使用info命令查看链接数：
127.0.0.1:6379> info
# Clients connected_clients:1 client_longest_output_list:0 client_biggest_input_buf:0 blocked_clients:0 # Memory used_memory:7767543488 used_memory_human:7.23G used_memory_rss:8330784768 used_memory_rss_human:7.76G used_memory_peak:10680449296 used_memory_peak_human:9.95G used_memory_peak_perc:72.73% used_memory_overhead:3533621726 used_memory_startup:765512 used_memory_dataset:4233921762 used_memory_dataset_perc:54.51% total_system_memory:135084498944 total_system_memory_human:125.81G used_memory_lua:37888 used_memory_lua_human:37.00K maxmemory:0 maxmemory_human:0B maxmemory_policy:noeviction mem_fragmentation_ratio:1.07 mem_allocator:jemalloc-4.0.3 active_defrag_running:0 lazyfree_pending_objects:0
connected_clients:1 表示连接数为1