Blog | Pythian (43)

Microsoft SQL Server

SQL Server COMPILE Locking and Encryption Keys

Introduction The morning begins with this page: "a large number of sessions are blocked on one of your managed SQL ...

Oracle

Oracle Silent Mode, Part 9: Remove a Node from an 11.1 RAC database

This 9 th post will describe how to remove a node from a 11.1 RAC cluster in silent mode. It will differ from the ...

Oracle

Quick Install Guide for Oracle 10g Release 2 on Mac OS X Leopard & Snow Leopard

I was very surprised that Oracle released Oracle Database for Mac OSX, especially, version 10g now that 11g has been ...

Oracle

Does Oracle's Block Change Tracking File Shrink?

Intro Just a quick post to get myself back into blogging mode. Recently in IRC ( #oracle on freenode, to be precise), a ...

MySQL

Audit a MySQL Instance with MySQLTuner

Quite often we need to perform a so-called "MySQL instance audit". This common DBA procedure should give you a general ...

Oracle

How To Choose Your Oracle Database ID (DBID)

You can choose a DBID when you rename your Oracle database. This is probably a bad, unsupported, and useless idea. I ...

Oracle

Adding Columns with Default Values and Not Null in Oracle 11g

Oracle 11g has a new performance enhancement when adding columns. In the pre-11g releases, adding a new not null column ...

MySQL

MySQL: Replacing URL Escape Sequences

Requirement So you want to store URLs in MySQL, and the URLs have those annoying %20%27%7C%26%5E%2B%2D%25 symbols? And ...

Oracle

Testing a Physical Standby Database in Oracle 10g

If you don’t want to deal with missteps, I recommend that you test your standby database to facilitate the failover or ...

Oracle

JSP Cache Issues in 11i and R12

As an Apps DBA, you might have been asked to clear the JSP cache many times, either by Developers or Oracle Support. ...

Oracle

Oracle Silent Mode, Part 8: Add a Node to a 11.1 RAC Database

The process of adding a node to a 11.1 RAC is very similar to the 10.2 process described in Part 5 of this series. For ...

MySQL

MySQL Memory Consumption

Identifying the Gaps in MySQL Memory Monitoring Had an interesting situation come up today with a client. We had a ...

Oracle

How to Find Objects Creating nologging Changes

In an Oracle-l thread, this question was raised: how can you find objects creating nologging changes? First, what is a ...

Oracle

ORA-16069? You May Need A New Standby Controlfile

Backstory: On a recent Monday, I had to perform an emergency Oracle standby switchover for a client whose primary ...

Oracle

Performance Tuning: HugePages in Linux

Recently we quickly and efficiently resolved a major performance issue with one of our New York clients. In this blog, ...

Oracle

Standby Log Apply Elapsed Time

This has been discussed before by my colleague Paul Moen in his article on Oracle standby recovery rate monitoring, but ...

Oracle

How to Tie OS-level PIDs to Oracle Database Sessions

About once a week, our team gets a request from the server admins to provide some information on why a database server ...

Microsoft SQL Server

SQL Server: Understanding and Controlling Connection

I got the idea for this article when one of our clients complained that their server’s performance was degrading during ...

Oracle

Oracle Performance Issue: High Kernel-Mode CPU Usage

Recently, I resolved a performance issue with one of our esteemed clients. I found the problem interesting and worth ...

MySQL

How To Access MySQL from Oracle With ODBC and SQL

The Oracle gateway for ODBC provides an almost seamless data integration between Oracle and other RDBMS. I won’t argue ...

Oracle

How to become an Oracle Certified Master (OCM)

A turning point in a DBA’s career is when he/she is recognized by Oracle as an elite Oracle professional. I was happily ...

MySQL

What Exactly is Swappiness?

This is an issue that keeps rearing its ugly head over and over again, and since it greatly affects performance, it is ...

Oracle

Killing an Oracle Job Dead

If you ever thought it was easy to kill an Oracle job, let me show you something that gave me a headache today. We’re ...

Microsoft SQL Server

T-SQL Script: Return Replication Info, Plus Undistributed Commands

In SQL Server Replication, a regular check is getting the number of undistributed commands for a transactional ...

Oracle

Oracle: Delete and Re-Insert a Row in the Same Statement

It’s probably worth some explanation to understand where I want to drive you: when you run an update in Oracle, the ...

Database

Multi-Node to Single-Node Cloning in R12 and 11i

Introduction Anybody who has tried this multi-node to single-node cloning in 11i knows that it’s difficult and very ...

Microsoft SQL Server

How Do You Edit a dump/exp/script File?

Problem Statement If you work with databases long enough, you run into a certain problem. You have a mysqldump file* of ...

Oracle

Consistent Gets not the Best Way to Look at Query Performance

This post is for those who think Consistent Gets is the only thing that matters. It’s not. That’s why Statspack and AWR ...

Oracle

Setting up Virtual Hosts for Database and Applications Tiers in 11i

I would like to share with you the virtual hosts set-up (two nodes each on the application tier, and two on the DB ...

Oracle

Oracle E-Business Suite: Querying Patches, Part 2

In the first part of this blog I tried to shed some light on EBS patch terminology and naming conventions. In this ...

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Using Multi-Agent Reasoning for NLP-to-SQL

As data-driven decision-making becomes essential, access to that data shouldn’t require deep technical ...

Analytics

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Analytics

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SQL Server COMPILE Locking and Encryption Keys

Oracle Silent Mode, Part 9: Remove a Node from an 11.1 RAC database

Quick Install Guide for Oracle 10g Release 2 on Mac OS X Leopard & Snow Leopard

Does Oracle's Block Change Tracking File Shrink?

Audit a MySQL Instance with MySQLTuner

How To Choose Your Oracle Database ID (DBID)

Adding Columns with Default Values and Not Null in Oracle 11g

MySQL: Replacing URL Escape Sequences

Testing a Physical Standby Database in Oracle 10g

JSP Cache Issues in 11i and R12

Oracle Silent Mode, Part 8: Add a Node to a 11.1 RAC Database

MySQL Memory Consumption

How to Find Objects Creating nologging Changes

ORA-16069? You May Need A New Standby Controlfile

Performance Tuning: HugePages in Linux

Standby Log Apply Elapsed Time

How to Tie OS-level PIDs to Oracle Database Sessions

SQL Server: Understanding and Controlling Connection

Oracle Performance Issue: High Kernel-Mode CPU Usage

How To Access MySQL from Oracle With ODBC and SQL

How to become an Oracle Certified Master (OCM)

What Exactly is Swappiness?

Killing an Oracle Job Dead

T-SQL Script: Return Replication Info, Plus Undistributed Commands

Oracle: Delete and Re-Insert a Row in the Same Statement

Multi-Node to Single-Node Cloning in R12 and 11i

How Do You Edit a dump/exp/script File?

Consistent Gets not the Best Way to Look at Query Performance

Setting up Virtual Hosts for Database and Applications Tiers in 11i

Oracle E-Business Suite: Querying Patches, Part 2

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