FLUSHALLDelete every key on every shard.
| 構文 | FLUSHALL |
| グループ | server |
| 引数の数 | -1 |
| 導入バージョン | 1.0.0 |
| フラグ | write |
| 計算量 | O(S) fan-out; per shard O(N/S) clear plus WATCH invalidation plus a feed-generation bump |
| Redis 互換性 | differs: ASYNC / SYNC are accepted and ignored (the flush is always synchronous per shard), and it bumps the CDC feed generation, so live FEED cursors get a resync error |