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A simple script to print the size of all your Redis keys.
#!/usr/bin/env bash
# This script prints out all of your Redis keys and their size in a human readable format
# Copyright 2013 Brent O'Connor
# License: http://www.apache.org/licenses/LICENSE-2.0
human_size() {
awk -v sum="$1" ' BEGIN {hum[1024^3]="Gb"; hum[1024^2]="Mb"; hum[1024]="Kb"; for (x=1024^3; x>=1024; x/=1024) { if (sum>=x) { printf "%.2f %s\n",sum/x,hum[x]; break; } } if (sum<1024) print "1kb"; } '
}
redis_cmd='redis-cli'
# get keys and sizes
for k in `$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
@rndbblnn
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rndbblnn commented Jan 9, 2018

FYI: the script doesn't work if you're using Redis on AWS Elasticache, 'redis-cli debug' command not supported.

@guoruibiao
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guoruibiao commented Jul 17, 2019

guys, you have info command with total memory usage. iterating all keys with ineffective keys * is not a good approach.

that's really a bad idea by using this script on product environment. Maybe using scan command to get the keys by application, and then apply this script can get a better efficientily.

@andrewbrg
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andrewbrg commented Oct 30, 2019

guys, you have info command with total memory usage. iterating all keys with ineffective keys * is not a good approach.

that's really a bad idea by using this script on product environment. Maybe using scan command to get the keys by application, and then apply this script can get a better efficientily.

Agree

@navi2589
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navi2589 commented Dec 4, 2019

what does that -e does in echo?

@epicserve
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Author

epicserve commented Dec 4, 2019

@navi2589, Try running the following and see what it does.

echo -e "Blah\nFoo\n\nBar"

@sg552
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sg552 commented Jan 14, 2020

it doesn't work on ubuntu 18.

Just calculate the size by your brain, the serializedsize unit is 'byte', so 1024 = 1k, 1024000 = 1MB

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