Blog | Pythian | Database (18)

Oracle

Automating Oracle RMAN backup configuration on Linux with Ansible

Having valid backup of the databases is one of the most important tasks for every DBAs. Having proper RMAN backup ...

MySQL

Understanding MySQL isolation levels: repeatable-read

Isolation levels are a rare subject in MySQL literature. The documentation provides a terse description and focuses ...

Oracle

How to patch an exadata (part 2) - cells, IB and DB servers

Quick links to Part 1 / Part 2 / Part 3 / Part 4 / Part 5 / Part 6 3: The patching procedure 3.1 Patching the Cells ...

MySQL

MySQL crashes on DDL statement: a lesson on purge threads

Restructuring your database environments can be a high-stakes operation. Recently, I’ve encountered several reports of ...

Oracle

Orphaned disks in OVM and what to do with them

Some time ago I was doing a maintenance on an OVM and noticed that it had significant number of disks without mapping ...

Oracle E-Business Suite

Oracle E-Business Suite and Java Web Start. Finally!

Great things always happen overnight. That's probably the case for European Oracle Apps DBAs in the same situation, ...

Oracle

How to patch an exadata (part 5) - troubleshooting

Quick links to Part 1 / Part 2 / Part 3 / Part 4 / Part 5 / Part 6 5: Troubleshooting In this post I'll be sharing a ...

Oracle

Oracle GoldenGate microservices architecture - first try.

Three or four months ago Oracle released a new 12.3 version of the Oracle GoldenGate (OGG) software. The release did ...

Oracle

Sending email from Oracle with utl_smtp via Amazon Simple Email Service (SES)

Note: This article was updated following Symantec Trust issues earlier in 2018.

Oracle

How to patch an exadata (part 1) - introduction and prerequisites

Once you have installed your new Exadata machine will come a time where you'll be asked : "shouldn't we patch the ...

Oracle

Oracle database upgrade on RDS AWS and SPM baselines

Introduction A couple of days ago I saw a question posted online asking about how AWS upgrades an RDS Oracle database ...

Oracle

Oracle 12.2 ASM filter driver installation

Recently I needed to install Oracle 12.2 with the ASM Filter Driver for some research on an upcoming presentation. With ...

Database

Updating Elasticsearch indexes with Spark

With the extensive adoption of Elasticsearch as a search and analytics engine, more often we build data pipelines that ...

Microsoft SQL Server

Multi Tb migration using mydumper

In this post I will explain how to transfer a multi terabyte size database between two MySQL instances using mydumper, ...

Oracle

Oracle Scheduler fail to send email notifications

Introduction In this blog post I would like to share an interesting issue we encountered couple of months ago related ...

Oracle

Oracle service secrets: more performance with less load-balancing

A huge but often overlooked aspect of tuning cluster databases is workload management. That means controlling on which ...

Oracle

Upgrade existing TDE to use new unified key management in 12c Upgraded Database (non-cdb)

I'm really excited to be writing this post and I'm hoping it serves as helpful content. When reviewing the new ...

Oracle

Simple steps to perform opatch maintenance with Ansible

Like the Universe, IT growth seems to be infinite, we always have more environments, more servers, more users, more ...

Oracle

Standardizing the Oracle GoldenGate Home Path (OGG_HOME)

Introduction I don't work with Oracle GoldenGate extensively but when I do I find it somewhat remarkable that there ...

MySQL

Change of database passwords through OEM

Changing passwords for system database accounts is a necessary but often tedious routine. However, with Oracle ...

Oracle

Automating password rotation for Oracle databases

Password rotation is not the most exciting task in the world, and that's exactly why it's a perfect candidate for ...

Oracle

Locating most current record using ROW_NUMBER() vs. Index Full Scan (Min/Max)

Very often when reading data, we need to locate the most current record for a set of conditions. One typical example is ...

Oracle

Automation, PowerShell and Word Templates - let the technician do tech

In my work as a Database Consultant, I enjoy technical challenges, but it's always a painful process when I need to ...

Oracle

Cloning Oracle grid infrastructure using Ansible

Sometimes your organization may decide to move to new hardware, to a new data center, and you, as an Oracle DBA, would ...

Microsoft SQL Server

How to analyze SQL server stack dumps

Troubleshooting SQL server stack dumps: A practical guide As a SQL Server production DBA, at some point in time you ...

Microsoft SQL Server

Dbatools and a SQL Agent

The mission: Tell every DBA around the world about a secret formula that will give them powers. What power do you think ...

Data Migration

Database migration using Apache NiFi

Introduction Apache NiFi is a powerful tool for data migration. It provides an easy to use interface to connect to a ...

Oracle

Bushy join trees in Oracle 12.2

Context There are multiple optimizer features introduced in the Oracle Database 12.2 Release. Bushy Join Trees is the ...

Oracle

How to fix an AWR Warehouse after credentials change

We had an AWR Warehouse (AWRW) installation (OEM 12.1.0.5 on Linux) collecting data from +50 databases for a few ...

Oracle

The importance of Oracle database related kernel parameters (aio-max-nr) (with bonus track)

We tend to configure a server following Oracle best practices for the kernel parameters, but what once was a server of ...

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Automating Oracle RMAN backup configuration on Linux with Ansible

Understanding MySQL isolation levels: repeatable-read

How to patch an exadata (part 2) - cells, IB and DB servers

MySQL crashes on DDL statement: a lesson on purge threads

Orphaned disks in OVM and what to do with them

Oracle E-Business Suite and Java Web Start. Finally!

How to patch an exadata (part 5) - troubleshooting

Oracle GoldenGate microservices architecture - first try.

Sending email from Oracle with utl_smtp via Amazon Simple Email Service (SES)

How to patch an exadata (part 1) - introduction and prerequisites

Oracle database upgrade on RDS AWS and SPM baselines

Oracle 12.2 ASM filter driver installation

Updating Elasticsearch indexes with Spark

Multi Tb migration using mydumper

Oracle Scheduler fail to send email notifications

Oracle service secrets: more performance with less load-balancing

Upgrade existing TDE to use new unified key management in 12c Upgraded Database (non-cdb)

Simple steps to perform opatch maintenance with Ansible

Standardizing the Oracle GoldenGate Home Path (OGG_HOME)

Change of database passwords through OEM

Automating password rotation for Oracle databases

Locating most current record using ROW_NUMBER() vs. Index Full Scan (Min/Max)

Automation, PowerShell and Word Templates - let the technician do tech

Cloning Oracle grid infrastructure using Ansible

How to analyze SQL server stack dumps

Dbatools and a SQL Agent

Database migration using Apache NiFi

Bushy join trees in Oracle 12.2

How to fix an AWR Warehouse after credentials change

The importance of Oracle database related kernel parameters (aio-max-nr) (with bonus track)

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