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In redis, select "number" gives access to specific database at that index. I my redis config it is set 16(why ?). We require high scaling of our application so what is the max limit for that?
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Out of the box, a Redis instance supports 16 logical databases.
Redis comes with support for multiple databases, which is very similar to the concept in SQL databases. In SQL databases, such as MySQL, PostgreSQL, and Oracle, you can define a name for your databases. However, Redis databases are represented by numbers.
Redis can handle up to 2^32 keys, and was tested in practice to handle at least 250 million keys per instance. Every hash, list, set, and sorted set, can hold 2^32 elements. In other words your limit is likely the available memory in your system.
In practical terms, Redis databases should be used to separate different keys belonging to the same application (if needed), and not to use a single Redis instance for multiple unrelated applications. When using Redis Cluster, the SELECT command cannot be used, since Redis Cluster only supports database zero.
The default number of databases in Redis is 16，index：0~15。You can edit your redis.conf file to adjust this number:
Steps：
1）edit config file
vi /etc/redis.conf
Default config path is
/etc/redis.confon Centos when installed with Yum.
2）find keyword："databases"
# Set the number of databases. The default database is DB 0, you can select
# a different one on a per-connection basis using SELECT <dbid> where
# dbid is a number between 0 and 'databases'-1
databases 16
databases 16：16 is the default on new installations
3）Update the number of databases：
databases 30
4）end，save and quit
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