Is there any way to create triggers on different databases? my requirement is like:-
database: a1.db consist table: t1
database:a2.db consist table: t2
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What are the other databases you are using besides mysql? If Oracle is one of them, then you can create dblinks from Oracle to the other databases, and your trigger (running on Oracle) could use those dblinks to update the tables in the other databases.
You can refer to this link for info on creating dblinks in Oracle: http://download.oracle.com/docs/cd/B12037_01/server.101/b10759/statements_5005.htm
Also, see this link (How to create a DB link between two oracle instances) for another answer on stackoverflow.