DELDelete one or more keys.
| 语法 | DEL key [key ...] |
| 分组 | generic |
| 参数个数 | -2 |
| 起始版本 | 1.0.0 |
| 标志 | write |
| 复杂度 | O(N) keys, plus O(M) per key holding a collection of M elements (the drop walks the container) |
| Redis 兼容性 | differs: the multi-key form is split by shard and summed with no barrier, so it is not atomic across shards; the single-key form is |