linguoxuan opened a new pull request, #4364:
URL: https://github.com/apache/flink-cdc/pull/4364

   ## Purpose
   
   During the snapshot split reading phase, `initStatement()` sets `autoCommit` 
to `false` on the JDBC
   connection to enable cursor-based result set fetching. However, after the 
split read completes, the transaction is never committed and `autoCommit` is 
never restored to `true`. This may lead to idle transactions leak.
   
   ## Change
   
   Added a `finally` block in `createDataEventsForTable()` of 
`Db2ScanFetchTask`, `OracleScanFetchTask`, `PostgresScanFetchTask`, and 
`SqlServerScanFetchTask` to restore `autoCommit` to `true` after each snapshot 
split read.


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