Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Fix broken link in DM best practices (#18918) #18919

Merged
merged 1 commit into from
Sep 18, 2024
Merged

Fix broken link in DM best practices (#18918) #18919

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
2 changes: 1 addition & 1 deletion dm/dm-best-practices.md
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -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
Expand Down
Loading