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Buffer Manager

Agent skill
1 skill
READMEOverview ↓

PostgreSQL's shared-buffer manager — src/backend/storage/buffer/bufmgr.c — the 8 KB shared-memory page cache underneath every heap/index read. Covers pin/unpin lifecycle, BufferDesc + hash table, clock-sweep replacement, BufferAccessStrategy (ring buffers for VACUUM / bulk read / bulk write), local buffers for temp tables, and pinning discipline. Loads when the user asks about sharedbuffers sizing, pin/unpin semantics, buffer-pin deadlock scenarios, adding a new BufferAccessStrategy ring, BufferDesc state bits (VALID / DIRTY / IOINPROGRESS), the clock-sweep replacement algorithm, or debugging "buffer leak" WARNINGs. Skip when the ask is about the AIO layer sitting between shmem and disk (see aio-readstream) or about visibility/hint bits (see the sibling idiom hint-bits-setbufferdirty).

Install with
Claude CodeCodexCursorGitHub CopilotGemini CLI

Supported by the Atlas install prompt. Skill-specific requirements vary.

Skill stats

Skills1CategoryEngineeringStars0

About this skill

PostgreSQL's shared-buffer manager — src/backend/storage/buffer/bufmgr.c — the 8 KB shared-memory page cache underneath every heap/index read. Covers pin/unpin lifecycle, BufferDesc + hash table, clock-sweep replacement, BufferAccessStrategy (ring buffers for VACUUM / bulk read / bulk write), local buffers for temp tables, and pinning discipline. Loads when the user asks about sharedbuffers sizing, pin/unpin semantics, buffer-pin deadlock scenarios, adding a new BufferAccessStrategy ring, BufferDesc state bits (VALID / DIRTY / IOINPROGRESS), the clock-sweep replacement algorithm, or debugging "buffer leak" WARNINGs. Skip when the ask is about the AIO layer sitting between shmem and disk (see aio-readstream) or about visibility/hint bits (see the sibling idiom hint-bits-setbufferdirty).

Quick start

  1. Copy the install prompt. Use the green button above this README.
  2. Send it to your agent. Paste it into your coding agent’s chat and send.
  3. Review the setup. Your agent checks the skill’s instructions, requirements, and installation scope.

Installation guide →

Review, license & listing details
Review the source before using this skill

This is an imported listing. We haven’t certified its safety, license, or compatibility. Skills may include executable scripts.

Automated security scan: Partial

Only SKILL.md was scanned. Supporting files and scripts were not checked. No safety grade has been assigned.

0 potential findings · Scanned 11/4/2026 · Scanner 0.2.1

Content SHA-256: c5192bb19b692f3ad3a9a9fe5f1be279d20372e57b1d770f9f332c1926ea5d52

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Original listing metadata

Original name

buffer-manager

Original description

PostgreSQL's shared-buffer manager — `src/backend/storage/buffer/bufmgr.c` — the 8 KB shared-memory page cache underneath every heap/index read. Covers pin/unpin lifecycle, BufferDesc + hash table, clock-sweep replacement, BufferAccessStrategy (ring buffers for VACUUM / bulk read / bulk write), local buffers for temp tables, and pinning discipline. Loads when the user asks about `shared_buffers` sizing, pin/unpin semantics, buffer-pin deadlock scenarios, adding a new BufferAccessStrategy ring, `BufferDesc` state bits (VALID / DIRTY / IO_IN_PROGRESS), the clock-sweep replacement algorithm, or debugging "buffer leak" WARNINGs. Skip when the ask is about the AIO layer sitting between shmem and disk (see `aio-readstream`) or about visibility/hint bits (see the sibling idiom `hint-bits-setbufferdirty`).

About this listing

Category
Engineering
Reported license
PostgreSQL
Listing language (estimated)
English
Review status
Not individually reviewed
Agent compatibility
Atlas installation supports Claude Code, Codex, and Cursor. Skill-specific dependencies and features are checked during setup.
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