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查看Redis數(shù)據(jù)庫數(shù)量,快如閃電(redis查看數(shù)據(jù)庫數(shù)量)

查看Redis數(shù)據(jù)庫數(shù)量,快如閃電

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Redis是一個(gè)開源的、基于內(nèi)存的Key-Value存儲(chǔ)系統(tǒng),它支持高效地存儲(chǔ)、訪問和操作數(shù)據(jù)。Redis支持多個(gè)數(shù)據(jù)庫,每個(gè)數(shù)據(jù)庫可以存儲(chǔ)多個(gè)鍵值對(duì)。對(duì)于需要管理多個(gè)數(shù)據(jù)庫的Redis實(shí)例,我們需要了解如何查看Redis數(shù)據(jù)庫的數(shù)量,以便更好地管理和維護(hù)Redis實(shí)例。

在Redis中,可以使用SELECT命令來切換到不同的數(shù)據(jù)庫。默認(rèn)情況下,Redis實(shí)例有16個(gè)數(shù)據(jù)庫,編號(hào)從0到15??梢允褂肧ELECT命令選擇任意一個(gè)數(shù)據(jù)庫,如下所示:

127.0.0.1:6379> SELECT 0
OK

上述例子中,我們選擇了編號(hào)為0的數(shù)據(jù)庫,Redis返回了OK表示切換成功。我們可以通過使用INFO命令來查看當(dāng)前Redis實(shí)例的配置信息,其中包含了各個(gè)數(shù)據(jù)庫的信息。如下所示:

127.0.0.1:6379> INFO
# Server
redis_version:4.0.9
redis_git_sha1:00000000
redis_git_dirty:0
redis_build_id:7367f10e86256f38
redis_mode:standalone
os:Linux 5.3.0-24-generic x86_64
arch_bits:64
multiplexing_api:epoll
atomicvar_api:atomic-builtin
gcc_version:7.4.0
process_id:3497
run_id:289eea48b85e6152b21c1a001d0669d2b2793965
tcp_port:6379
uptime_in_seconds:5147
uptime_in_days:0
hz:10
lru_clock:2066750
executable:/usr/local/bin/redis-server
config_file:/usr/local/etc/redis/redis.conf
# Clients
connected_clients:1
client_longest_output_list:0
client_biggest_input_buf:0
blocked_clients:0

# Memory
used_memory:897240
used_memory_human:876.12K
used_memory_rss:1073152
used_memory_rss_human:1.02M
used_memory_peak:912304
used_memory_peak_human:890.60K
used_memory_peak_perc:98.36%
used_memory_overhead:763480
used_memory_startup:791808
used_memory_dataset:133760
used_memory_dataset_perc:23.87%
total_system_memory:15723710464
total_system_memory_human:14.64G
used_memory_lua:37888
used_memory_lua_human:37.00K
maxmemory:0
maxmemory_human:0B
maxmemory_policy:noeviction
mem_fragmentation_ratio:1.20
mem_allocator:jemalloc-5.1.0

# Persistence
loading:0
rdb_changes_since_last_save:0
rdb_bgsave_in_progress:0
rdb_last_save_time:1578956319
rdb_last_bgsave_status:ok
rdb_last_bgsave_time_sec:0
rdb_current_bgsave_time_sec:-1
rdb_last_cow_size:0
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

# Stats
total_connections_received:6
total_commands_processed:8
instantaneous_ops_per_sec:0
total_net_input_bytes:784
total_net_output_bytes:14705
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:0
expired_stale_perc:0.00
expired_time_cap_reached_count:0
evicted_keys:0
keyspace_hits:0
keyspace_misses:0
pubsub_channels:0
pubsub_patterns:0
latest_fork_usec:595
migrate_cached_sockets:0
# Replication
role:master
connected_slaves:0
master_replid:ef6c0678676aa5f9ac46b5d5b2e13b17a89b6a3d
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:0.28
used_cpu_user:0.07
used_cpu_sys_children:0.00
used_cpu_user_children:0.00

