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文档 / PostgreSQL : Page Buffer Overview.pdf
PostgreSQL : Page Buffer Overview.pdf
张凡
20
21页
0次
2025-03-31
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IITM Pravartak Technologies Foundation
PostgreSQL: Page Buffer
Overview
This presentation provides an in-depth look into PostgreSQL pages. It
explores the buffer cache and the clock-sweep buffer eviction algorithm.
Understand how PostgreSQL manages data efficiently.
IITM Pravartak Technologies Foundation
Agenda: Understanding
PostgreSQL Pages
2
Page Structure
Delve into the structure of
PostgreSQL pages. Explore
how data is organized for
optimal access.
1
Buffer Cache
Learn about the buffer cache.
Understand its role in reducing
I/O delays.
4
Buffer Management
Examine the clock-sweep
algorithm. Discover how
PostgreSQL manages
memory.
3
Buffer Usage
View buffer usage during query
execution
IITM Pravartak Technologies Foundation
Page Buffer
Shared Memory Area
It stores data from physical files
into RAM. This avoids I/O delays.
Part of Shared Buffer Pool
Accessible to all PostgreSQL
processes. Ensures efficient data
sharing.
Cache Lookup
PostgreSQL checks buffer cache
for data. Returns data from cache if
available.
The page buffer is crucial for performance. It reduces the need to read from disk.
Configuration
Controlled by shared_buffers
parameter (default: 128 MB).
Initialization
InitBufTable in
backend/storage/buffer/freelist.c
of 21
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postgresql
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