> > If you're really sure that the database files are identical, the easiest > way to do the replication would be to copy the WAL file. > > What processing do you want to do? >
I want to take note of changes and depending on data, I might replicate in some other DB. The database files are not necessarily identical. So mere copying wont help me. I should get the data from WAL and based on which table(can I get these info from WAL?) the data was changed, I should act accordingly. So the only way is to read page and extract information from it or any other way?? > Is there any other better way other than WAL? > > Record the SQL statements that are executed. This is one another case, where some optimization could happen, like for example if I run a update query and nothing gets updated in a particular table which is similar in 2 different databases, then WAL doesn't have any changes on that particular table and no need to execute the same query again in different DB! And I have some other use cases like those. So I would like to see the changes from WAL and based on changes and the query, I will proceed. So i need a better way to read the contents from the WAL. One of them is analyzing the pages from WAL, any others??. In PostgreSQL, for WAL, they have a module which will give summary of which row in a particular table was changed by reading the contents from WAL. Any module like that?? because my work will be easy if I get the info of changes that way!!
