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Show slow Redis commands (SLOWLOG)

harmlessRedis and Memcacheddebian, ubuntu
Adjust the values, the command updates live
user@server
redis-cli SLOWLOG GET 10

Prints the latest slowlog entries: sequence number, Unix timestamp, duration in microseconds and the command with its arguments. By default, everything that takes longer than 10 milliseconds is logged (slowlog-log-slower-than 10000). Typical culprits are KEYS *, large HGETALL calls or DEL on very large keys.

Note: Only the pure execution time inside Redis is measured, not network or waiting time. SLOWLOG RESET clears the log.

Also searched as

  • redis is slow
  • which redis commands are slow
  • read redis slowlog

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Show the Redis cache hit rate

$redis-cli INFO stats | grep -E '^(keyspace_hits|keyspace_misses|evicted_keys|expired_keys):'
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Check whether Redis is reachable

$redis-cli -h 127.0.0.1 -p 6379 ping
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Connect to Redis over a Unix socket

$redis-cli -s /run/redis/redis-server.sock ping
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Count Redis keys by pattern without blocking the server

$redis-cli -n 0 --scan --pattern '*transient*' | wc -l
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Count the keys in a Redis database

$redis-cli -n 0 DBSIZE
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Find the biggest keys in Redis

$redis-cli -n 0 --bigkeys
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