Redis user permissions (ACL) and python connection

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 Recently, I was working on setting up a redis cluster along with separate users for readwrite and readonly. I setup the readonly user using the below privileges (ACLs):   user redisreadonly on >mySuperSecretPassword ~* resetchannels -@all +@read +ping +asking   Once this is setup, I wrote a simple program in python to connect to the redis cluster using the readonly credentials and print the number of keys.   #!/usr/bin/env python3 """ pip3 install redis """ from redis.cluster import RedisCluster, ClusterNode # ─────── Cluster connection ─────── startup_nodes = [ ClusterNode("redis_host_1", 6379), ClusterNode("redis_host_2", 6379), ClusterNode("redis_host_3", 6379) ] rc = RedisCluster(startup_nodes=startup_nodes,decode_responses=True,username='redisreadonly',password='mySuperSecretPassw...
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Maximum number of Datafiles for an instance

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I'm back after a long hiatus! Hopefully, with stuff that you will all appreciate and use, in your day to day activities. So, here goes.

Objective

To find the maximum number of datafiles for a given instance (instance = database, both are interchangeable, unless we are talking of RAC).

Options

1. Using init file:

Check the parameter db_files.

e.g: SQL> show parameter db_files


2. Using control file:

Check the parameter MAXDATAFILES after generating the controlfile trace.

eg:

CREATE CONTROLFILE REUSE DATABASE "ORCL" NORESETLOGS ARCHIVELOG
MAXLOGFILES 64
MAXLOGMEMBERS 5
MAXDATAFILES 512
MAXINSTANCES 8
MAXLOGHISTORY 14607


3. Execute the below query in sqlplus:

SQL> select records_total from v$controlfile_record_section where type='DATAFILE';

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