Help Center/ GaussDB/ Centralized_8.x/ Storage Engine/ Ustore/ Storage Format/ UB-Tree

Updated on 2024-06-07 GMT+08:00

View PDF

UB-Tree

The B-tree is enhanced as follows, which is referred to as UB-tree.

Transaction information is added to UB-tree indexes, and MVCC can be performed independently. The proportion of IndexOnlyScan is increased, greatly reducing the number of times that the table is queried by TABLE ACCESS BY INDEX ROWID.
VACUUM is not the only way to clear historical data. Spaces are recycled independently. Indexes are decoupled from heap tables and can be cleared independently. The I/O stability is better.

RCR UB-Tree
PCR UB-Tree

Parent topic: Storage Format

Previous topic: RCR Uheap Free Space Management

Next topic: RCR UB-Tree

Feedback

Was this page helpful?

Helpful Not helpful

Provide feedback

Thank you very much for your feedback. We will continue working to improve the documentation.See the reply and handling status in My Cloud VOC.

The system is busy. Please try again later.

Which of the following issues have you encountered?

Content is inconsistent with the product UI

Unclear descriptions

Lack of examples or code

Incorrect steps

Can't find what I need

Lack of best practices

Feedback (optional)

0/500

Select at least one type of issue, and enter your comments or suggestions.

Enter a maximum of 500 characters.

Submit Cancel

For any further questions, feel free to contact us through the chatbot.