事務存儲引擎 SimpleDBM

fmms 13年前發布 | 14K 次閱讀 Java 數據庫服務器

SimpleDBM是一個多線程的事務性存儲引擎，用Java編寫的。它有一個非常小的footprint，可嵌入到地址空間的申請。它提供了一個簡單的編程API ，可以非常快學到。 SimpleDBM支持ACID事務，steal/no-force 緩沖管理，鎖的并發性，行級鎖， B -樹索引，表格，收件領先日志，崩潰恢復，并死鎖檢測。

  1. Transactional - SimpleDBM fully supports ACID transactions. SimpleDBM uses a STEAL/NO-FORCE buffer management strategy for transactions.
  2. Multi-threaded - SimpleDBM is multi-threaded and supports concurrent reads and writes of data.
  3. Write Ahead Log - SimpleDBM uses a write ahead log to ensure transaction recovery in the event of system crashes.
  4. Lock based concurrency - SimpleDBM uses shared, update and exclusive locks to manage concurrency. Row locks are used.
  5. Multiple Isolation Levels - SimpleDBM supports read-committed, repeatable-read, and serializable isolation levels.
  6. B-Tree Indexes - SimpleDBM implements B-plus Tree indexes, that fully support concurrent reads, inserts and deletes. SimpleDBM B-Trees continually re-balance themselves, and do not suffer from fragmentation.
  7. Tables - SimpleDBM supports tables, but for maximum flexibility, treats table rows as blobs of data. Table rows can have any internal structure as you like, and can span multiple disk pages.
  8. Latches and Locks - SimpleDBM uses latches for internal consistency, and locks for concurrency. Latches are more efficient locking mechanisms that do not suffer from deadlocks.
  9. Deadlock detection - SimpleDBM has support for deadlock detection. A background thread periodically checks the lock table for deadlocks and aborts transactions to resolve deadlocks.
  10. Network API - A network client/server API is being developed and will be released soon!

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