# ERR unknown subcommand or wrong number of arguments for 'SLOWLOG'

- **ID:** `redis/err-unknown-subcommand`
- **Domain:** redis
- **Category:** runtime_error
- **Verification:** ai_generated
- **Fix Rate:** 90%

## Root Cause

Redis received an invalid subcommand or incorrect argument count for a valid command, often due to client library version mismatch or typo.

## Version Compatibility

| Version | Status | Introduced | Deprecated |
|---------|--------|------------|------------|
| Redis 6.2 | active | — | — |
| Redis 7.0 | active | — | — |
| Redis 7.2 | active | — | — |
| redis-py 4.5.0 | active | — | — |
| redis-py 5.0.0 | active | — | — |

## Workarounds

1. **Update the client library to a version compatible with your Redis server version. For example, in Python using redis-py, run: `pip install redis>=5.0.0`** (85% success)
   ```
   Update the client library to a version compatible with your Redis server version. For example, in Python using redis-py, run: `pip install redis>=5.0.0`
   ```
2. **Verify the correct subcommand syntax by checking the Redis documentation. For SLOWLOG, use: `SLOWLOG GET 10` instead of `SLOWLOG GETALL`.** (90% success)
   ```
   Verify the correct subcommand syntax by checking the Redis documentation. For SLOWLOG, use: `SLOWLOG GET 10` instead of `SLOWLOG GETALL`.
   ```
3. **In the client code, wrap the slow log command in a try-except and fall back to a known working subcommand. Example in Python: `try: r.execute_command('SLOWLOG', 'GET', 10) except redis.exceptions.ResponseError: r.execute_command('SLOWLOG', 'LEN')`** (75% success)
   ```
   In the client code, wrap the slow log command in a try-except and fall back to a known working subcommand. Example in Python: `try: r.execute_command('SLOWLOG', 'GET', 10) except redis.exceptions.ResponseError: r.execute_command('SLOWLOG', 'LEN')`
   ```

## Dead Ends

- **** — Restarting does not change the client command that triggered the error. (90% fail)
- **** — The client library still sends the same malformed command. (70% fail)
- **** — This is a workaround that sacrifices monitoring capabilities. (60% fail)