1、Save
Redis Save 命令执行一个同步保存操作，将当前 Redis 实例的所有数据快照(snapshot)以 RDB 文件的形式保存到硬盘。
语法结构：
redis 127.0.0.1:6379> SAVE 保存成功时返回 OK 。
2、DBSIZE
用于查看当前数据库中key的数量。
语法结构：
127.0.0.1:6379> DBSIZE
3、Flushdb
Redis Flushdb 命令用于清空当前数据库中的所有 key。
语法结构：
redis 127.0.0.1:6379> FLUSHDB 成功时返回OK。
4、Flushall
Redis Flushall 命令用于清空整个 Redis 服务器的数据(删除所有数据库的所有 key )。
语法结构：
redis 127.0.0.1:6379> FLUSHALL 成功时返回 OK 。
5、Info
Redis Info 命令以一种易于理解和阅读的格式，返回关于 Redis 服务器的各种信息和统计数值。
语法结构：
redis 127.0.0.1:6379> INFO [section]返回字符串，文本行的集合。
127.0.0.1:6379[1]> info
# Server
redis_version:6.2.6
redis_git_sha1:00000000
redis_git_dirty:0
redis_build_id:677751d56f377af8
redis_mode:standalone
os:Linux 3.10.0-1160.el7.x86_64 x86_64
arch_bits:64
multiplexing_api:epoll
atomicvar_api:atomic-builtin
gcc_version:4.8.5
process_id:963
process_supervised:no
run_id:e56b6c589c0a3d4986bcab5e04536119b63963ef
tcp_port:6379
server_time_usec:1677720330864033
uptime_in_seconds:583826
uptime_in_days:6
hz:10
configured_hz:10
lru_clock:16775946
executable:/usr/local/redis/bin/redis-server
config_file:/usr/local/redis/bin/redis.conf
io_threads_active:0
# Clients
connected_clients:18
cluster_connections:0
maxclients:10000
client_recent_max_input_buffer:48
client_recent_max_output_buffer:0
blocked_clients:0
tracking_clients:0
clients_in_timeout_table:0
# Memory
used_memory:1255824
used_memory_human:1.20M
used_memory_rss:2879488
used_memory_rss_human:2.75M
used_memory_peak:12320416
used_memory_peak_human:11.75M
used_memory_peak_perc:10.19%
used_memory_overhead:1199192
used_memory_startup:829688
used_memory_dataset:56632
used_memory_dataset_perc:13.29%
allocator_allocated:1348568
allocator_active:1789952
allocator_resident:4210688
total_system_memory:1019572224
total_system_memory_human:972.34M
used_memory_lua:37888
used_memory_lua_human:37.00K
used_memory_scripts:296
used_memory_scripts_human:296B
number_of_cached_scripts:1
maxmemory:0
maxmemory_human:0B
maxmemory_policy:noeviction
allocator_frag_ratio:1.33
allocator_frag_bytes:441384
allocator_rss_ratio:2.35
allocator_rss_bytes:2420736
rss_overhead_ratio:0.68
rss_overhead_bytes:-1331200
mem_fragmentation_ratio:2.37
mem_fragmentation_bytes:1666432
mem_not_counted_for_evict:0
mem_replication_backlog:0
mem_clients_slaves:0
mem_clients_normal:369208
mem_aof_buffer:0
mem_allocator:jemalloc-5.1.0
active_defrag_running:0
lazyfree_pending_objects:0
lazyfreed_objects:0
# Persistence
loading:0
current_cow_size:0
current_cow_size_age:0
current_fork_perc:0.00
current_save_keys_processed:0
current_save_keys_total:0
rdb_changes_since_last_save:22
rdb_bgsave_in_progress:0
rdb_last_save_time:1677719716
rdb_last_bgsave_status:ok
rdb_last_bgsave_time_sec:0
rdb_current_bgsave_time_sec:-1
rdb_last_cow_size:503808
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
aof_last_write_status:ok
aof_last_cow_size:0
module_fork_in_progress:0
module_fork_last_cow_size:0
# Stats
total_connections_received:841
total_commands_processed:3172043
instantaneous_ops_per_sec:0
total_net_input_bytes:181088924
total_net_output_bytes:70113755
instantaneous_input_kbps:0.00
instantaneous_output_kbps:0.00
rejected_connections:0
sync_full:0
sync_partial_ok:0
sync_partial_err:0
expired_keys:188
expired_stale_perc:0.00
expired_time_cap_reached_count:0
expire_cycle_cpu_milliseconds:18260
evicted_keys:0
keyspace_hits:449
keyspace_misses:905
pubsub_channels:0
pubsub_patterns:0
latest_fork_usec:973
total_forks:47
migrate_cached_sockets:0
slave_expires_tracked_keys:0
active_defrag_hits:0
active_defrag_misses:0
active_defrag_key_hits:0
active_defrag_key_misses:0
tracking_total_keys:0
tracking_total_items:0
tracking_total_prefixes:0
unexpected_error_replies:0
total_error_replies:22
dump_payload_sanitizations:0
total_reads_processed:671487
total_writes_processed:722428
io_threaded_reads_processed:0
io_threaded_writes_processed:0
# Replication
role:master
connected_slaves:0
master_failover_state:no-failover
master_replid:681f9f7b26b16cbece8073a2143b3466f9e7313e
master_replid2:0000000000000000000000000000000000000000
master_repl_offset:0
second_repl_offset:-1
repl_backlog_active:0
repl_backlog_size:1048576
repl_backlog_first_byte_offset:0
repl_backlog_histlen:0
# CPU
used_cpu_sys:465.912570
used_cpu_user:168.563412
used_cpu_sys_children:0.945753
used_cpu_user_children:0.042433
used_cpu_sys_main_thread:507.849219
used_cpu_user_main_thread:123.724301
# Modules
module:name=bf,ver=20215,api=1,filters=0,usedby=[],using=[],options=[]
# Errorstats
errorstat_ERR:count=18
errorstat_EXECABORT:count=1
errorstat_NOSCRIPT:count=1
errorstat_WRONGTYPE:count=2
# Cluster
cluster_enabled:0
# Keyspace
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