clients connected and issuing these commands simultaneously degrade the performance of the database?
My application case is the following: I want to append a column to some tables in my database representing an "update counter". Whenever an insert or update command is issued, this field will be incremented (globally for the whole database). [1] http://www.firebirdsql.org/file/documentation/reference_manuals/user_manuals/html/generatorguide-basics.html -- Matheus Degiovani Gigatron Software e Treinamentos Ltda. (18) 3649-4045 MSN: [email protected] -- CrĂticas ou Sugestões? Ligue para Ouvidoria Gigatron: (18) 3649-4048 ------------------------------------ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Visit http://www.firebirdsql.org and click the Resources item on the main (top) menu. Try Knowledgebase and FAQ links ! Also search the knowledgebases at http://www.ibphoenix.com ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/firebird-support/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/firebird-support/join (Yahoo! ID required) <*> To change settings via email: [email protected] [email protected] <*> To unsubscribe from this group, send an email to: [email protected] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
