redis里可以显示key大小的shell脚本,很方便的定位redis里有哪些大key。
脚本内容如下:
# cat redis-print-keysize.sh
#!/usr/bin/env bash
human_size() {
awk -v sum="$1" ' BEGIN {hum[1024^3]="Gb"; hum[1024^2]="Mb"; hum[1024]="Kb"; for (x=1024^3; x>=1024; x/=1024) { if (sum>=x) { printf "%.2f %s\n",sum/x,hum[x]; break; } } if (sum<1024) print "1kb"; } '
}
#redis_cmd='redis-cli'
redis_cmd='redis-cli -n 10'
# get keys and sizes
for k in `$redis_cmd keys "*"`; do key_size_bytes=`$redis_cmd debug object $k | perl -wpe 's/^.+serializedlength:([\d]+).+$/$1/g'`; size_key_list="$size_key_list$key_size_bytes $k\n"; done
# sort the list
sorted_key_list=`echo -e "$size_key_list" | sort -n`
# print out the list with human readable sizes
echo -e "$sorted_key_list" | while read l; do
if [[ -n "$l" ]]; then
size=`echo $l | perl -wpe 's/^(\d+).+/$1/g'`; hsize=`human_size "$size"`; key=`echo $l | perl -wpe 's/^\d+(.+)/$1/g'`; printf "%-10s%s\n" "$hsize" "$key";
fi
done
脚本说明:
扫描哪个db，修改脚本里对应redis_cmd的位置,加入 -n选项，例如：
# redis-cli info keyspace | grep db10
db10:keys=6,expires=0,avg_ttl=0
显示db10的里的6个key的大小:
将redis_cmd='redis-cli'改为redis_cmd='redis-cli -n 10'
运行:
# ./redis_key_sizes.sh
1kb prod_domain_error
1kb prod_solr_error
200.86 Kb test_buffer_error
241.55 Kb prod_comment_error
19.20 Mb prod_ref_15_error
70.55 Mb prod_ref_151_error