# Cluster
cluster_enabled:0
# Keyspace
db0:keys=1,expires=0,AVG_TTL=0
db1:keys=0,expires=0,avg_ttl=0
db2:keys=0,expires=0,avg_ttl=0
db3:keys=0,expires=0,avg_ttl=0
db4:keys=0,expires=0,avg_ttl=0
db5:keys=0,expires=0,avg_ttl=0
db6:keys=0,expires=0,avg_ttl=0
db7:keys=0,expires=0,avg_ttl=0
db8:keys=0,expires=0,avg_ttl=0
db9:keys=0,expires=0,avg_ttl=0
db10:keys=0,expires=0,avg_ttl=0
db11:keys=0,expires=0,avg_ttl=0
db12:keys=0,expires=0,avg_ttl=0
db13:keys=0,expires=0,avg_ttl=0
db14:keys=0,expires=0,avg_ttl=0
db15:keys=0,expires=0,avg_ttl=0

上述列表中,我們可以看到各個(gè)數(shù)據(jù)庫中鍵值對(duì)的數(shù)量、過期時(shí)間等信息。其中db0數(shù)據(jù)庫中有1個(gè)鍵值對(duì),其他數(shù)據(jù)庫中為0。

除了使用INFO命令查看數(shù)據(jù)庫信息外,我們還可以使用Redis的命令行界面redis-cli來查看Redis數(shù)據(jù)庫數(shù)量。在命令行中輸入以下命令即可:

$ redis-cli info keyspace

執(zhí)行上述命令后,Redis會(huì)返回所有數(shù)據(jù)庫中鍵值對(duì)的數(shù)量,如下所示:

db0:keys=1,expired=0,evicted=0,avg_ttl=0
db1:keys=0,expired=0,evicted=0,avg_ttl=0
db2:keys=0,expired=0,evicted=0,avg_ttl=0
db3:keys=0,expired=0,evicted=0,avg_ttl=0
db4:keys=0,expired=0,evicted=0,avg_ttl=0
db5:keys=0,expired=0,evicted=0,avg_ttl=0
db6:keys=0,expired=0,evicted=0,avg_ttl=0
db7:keys=0,expired=0,evicted=0,avg_ttl=0
db8:keys=0,expired=0,evicted=0,avg_ttl=0
db9:keys=0,expired=0,evicted=0,avg_ttl=0
db10:keys=0,expired=0,evicted=0,avg_ttl=0
db11:keys=0,expired=0,evicted=0,avg_ttl=0
db12:keys=0,expired=0,evicted=0,avg_ttl=0
db13:keys=0,expired=0,evicted=0,avg_ttl=0
db14:keys=0,expired=0,evicted=0,avg_ttl=0
db15:keys=0,expired=0,evicted=0,avg_ttl=0

可以看到,這種方法比使用INFO命令更加簡(jiǎn)潔,并且執(zhí)行速度更快。

除了通過命令行界面來查看Redis數(shù)據(jù)庫數(shù)量外,我們還可以使用Redis的客戶端庫來實(shí)現(xiàn)相同的功能。例如,在Python中,我們可以使用redis-py來連接Redis實(shí)例,并使用info()命令來獲取Redis數(shù)據(jù)庫信息。如下所示:

“`python

import redis

# 連接Redis

r = redis.Redis(host=’localhost’, port=6379, db=0)

# 獲取Redis數(shù)據(jù)庫信息

info = r.info(section=’keyspace’)

for key, value in info.items():

# 獲取數(shù)據(jù)庫編號(hào)

db_num = key.split(‘:’)[0]

# 獲取鍵值對(duì)數(shù)量

num_keys = value.get(‘keys’, 0)

print(f’db{db_num}:keys={num_keys}’)


執(zhí)行上述Python代碼后,我們可以看到Redis實(shí)例中各個(gè)數(shù)據(jù)庫中鍵值對(duì)的數(shù)量。這種方法不

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標(biāo)題名稱:查看Redis數(shù)據(jù)庫數(shù)量,快如閃電(redis查看數(shù)據(jù)庫數(shù)量)
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