Blog | Pythian (32)

MySQL

Best practice for setting up MySQL replication filters

It is not uncommon that we need to filter out some DBs or Tables while setting up replication. It is important to ...

MySQL

Reserved words usage in MySQL

It is not uncommon to come across MySQL databases where reserved words are in use as identifiers for any kind of ...

MySQL

Why is the slave IO thread in connecting status?

MySQL

MySQL InnoDB’s full text search overview

NOTE: If you want to read and play with the interactive application, it has been developed using Shiny/R in order to ...

Infra Ops

Your Xtrabackup cheat sheet

My goal in this post is to present you with examples of useful operations using xtrabackup, using options which in some ...

Oracle

SharePlex replication between two instances on the same host

Several days ago I was asked a question about SharePlex and should verify behaviour before providing the answer. I had ...

Oracle

More fun with oracle timestamp math

Timestamp Math Several years ago I wrote an article on Oracle date math. Amazingly, that article was still available ...

MongoDB

Things to consider when deciding on a primary key for your INNODB table

When it comes to schema design, one of the more common issues I see for INNODB tables is in the selection of a primary ...

Database

Redshift table maintenance: vacuuming

Overview of managed service maintenance Part of the appeal of AWS' Redshift is that it's a managed service, which means ...

MySQL

Properly removing users in MySQL

Context Removing users in MySQL is an easy task, but there are some drawbacks to check carefully before dropping a ...

MySQL

MySQL Query best practices

You can get many returns from a Google search for "MySQL Query Best Practices" or "MySQL Query Optimization." The ...

Oracle

Oracle Live SQL: explain plan

We've all encountered a situation where you want to check a simple query or syntax for your SQL and don't have a ...

Microsoft SQL Server

Learn how to optimize text searches in SQL Server 2014 by using Full-Text Search - part 1

In this article, we'll cover the functionality available in SQL Server 2014 for textual research known as Full-Text ...

Cassandra

An effective approach to migrate dynamic thrift data to CQL, part 1

1. Introduction Recently Pythian's Cassandra team worked on one customer's request to copy data of several Cassandra ...

Oracle

Analyze index validate structure - the dark side

Recently, a co-worker encountered a significant performance hurdle after a database upgrade. The plan included ...

Microsoft Azure

Migrate a SQL Server environment with complex replication without reinitializing or rebuilding replication

Introduction When you have a SQL Server environment where a very complex replication setup is in place, and you need to ...

Oracle

Improve parsing and query performance - fix Oracle's fixed object statistics

What do I mean by 'fix' the the fixed object statistics? Simply gather statistics to help the optimizer. What are ...

DevOps

Encrypting sensitive data in puppet using hiera-eyaml

Puppet manifests can hold a lot of sensitive information. Sensitive information like passwords or certificates are used ...

MySQL

Internals of querying the concurrent requests' queue - revisited for R12.2

Once upon a time I wrote about the Internal Workflow of an E-Business Suite Concurrent Manager Process. Many things ...

MySQL

Data encryption at rest in Oracle MySQL 5.7

MySQL

InnoDB flushing and Linux I/O

Since documentation is not very clear to me on the topic of InnoDB flushing in combination with Linux IO (specifically ...

Oracle

ASM disk group just will not mount

I recently had an issue involving a damaged ASM disk group. Each time an attempt was made to mount the disk group it ...

Oracle

Enabling large pages on Oracle Database 11g running on IBM AIX

For implementing Large Pages on AIX first you will need to choose large page size at OS level. On AIX you can have ...

Oracle

GoldenGate 12.2 big data adapters: part 3 - Kafka

This article continues our deep dive into the GoldenGate Big Data adapters, specifically focusing on the Kafka adapter. ...

MySQL

How to deal with MetaData Lock

What is MetaData Lock? MySQL uses metadata locking to manage concurrent access to database objects, and to ensure data ...

Cassandra

More effective anti-entropy repair in Cassandra

1. Introduction Cassandra offers three different repair mechanisms to make sure data from different replicas are ...

Oracle

GoldenGate 12.2 big data adapters: part 4 - HBASE

This is the next post in my series about Oracle GoldenGate Big Data adapters.

MySQL

In depth: MySQL 5.6+ DDL

Overview DDL (Data Definition Language) statements create, alter, and remove database objects. These types of changes ...

Analytics

Data is everything, and everything is data

Exploring the phenomenon of “datafication” In the year 2000, only a quarter of the world’s stored information was ...

Infra Ops

How to recover space from already deleted files

Wait, what? Deleted files are gone, right? Well, not so if they’re currently in use, with an open file handle by an ...

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Best practice for setting up MySQL replication filters

Reserved words usage in MySQL

Why is the slave IO thread in connecting status?

MySQL InnoDB’s full text search overview

Your Xtrabackup cheat sheet

SharePlex replication between two instances on the same host

More fun with oracle timestamp math

Things to consider when deciding on a primary key for your INNODB table

Redshift table maintenance: vacuuming

Properly removing users in MySQL

MySQL Query best practices

Oracle Live SQL: explain plan

Learn how to optimize text searches in SQL Server 2014 by using Full-Text Search - part 1

An effective approach to migrate dynamic thrift data to CQL, part 1

Analyze index validate structure - the dark side

Migrate a SQL Server environment with complex replication without reinitializing or rebuilding replication

Improve parsing and query performance - fix Oracle's fixed object statistics

Encrypting sensitive data in puppet using hiera-eyaml

Internals of querying the concurrent requests' queue - revisited for R12.2

Data encryption at rest in Oracle MySQL 5.7

InnoDB flushing and Linux I/O

ASM disk group just will not mount

Enabling large pages on Oracle Database 11g running on IBM AIX

GoldenGate 12.2 big data adapters: part 3 - Kafka

How to deal with MetaData Lock

More effective anti-entropy repair in Cassandra

GoldenGate 12.2 big data adapters: part 4 - HBASE

In depth: MySQL 5.6+ DDL

Data is everything, and everything is data

How to recover space from already deleted files

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