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How to use Redis Databases

Redis, has by default 16 databases identified by an integer. To increase Redis performance, we can use different database for different environments or workloads.

( eg.: DEV = database 0, QA = database 1, PROD = database 2 )

This way we will prevent to scan the entire Redis default database by switching between different databases, we need to use SELECT statement and DB integer.

Commands

SELECT, DBSIZE, FLUSHDB

Example: switch between different databases

redis> SELECT 0
redis> SELECT 1
redis> SELECT 2

Example: to flush DEV database from Redis Cluster and keeps other databases intact

redis> SELECT 0
redis> FLUSHDB