Migrate from Redis to SSDB

Tools

The PHP script redis-import.php in tools/ directory is the script to copy data from a Redis instance to a SSDB instance.

Usage:

php redis-import.php redis_host redis_port redis_db ssdb_host ssdb_port

Options:

• redis_host: The IP address or hostname of Redis instance
• redis_port: The port number of Redis instance
• redis_db: Which Redis database(a number) you want to copy from
• ssdb_host: The IP address or hostname of SSDB instance
• ssdb_port: The port number of SSDB instance

Make sure you have the PHP Redis module https://github.com/nicolasff/phpredis installed.

Supported Redis Tools

SSDB vs Redis Commands

SSDB supports Redis network protocol, you can use Redis clients to connect to a SSDB server and operate on it.

But if you want to use SSDB clients, you will need this Redis-To-SSDB commands transfrom table.

Key-Value

Please read these notes very carefully:

• substr command is deprecated in Redis, so you should never use substr with a Redis client(however, you CAN do this, but MUST not do this)
• use getrange instead if you are sticking your mind with Redis
• notice the difference between substr(start, size) and getrange(start, end)
• when size is negative, the behavior may be strange for those who are not familiar with PHP language
• substr in SSDB works as described here

Key-Map(Hash)

If you want to delete a hash entirely, you have to use a SSDB client to execute hclear command. You cannot delete a hash with any Redis client.

Key-Zset

If you want to delete a zset entirely, you have to use a SSDB client to execute zclear command. You cannot delete a zset with any Redis client.

Key-List/Queue

If you want to delete a list entirely, you have to use a SSDB client to execute qclear command. You cannot delete a list with any Redis client.