-
Notifications
You must be signed in to change notification settings - Fork 3.7k
branch-3.0: [improvement](statistics)Support auto analyze columns that haven't been analyzed for a long time. #42399 #45281
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.
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
Merged
Conversation
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
…en analyzed for a long time. (#42399) Support auto analyze columns that haven't been analyzed for a long time. Add a very low priority job queue for auto analyze to process this kind of columns. The purpose of this change is to make sure all tables could be auto analyzed within a certain time. In the earlier Doris versions, users often encounter this kind of issues: User load some new data to a large table everyday, but the change rate (percentage of new data) is very low, because there is a large size of old data. In this case, auto analyze for this table will not be triggered for a very long time, because the default trigger threshold of auto analyze is 40% (more than 40% of the data in a table is changed since last analyze). This will probably cause a bad plan because min/max/ndv statistics are outdated.
|
Thank you for your contribution to Apache Doris. Please clearly describe your PR:
|
|
run buildall |
TPC-H: Total hot run time: 40218 ms |
TPC-DS: Total hot run time: 195842 ms |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Cherry-picked from #42399