How does replicate recover trail raw data to the true values?

How does replicate recover trail raw data to the true values?
or
How replicate use the trail file?
recover the trail file col values to a SQL?

user5834416 wrote:
How does replicate recover trail raw data to the true values?
or
How replicate use the trail file?
recover the trail file col values to a SQL?GoldenGate "capture" (extract) parses the redo/archive logs and writes out trail data in a GG-specific, database independent format. The trail contains changed-data events: inserts, updates & deletes (and optionally DDL events.) The GG replicat reads this data and converts the data to SQL to be applied to the target.
The GG trail files are not the same as the data as originally seen in the redo logs (GG is not doing any type of log-shipping of redo logs). The actual data in the trail isn't really important for end-users; it's an implementation detail (much like you shouldn't care what Oracle's redo log format is). But you can use "logdump" to inspect the contents of this (binary) file... again, kind of like LogMiner can be used to inspect archive logs.
There are a number of (conceptual) analogies one can draw between Oracle redo logs & GG trail files. But they're not the same. Your questions are mostly internal implementation details that are not really important for understanding how GoldenGate works. Nonetheless, it is useful to become familiar with logdump for advanced troubleshooting.
Good luck,
-m

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