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

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 ...

MySQL

SQL Injection with MySQL SLEEP()

Recently we've received an alert from one of our clients that running threads are high on one of their servers. Once we ...

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 ...

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 ...

Google Cloud

How to run OpenTSDB with Google Bigtable

In a previous post ( OpenTSDB and Google Cloud Bigtable) we discussed OpenTSDB, an open source distributed database ...

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 ...

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 ...

Oracle

GoldenGate 12.2 big data adapters: part 1 - HDFS

December 2015 brought us a new version of GoldenGate, and a new version for Big Data adapters for the GoldenGate. Let's ...

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

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.

Oracle

Changes to DBCA patch application behaviour causes PDB cloning to fail

Background A test upgrade from 11g to 12c and conversion to a container and pluggable database recently pointed out ...

Oracle

GoldenGate 12.2 big data adapters: part 2 - FLUME

In this blog post, we continue our review of the new Oracle GoldenGate Big Data adapters. In the first part of the ...

MySQL

In depth: MySQL 5.6+ DDL

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

MySQL

Connection timeout parameters in MySQL

Introduction wait_timeout interactive_timeout net_read_timeout net_write_timeout What do these timeouts do in MySQL? If ...

Infra Ops

Centralized authentication with Red Hat directory server for Linux systems

User management on Linux systems can be tedious, and when you add in more than 10 systems the chances are it is going ...

Microsoft SQL Server

Amazon database migration service - first try

Recently, checking Amazon Web Services, I stumbled upon a service I hadn't tested before. It was Data Migration Service ...

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

MySQL InnoDB’s full text search overview

SQL Injection with MySQL SLEEP()

More fun with oracle timestamp math

Redshift table maintenance: vacuuming

Properly removing users in MySQL

MySQL Query best practices

How to run OpenTSDB with Google Bigtable

Oracle Live SQL: explain plan

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

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

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

GoldenGate 12.2 big data adapters: part 1 - HDFS

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

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

Changes to DBCA patch application behaviour causes PDB cloning to fail

GoldenGate 12.2 big data adapters: part 2 - FLUME

In depth: MySQL 5.6+ DDL

Connection timeout parameters in MySQL

Centralized authentication with Red Hat directory server for Linux systems

Amazon database migration service - first try

Data is everything, and everything is data

How to recover space from already deleted files

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