# [[guc:shared_buffers]]

> Size of PostgreSQL's shared buffer cache.
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Size of PostgreSQL's shared buffer cache.

[Official PostgreSQL 18 parameter reference](https://www.postgresql.org/docs/18/runtime-config.html#GUC-SHARED-BUFFERS)

## Referenced by wait events {#wait-events}

- [LWLock/BufferContent](/lwlock/buffer-content/)
- [LWLock/BufferMapping](/lwlock/buffer-mapping/)