ticdc: Update migrate from tidb to tidb doc (#18675) (#18723)

pingcap · Aug 28, 2024 · 84da0c6 · 84da0c6
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diff --git a/migrate-from-tidb-to-tidb.md b/migrate-from-tidb-to-tidb.md
@@ -136,6 +136,10 @@ After setting up the environment, you can use the backup and restore functions o
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+    > **Note:**
+    >
+    > TiCDC `gc-ttl` is 24 hours by default. If the backup and restore takes a long time, the default `gc-ttl` might not be sufficient, which could cause the subsequent [incremental replication task](#step-3-migrate-incremental-data) to fail. To avoid this situation, adjust the `gc-ttl` value according to your specific needs when starting the TiCDC server. For more information, see [What is `gc-ttl` in TiCDC](/ticdc/ticdc-faq.md#what-is-gc-ttl-in-ticdc).
+
 2. Back up data.
 
     Run the `BACKUP` statement in the upstream cluster to back up data: