redis move all keys - redis

Question

is it possible to use redis's MOVE command to move all keys from 1 database to another? The move command only moves 1 key, but I need to move all the keys in the database.

Answer 1

I would recommend taking a look at the following alpha version app to backup and restore redis databases.. (you can install it via gem install redis-dump). You could redis-dump your databaseand then redis-load into another database via the --database argument.
redis-dump project
If this doesn't fit your purposes, you may need to make use of a scripting language's redis bindings (or alternatively throw something together using bash / redis-cli / xargs, etc). If you need assistance along these lines then we probably need more details first.

Answer 2

I've wrote a small python script to move data between two redis servers:(only support list and string types, and you must install python redis client):
'''
Created on 2011-11-9
#author: wuyi
'''
import redis
from optparse import OptionParser
import time
def mv_str(r_source, r_dest, quiet):
keys = r_source.keys("*")
for k in keys:
if r_dest.keys(k):
print "skipping %s"%k
continue
else:
print "copying %s"%k
r_dest.set(k, r_source.get(k))
def mv_list(r_source, r_dest, quiet):
keys = r_source.keys("*")
for k in keys:
length = r_source.llen(k)
i = 0
while (i<length):
print "add queue no.:%d"%i
v = r_source.lindex(k, i)
r_dest.rpush(k, v)
i += 1
if __name__ == "__main__":
usage = """usage: %prog [options] source dest"""
parser = OptionParser(usage=usage)
parser.add_option("-q", "--quiet", dest="quiet",
default = False, action="store_true",
help="quiet mode")
parser.add_option("-p", "--port", dest="port",
default = 6380,
help="port for both source and dest")
parser.add_option("", "--dbs", dest="dbs",
default = "0",
help="db list: 0 1 120 220...")
parser.add_option("-t", "--type", dest="type",
default = "normal",
help="available types: normal, lpoplist")
parser.add_option("", "--tmpdb", dest="tmpdb",
default = 0,
help="tmp db number to store tmp data")
(options, args) = parser.parse_args()
if not len(args) == 2:
print usage
exit(1)
source = args[0]
dest = args[1]
if source == dest:
print "dest must not be the same as source!"
exit(2)
dbs = options.dbs.split(' ')
for db in dbs:
r_source = redis.Redis(host=source, db=db, password="", port=int(options.port))
r_dest = redis.Redis(host=dest, db=db, password="", port=int(options.port))
print "______________db____________:%s"%db
time.sleep(2)
if options.type == "normal":
mv_str(r_source, r_dest, options.quiet)
elif options.type == "lpoplist":
mv_list(r_source, r_dest, options.quiet)
del r_source
del r_dest

Answer 3

you can try my own tool, rdd
it's a command line utility,
can dump database to a file, work on it (filter, match, merge, ...), and back it in a redis instance
take care, alpha stage, https://github.com/r043v/rdd/

Answer 4

Now that redis has scripting using lua, you can easily write a command that loops through all the keys, checks their type and moves them accordingly to a new database.

Answer 5

I suggest you can try it as below:
1. copy the rdb file to another dir;
2. modify the rdb file name;
3. modify the redis configure file adapter to the new db;