lecture19~24 #10
Merged
lecture19~24 #10
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
Pull reviewers statsStats of the last 30 days for SSAMBBONG:
|
bapdung
approved these changes
Jul 4, 2024
MustSave
approved these changes
Jul 5, 2024
김연욱/[lecture19] mvcc (1부)/README.md
Outdated
| ## postgreSQL의 MVCC Lost Update | ||
|
|
||
| - 변경된 값에 대해서 덮어 쓰게 되는 경우(lost update)가 발생할 수 있음 | ||
| - postgreSQL에서 repeatable read 레벨은 같은 데이터에 먼저 update한 tx이 commit되면 나중 tx는 rollback된다는 특징이 있음 (first-updater-win) |
Contributor
There was a problem hiding this comment.
repeatable read만 first updater win이 적용되나?
Contributor
Author
There was a problem hiding this comment.
serializable에서도 적용되지 않나?
Contributor
There was a problem hiding this comment.
모든 isolation level에서 first committer winner 되지 않아?
그게 MVCC 기본 특징이잖아
김연욱/[lecture20] mvcc (2부)/README.md
Outdated
|
|
||
| - 변경된 값에 대해서 덮어 쓰게 되는 경우(lost update)가 발생할 수 있음 | ||
| - MySQL에서의 for update 문을 추가해서 해결! | ||
| - Locking read : MySQL에서 for update를 의미 (locking read는 가장 최근의 commit된 데이터를 읽음!!) |
Contributor
There was a problem hiding this comment.
Locking read에는 for shared도 해당될걸
Co-authored-by: MustSave <58774251+MustSave@users.noreply.github.com>
Co-authored-by: MustSave <58774251+MustSave@users.noreply.github.com>
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Outdated suggestions cannot be applied.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.
과제 수행 여부
사유 (미완료 시)
(이유를 간단히 설명해주세요)
관련 문서나 이슈
(관련된 문서나 이슈가 있다면 링크를 제공해주세요)