# [[guc:wal_writer_flush_after]]

> WAL writer 请求刷盘前累计写入的 WAL 量。
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WAL writer 请求刷盘前累计写入的 WAL 量。

[PostgreSQL 18 官方参数参考](https://www.postgresql.org/docs/18/runtime-config.html#GUC-WAL-WRITER-FLUSH-AFTER)

## 被哪些等待事件引用 {#wait-events}

- [LWLock/WALWrite](/zh/lwlock/wal-write/)