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I want to use the wal2json extension to capture the changes in the PostgreSQL database. I need to find the diff between old and new rows. Having searched the Internet for an answer, I realized that this can be achieved by setting the REPLICA IDENTITY FULL option on the table of interest.

I think this is exactly what I need, but I wonder are there any significant drawbacks of this setting?

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The only disadvantage is that it will produce more data than are necessary to identify the affected row, but since that is what you want, it is not a disadvantage to you.

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