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In MySQL replication, what does the replica's I/O thread do?

  1. A Applies events to the replica's tables
  2. B Reads events from the source's binary log into the local relay log
  3. C Writes to the source's binary log
  4. D Performs backups
Answer

Reads events from the source's binary log into the local relay log

The I/O thread fetches events into the relay log and a separate applier (SQL) thread replays them, which is why lag can occur in either stage.

All MySQL MCQs

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