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當我嘗試設置密鑰時，出現「OOM command not allowed」， maxmemory設置爲500M，maxmemory-policy「volatile-lru」，我爲發送給redis的每個密鑰設置TTL。如何在Redis中調試錯誤「使用內存時不允許使用OOM命令>'maxmemory'」？
INFO命令返回：used_memory_human:809.22M
- 如果maxmemory設置爲500M，我怎麼會達到809M？
INFO命令不顯示任何密鑰空間，它怎麼可能？KEYS *返回「（空列表或設置）」，我試圖改變分貝數，仍然沒有找到鑰匙。
這裏是信息命令輸出：
redis-cli -p 6380
redis 127.0.0.1:6380> info
# Server
redis_version:2.6.4
redis_git_sha1:00000000
redis_git_dirty:0
redis_mode:standalone
os:Linux 2.6.32-358.14.1.el6.x86_64 x86_64
arch_bits:64
multiplexing_api:epoll
gcc_version:4.4.7
process_id:28291
run_id:229a2ee688bdbf677eaed24620102e7060725350
tcp_port:6380
uptime_in_seconds:1492488
uptime_in_days:17
lru_clock:1429357
# Clients
connected_clients:1
client_longest_output_list:0
client_biggest_input_buf:0
blocked_clients:0
# Memory
used_memory:848529904
used_memory_human:809.22M
used_memory_rss:863551488
used_memory_peak:848529192
used_memory_peak_human:809.22M
used_memory_lua:31744
mem_fragmentation_ratio:1.02
mem_allocator:jemalloc-3.0.0
# Persistence
loading:0
rdb_changes_since_last_save:0
rdb_bgsave_in_progress:0
rdb_last_save_time:1375949883
rdb_last_bgsave_status:ok
rdb_last_bgsave_time_sec:-1
rdb_current_bgsave_time_sec:-1
aof_enabled:0
aof_rewrite_in_progress:0
aof_rewrite_scheduled:0
aof_last_rewrite_time_sec:-1
aof_current_rewrite_time_sec:-1
aof_last_bgrewrite_status:ok
# Stats
total_connections_received:3
total_commands_processed:8
instantaneous_ops_per_sec:0
rejected_connections:0
expired_keys:0
evicted_keys:0
keyspace_hits:0
keyspace_misses:0
pubsub_channels:0
pubsub_patterns:0
latest_fork_usec:0
# Replication
role:master
connected_slaves:0
# CPU
used_cpu_sys:18577.25
used_cpu_user:1376055.38
used_cpu_sys_children:0.00
used_cpu_user_children:0.00
# Keyspace
redis 127.0.0.1:6380>
這個答案對我非常有用：http://stackoverflow.com/a/22511091/1972282 –