When AWS SCT Unable to Connect to MySQL in RDS or EC2

AWS Schema Conversion Tool (SCT) is one of the must tool for a successful migration of databases to AWS RDS.

If you are trying to connect to MySQL hosted on EC2 instance or RDS and unable to make the connection despite of setting the security groups correctly and making sure that port, hostname, username and password are right, then first check the log of SCT.

Monitoring Database in AWS Aurora After Migrating from Oracle to PostgreSQL

Suppose you have an Oracle database on-premise, which you have now moved over to AWS Cloud in AWS Aurora PostgreSQL. 

AWS Support Knowledge Center

In addition to AWS documentation and blogs, one of the best resource is AWS Knowledge Center. It contains frequently asked questions from AWS customers so this resource contains real world problems with their solution.

Updating Oracle Opatch with AWS Systems Manager Run Command at Scale

AWS Systems Manager (SSM) is a managed service by AWS, which is used to configure and manage EC2 instances, other AWS resources, and on-premise VMs/servers at scale. SSM frees you up from having ssh or bastion host access to the remote resources.

awk -F option

I often need to extract subset of data from one command so that it could be used in another during the DBA tasks performed through shell scripts.

One such requirement is that when you need to feed the name of ASM disks to the querydisks command.

Step by Step Installation of PostgreSQL 11 on Oracle Linux 7

This is quick spit-out of commands, I used on my test virtual machine to install PostgreSQL 11 on Oracle Enterprise Linux 7.

Quickly Download Oracle Software From My Oracle Support

In order to quickly download Oracle software from My Oracle Support (MOS) to your server or local host, you must have curl or wget installed.

Check these by using:

[oracle@test working]$ which curl
/usr/bin/curl
[oracle@test working]$ which wget
/usr/bin/wget

Goldengate ERROR OGG-02037 Failed to retrieve the name of a missing Oracle redo log.

One extract got abended and wasn't able to start in Oracle Goldengate Version 12.2.0.1.160517 23194417_FBO. The redologs were present but extract was still abended and threw following error in the report file.

Error:

ERROR OGG-02037 Failed to retrieve the name of a missing Oracle redo log.

Solution:

Graceful Stop of Goldengate Extract

It's always a good idea to stop extracts after checking if there is any long running transaction in the database being captured. Failing to do so might later result in hung or unstable processes.

Step by Step: Ansible Role To Setup Oracle ACFS On Multiple Nodes

This post contains step by step instructions for creating an Ansible role acfssetup to setup Oracle ASM Cluster Filesystem (ACFS) on multiple nodes of a cluster. This assumes that Grid Infrastructure 12.1.0.2.0 is already installed on the nodes, and ASM is working fine. This also assumes that there already is Ansible installed on some controller host with ssh equivalency setup between root and Oracle users.