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ticdc: fix the description of safe-mode #13337

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merged 1 commit into from Apr 25, 2023
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ticdc: fix the description of safe-mode #13337

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2 changes: 1 addition & 1 deletion ticdc/ticdc-faq.md
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Expand Up @@ -231,7 +231,7 @@ From the result, you can see that the table schema before and after the replicat

Since v5.0.1 or v4.0.13, for each replication to MySQL, TiCDC automatically sets `explicit_defaults_for_timestamp = ON` to ensure that the time type is consistent between the upstream and downstream. For versions earlier than v5.0.1 or v4.0.13, pay attention to the compatibility issue caused by the inconsistent `explicit_defaults_for_timestamp` value when using TiCDC to replicate the time type data.

## Why do `INSERT`/`UPDATE` statements from the upstream become `REPLACE INTO` after being replicated to the downstream if I set `enable-old-value` to `true` when I create a TiCDC replication task?
## Why do `INSERT`/`UPDATE` statements from the upstream become `REPLACE INTO` after being replicated to the downstream if I set `safe-mode` to `true` when I create a TiCDC replication task?

TiCDC guarantees that all data is replicated at least once. When there is duplicate data in the downstream, write conflicts occur. To avoid this problem, TiCDC converts `INSERT` and `UPDATE` statements into `REPLACE INTO` statements. This behavior is controlled by the `safe-mode` parameter.

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