To retrieve all the items of a list with Redis, you do not need to iterate and fetch each individual items. It would be really inefficient. You just have to use the LRANGE command to retrieve all the items in one shot. elements = redis.lrange( “supplier_id”, 0, -1 ) will return all the items of … Read more
The colons have been in earlier redis versions as a concept for storing namespaced data. In early versions redis supported only strings, if you wanted to store the email and the age of ‘bob’ you had to store it all as a string, so colons were used: SET user:bob:email bob@example.com SET user:bob:age 31 They had … Read more
From here: eval “return #redis.pcall(‘keys’, ‘abc:*’)” 0 It’s not O(1), but at least the count is done on the server side.
Redis hashes are good for storing more complex data, like you suggest in your question. I use them for exactly that – to store objects with multiple attributes that need to be cached (specifically, inventory data for a particular product on an e-commerce site). Sure, I could use a concatenated string – but that adds … Read more
In short – for each redis object, there is an expiration time. Unless you set the object to expire, that time is “never”. Now, the expiration mechanism itself is semi-lazy. Lazy expiration means that you don’t actually expire the objects until they are read. When reading an object, we check its expiration timestamp, and if … Read more
And, if you’d like a quick option, run: redis-server –daemonize yes.
There is no native way of doing this. The Redis command documentation contains no native commands for getting the key and value of multiple keys. The most native way of doing this would be to load a lua script into your redis using the SCRIPT LOAD command or the EVAL command. Bash Haxx solution A … Read more
Part of this is answered here, but this isn’t completely a duplicate, as you’re asking about allowed characters as well as conventions. As for valid characters in Redis keys, the manual explains this completely: Redis keys are binary safe, this means that you can use any binary sequence as a key, from a string like … Read more
To disable all data persistence in Redis do the following in the redis.conf file: Disable AOF by setting the appendonly configuration directive to no (it is the default value). like this: appendonly no Disable RDB snapshotting by commenting all of the save configuration directives (there are 3 that are defined by default) and explicitly disabling … Read more
So my solution to my own problem: After playing around with redis-cli a bit longer I found out that DEBUG OBJECT <key> reveals something like the serializedlength of key, which was in fact something I was looking for… For a whole database you need to aggregate all values for KEYS * which shouldn’t be too … Read more