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Buffer Manager

Category: Engineering  ·  Sub-category: backend  ·  Last updated:
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`).
Security AStatic scan found no risk patternsHow grading works ›

From the source SKILL.md

Every read of any heap or index page in PG goes through the buffer manager. It maintains an in-memory cache (sized by shared_buffers) of 8 KB pages, indexed by (rlocator, forknum, blocknum). Pins reserve a buffer for a caller; refcount → 0 lets the clock-sweep evictor pick it as a replacement candidate.

What this skill does

Buffer Manager is a community-contributed Claude Code skill in the backend sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/buffer-manager/ and loads when your prompt matches the skill's trigger.

Who uses this skill

The Buffer Manager Claude Code skill is built for software engineers, backend developers, full-stack teams, and technical leads building and maintaining production systems. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 158,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/buffer-manager
curl -L https://claudskills.com/skills/buffer-manager/SKILL.md \
  -o ~/.claude/skills/buffer-manager/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/buffer-manager/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/buffer-manager/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\buffer-manager\SKILL.md on Windows. See the full install guide for step-by-step instructions.

Telegram

📱 Install from your phone or desktop Telegram

Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

Pro

For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.

See pricing → Download desktop app

Frequently asked questions

How do I install the Buffer Manager Claude Code skill?
Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/buffer-manager/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.
What does the Buffer Manager skill do?
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`).
Is this skill free to install?
Yes. ClaudSkills is an open registry — every skill keeps its source repository's license, and manual install via copy is free. ClaudSkills Pro ($9/mo, $79/yr, or $149 one-time) adds one-click install via the desktop app and a multi-signal Quality Score.
When should I use the Buffer Manager skill?
Use Buffer Manager when your Claude Code task falls under the Engineering category — specifically in the backend area. Claude Code auto-discovers installed skills and invokes the right one based on the task description, so you can also ask Claude directly (e.g. "use Buffer Manager" or describe the task and let Claude pick). Browse related skills at /category/engineering/.
What is a Claude Code skill and how does the Buffer Manager skill fit in?
A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Buffer Manager is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Engineering category. Learn more at /learn/what-is-a-claude-skill/.

Attribution & license

Cite this skill

If you reference this skill in a blog post, paper, or documentation, you can cite it as:

APA
matejformanek. (2026). Buffer Manager [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/buffer-manager/
BibTeX
@misc{buffer-manager-2026,
  author    = {matejformanek},
  title     = {Buffer Manager [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/buffer-manager/}
}

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Grade A · scanned 2026-07-23 — free static scan against the OWASP Agentic Skills Top 10.

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Browse all Engineering skills in the ClaudSkills registry, or explore these other picks from the same category:

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