Ok, the name is not so important but call it recentCN but extended sample ------------------------------
Is this possible that this CN(commit number) of transactions (pair transaction id + CN) can be stored into some table? Is it possible to retrive most recent CN from transaction start point (call this recentCN). It can provide simple way to retrive new records/changes in tables (new feature). E.g. whe can then do SELECT * FROM TABLEX WHERE CN>:recentCN; I know this do not show us deleted records but in many scenarios it is not so important. Of course deleted records can also be tracked, if we block record versions to be removed by garbage collector and make way to retrive this record with some flag(?). But this then require something what init this blocking mechanism (i suppose this will be then simmilar feature to so called in Interbase Change Views). What do you think about? ------------------------------- and about already existing RDB$RECORD_VERSION This is not the same. consider: Transaction id=1 is active and have modified some records in TableX Transaction id=2 start transaction 1 commit transaction 2 try fetch new changed data(delta) by issuing SELECT * FROM TableX WHERE RDB$RECORD_VERSION>2 it do not get records modified by tr id=1 because it looks for changes by RDB$RECORD_VERSION>2 with this select SELECT * FROM TABLEX WHERE CN>:recentCN; it will be see it :) regards, Karol Bieniaszewski ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot Firebird-Devel mailing list, web interface at https://lists.sourceforge.net/lists/listinfo/firebird-devel
