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oceanbase / miniob

MiniOB is a compact database that assists developers in understanding the fundamental workings of a database.
https://oceanbase.github.io/miniob/
Mulan Permissive Software License, Version 2
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持久化功能 #376

Closed hnwyllmm closed 2 weeks ago

hnwyllmm commented 1 month ago

What problem were solved in this pull request?

Issue Number: close #118 #279

Problem: 当前的WAL仅记录了事务的日志，没有记录内部对象，比如record manager、B+树等的日志，导致在异常重启时，可能正常无法恢复。

What is changed and how it works?

除了记录事务日志，还记录了Buffer pool、record manager、B+树等内部数据日志，可以保证内部对象变更后断电等异常，仍然可以通过日志来恢复数据。

另外，此PR也实现了事务的回滚日志。