Page Table

The Page Table is a critical component within the Buffer Pool Manager of industrial machinery and computing systems, serving as a centralized registry that maintains metadata for all pages currently stored in the buffer pool. It maps logical page identifiers to physical buffer frame locations, tracks page states (clean/dirty, pinned/unpinned), records access patterns, and manages page replacement policies. This component enables efficient memory allocation, reduces disk I/O operations, and optimizes system performance by providing rapid access to frequently used data pages.

The Page Table operates on hash table or array-based indexing principles, where each entry corresponds to a page in the buffer pool. When a page request occurs, the Page Table quickly locates the page using its unique identifier. It implements algorithms like LRU (Least Recently Used) or Clock to track page usage and determine which pages to evict when the buffer pool is full. The table maintains synchronization through locking mechanisms to ensure data consistency in multi-threaded industrial environments.