Blog | Pythian (30)

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 ...

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

Replicating users and tablespaces with Oracle GoldenGate

I decided to write this blog post after reading some comments on my older posts and several online discussions where ...

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

Parting with ocm.rsp isn't really sweet sorrow...

Context Now that we're well into 2017, let's sit back and ask the question: "What was the best news of 2016 in the ...

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

How to patch an exadata (part 6) - timing

Quick links to Part 1 / Part 2 / Part 3 / Part 4 / Part 5 / Part 6 6: Timing Now that we know how to patch every ...

Oracle

How to patch an exadata (part 4) - the rollback procedure

Quick links to Part 1 / Part 2 / Part 3 / Part 4 / Part 5 / Part 6 4: The Rollback Procedure You will most likely never ...

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, ...

Using transportable tablespaces with partitioned tables

Overview In this post I will explain how to transfer a partitioned table using transportable tablespaces on MySQL 5.6. ...

Oracle

ORA-30926 while using impdp over a database link

The other day I was doing an import using impdp in 12.1.0.2, and received ...

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Background The other day I was doing an import using impdp in 12.1.0.2, and received the following error:'ORA-30926: ...

Microsoft SQL Server

SQL Server default configurations that you should change

Who here takes the time to adjust default values for SQL Server Configuration after installing it? Unless your company ...

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

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

How to patch an exadata (part 3) - grid and database OH patching

Quick links to Part 1 / Part 2 / Part 3 / Part 4 / Part 5 / Part 6 3.4 Patching the Grid Infrastructure 3.4.0 - ...

Oracle

Reading execution plans for parallel DML

Introduction: Parallel execution in Oracle seems to be a topic of myths, mysteries and misunderstandings. In this post ...

Cloud

Ansible and AWS automation

Overview The goal was to create and manage a MySQL RDS instance and learn how to control AWS resources by using ...

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

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

Backup Oracle databases to AWS S3

There are different options for backing up Oracle databases to Cloud, but using Oracle Secure Backup module to take ...

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 ...

Oracle

Customizing pt-stalk to capture the diagnostics data you really need

Valeriy Kravchuk's great recent post on using oprofile to profile MySQL mentioned how pt-stalk, the script from Percona ...

Microsoft SQL Server

DBAs: The 5 key skills you will need in the cloud

Like many organizations, yours is likely under pressure to reduce costs and resources, while increasing storage ...

MySQL

Duplicate indexes in MySQL

Why do we sometimes want to keep duplicate indexes? I’ve done dutiful DBA work in the past to identify and remove what ...

MySQL

Asynchronous replication from MySQL cluster

MySQL Cluster is a highly available, distributed, shared-nothing database with very interesting performance ...

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 ...

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Understanding MySQL isolation levels: repeatable-read

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

Orphaned disks in OVM and what to do with them

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

Replicating users and tablespaces with Oracle GoldenGate

How to patch an exadata (part 5) - troubleshooting

Parting with ocm.rsp isn't really sweet sorrow...

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

How to patch an exadata (part 6) - timing

How to patch an exadata (part 4) - the rollback procedure

Multi Tb migration using mydumper

Using transportable tablespaces with partitioned tables

ORA-30926 while using impdp over a database link

SQL Server default configurations that you should change

Oracle Scheduler fail to send email notifications

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

Simple steps to perform opatch maintenance with Ansible

How to patch an exadata (part 3) - grid and database OH patching

Reading execution plans for parallel DML

Ansible and AWS automation

Change of database passwords through OEM

Automating password rotation for Oracle databases

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

Backup Oracle databases to AWS S3

Cloning Oracle grid infrastructure using Ansible

Customizing pt-stalk to capture the diagnostics data you really need

DBAs: The 5 key skills you will need in the cloud

Duplicate indexes in MySQL

Asynchronous replication from MySQL cluster

Bushy join trees in Oracle 12.2

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