Storage Engine Features¶

Access Methods¶

B+ Tree Implementation¶

• Multi-level tree structure for efficient range queries
• Support for internal and leaf pages
• Automatic page merging for empty nodes
• Overflow page support for large records

LSM Tree Implementation¶

• Write-optimized LSM tree backend
• Level-based compaction strategy
• Efficient range queries

Buffer Pool Manager¶

• Configurable buffer pool with page caching
• Replacement policies (LRU, Clock)
• Disk manager with persistent storage

Page Layout¶

• Size: System-dependent
• Byte Order: Little Endian (LSB)
• Format: Slotted pages for variable-size records
• Sorting: Logical sorting support
• Version Control: Magic numbers for file format versioning
• Right-Most Neighbor: Stored in page header for linked access

Transaction Support¶

• MVCC: Multi-Version Concurrency Control
• OCC: Optimistic Concurrency Control
• 2PL: Two-Phase Locking
• WAL: Write-Ahead Logging for durability
• Rollback: Comprehensive undo/rollback operations

Concurrency Control¶

• Clock replacement policy in buffer pool
• LRU replacement alternative
• Transaction isolation managers
• Deadlock detection via wait-for graphs