# [[guc:wal_writer_flush_after]]

> Amount of WAL written before the WAL writer requests a flush.
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Amount of WAL written before the WAL writer requests a flush.

[Official PostgreSQL 18 parameter reference](https://www.postgresql.org/docs/18/runtime-config.html#GUC-WAL-WRITER-FLUSH-AFTER)

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

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