From 9976374991862ba6bdd0f798eac2790af6bb6790 Mon Sep 17 00:00:00 2001 From: Ti Chi Robot Date: Wed, 18 Sep 2024 10:33:15 +0800 Subject: [PATCH] Fix broken link in DM best practices (#18918) (#18923) --- dm/dm-best-practices.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/dm/dm-best-practices.md b/dm/dm-best-practices.md index dddfb81835afe..28f8c4439225f 100644 --- a/dm/dm-best-practices.md +++ b/dm/dm-best-practices.md @@ -99,7 +99,7 @@ The following table summarizes the pros and cons of optimistic mode and pessimis | Scenario | Pros | Cons | | :--- | :--- | :--- | -| Pessimistic mode (Default) | It can ensure that the data migrated to the downstream will not go wrong. | If there are a large number of shards, the migration task will be blocked for a long time, or even stop if the upstream binlogs have been cleaned up. You can enable the relay log to avoid this problem. For more information, see [Use the relay log](#use-the relay-log). | +| Pessimistic mode (Default) | It can ensure that the data migrated to the downstream will not go wrong. | If there are a large number of shards, the migration task will be blocked for a long time, or even stop if the upstream binlogs have been cleaned up. You can enable the relay log to avoid this problem. For more information, see [Use the relay log](#use-the-relay-log). | | Optimistic mode| Upstream schema changes will not cause data migration latency. | In this mode, ensure that schema changes are compatible (check whether the incremental column has a default value). It is possible that the inconsistent data can be overlooked. For more information, see [Merge and Migrate Data from Sharded Tables in Optimistic Mode](/dm/feature-shard-merge-optimistic.md#restrictions).| ### Other restrictions and impact