Today I Learned
  • Today I Learned
  • Database
    • Intro to Database Systems
      • Advanced SQL
      • Database Storage
        • Disk oriented Architecture
        • Storage Hierarchy
        • Disk-oriented DBMS
        • Why not use the OS?
        • Storage manager
        • Database Pages
        • Record IDs
        • Tuple layout
      • Database storage II
        • Log-structured file organization
        • Tuple storage
        • Postgres: numeric
        • Large value
        • External value storage
        • System catalogs
        • Observation
        • OLTP
        • OLAP
        • N-ARY STORAGE MODEL (NSM)
        • Decomposition storage model (DSM)
        • Tuple Identification
      • Buffer Pool & Memory management
        • Buffer pool organization
        • Buffer pool meta-data
        • Page Table vs. Page Directory
        • Allocation Polocies
        • Buffer Pool Optimizations
          • Multiple Buffer Pools
          • Pre-Fetching
          • Scan Sharing
        • Buffer Pool Bypass
        • OS Page Cache
        • Buffer Replacement Policies
        • Least-Recently Used
        • Clock
        • Problems
        • Better Policies: LRU-K
        • Better Policies: Localization
        • Better Policies: Priority Hints
        • Dirty Pages
        • Background Writing
      • Hash Table
        • Hash tables
          • Chain hashing
          • Extendible hashing
          • Linear hashing
      • Tree indexes I
        • Table indexes
        • B+ Tree
          • Properties
          • Nodes
        • B-Tree vs. B+Tree
        • Cluster indexes
        • Selection conditions
        • Node size
        • Merge threshold
        • Non-Unique indexes
        • Intra-node search
        • Prefix compression
        • Suffix truncation
        • Bulk insert
        • Pointer swizziling
      • Tree Indexes II
        • B+Tree: Duplicate Keys
        • Implicit Indexes
        • Partial Indexes
        • Covering Indexes
        • Index Include Columns
        • Functional/Expression Indexes
        • Observation
        • Trie Index
          • Trie Index Properties
          • Trie key span
          • Radix Tree
          • Observation
        • Inverted Index
        • Query Types
        • Design decisions
      • Multi-Threaded Index Concurrency Control
        • Locks vs. Latches
        • Latch modes
        • Latch implementations
        • Hash table latching
        • B+ Tree concurrency control
        • Latch crabbing/coupling
        • Leaf node scans
        • Page 5
      • Sorting & Aggregations
        • External Merge Sort
          • 2-Way External Merge Sort
        • Using B+ Trees For Sorting
          • Case #1 - Clustered B+ Tree
          • Case #2 - Unclustered B+ Tree
        • Aggragations
          • Sorting aggregation
          • Alternatives to sorting
          • Hashing aggregate
  • Back-end
    • Docker
      • Basic cmd
    • Network
      • The internet
        • Protocol Stacks and Packets
        • Networking Infrastructure
        • Internet Infrastructure
        • The Internet Routing Hierarchy
        • Application Protocols: HTTP and the World Wide Web
        • Transmission Control Protocol
        • Internet Protocol
    • Programming Languages
      • Compiled vs Interpreted
  • Personal
    • Reflections on the Tiny Things I Learned in
      • 2023
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  1. Database
  2. Intro to Database Systems
  3. Buffer Pool & Memory management

Buffer pool meta-data

PreviousBuffer pool organizationNextPage Table vs. Page Directory

Last updated 3 years ago

The page table keeps track of pages that are currently in memory

Also maintains additional meta-data per page:

  • Dirty flag

  • Pin/Reference Counter