Blog | Pythian (44)

Oracle

Stabilize Oracle 10G's Bind Peeking Behaviour

I wrote this post because I feel there is a great need for it. The number of people struggling with unstable query ...

Oracle

What's New in 11i TXK AutoConfig and Templates Rollup Patch S

Context You might have already seen the blog update on Steven Chan's site. TXK AutoConfig and Templates Rollup Patch S ...

Oracle

Oracle 11g -- Audit Enabled by Default, But What About Purging?

Introduction If you have created a new Oracle 11g database using DBCA and opted to use by default 11g's enhanced ...

Oracle

Undocumented parameter _fix_control: How to break your database

Introduction Beware this parameter can prevent your database from starting. Indeed it can prevent your instance from ...

Oracle

Tuning 'log file sync' Event Waits

In this blog entry, I will discuss strategies and techniques to resolve 'log file sync' waits. This entry is intended ...

Oracle

3 Tips on Using dg4odbc on 64-bit Linux

I recently imported the contents of an Oracle 8i database into an 11g database. Since the original application needed ...

Oracle

How to Make an In-Database listener.log File

Introduction Ever wished the listener.log file was a table in the database? Wish no more! About three years ago, I sent ...

Oracle

Oracle RAC and gv$ Views: A Second Look

Context I decided to reprise my commentary on Oracle RAC and the gv$ views after reading Patrick’s comments on my ...

MySQL

MySQL Back to Basics: Analyze, Check, Optimize, and Repair

It felt like the right time for us to look back at some useful commands for table maintenance that some of us may not ...

Oracle

Bind Peeking, Ad Hoc Queries, Stable Performance

I got to troubleshoot an amazing situation a few weeks ago. I think, we can all agree that assuming we are on a ...

Oracle Silent Mode, Part 6: Removing a Node From a 10.2 RAC

This sixth post describes how to remove a node from a 10.2 RAC cluster in silent mode. It differs from the associated ...

Oracle

How to Rename a Copied or Cloned ASM Disk Group

ASM is definitely one of the coolest technologies inside the Oracle Database. On the other hand, the ability of the ...

Oracle

ORA-01450 During Online Index Rebuild

Background We hit an ORA-01450 error today trying to do online rebuild for an index in an unusable state. This was a ...

MySQL

Using mysqld_multi to Manage Multiple Servers

I recently needed to set up multiple MySQL servers on a test computer to simulate a master-slave setup. I had never ...

Oracle

Oracle RAC, v$, and gv$

According to wikipedia, “The rack is a medieval torture . . . which induces excruciating pain as the victim’s joints ...

DevOps

Emacs Keybindings in Bash

How to Be a Command-Line Commando Does it surprise you to learn that I’m a Linux guy? I’ve been using Linux, to the ...

Oracle

Oracle ASM 11g: Does the ASMCMD cp Command Really Work?

Update 21-Sep-2011: It’s definitely was a bug in an early 11g release. As cp command does work in the latest release. ...

Microsoft SQL Server

Distribution Cleanup job and xp_cmdshell

Troubleshooting SQL Server replication is often like being a digital detective—you see a cryptic error at the surface, ...

Oracle

Oracle Application Server: How to Bounce AS from One Location

In this post and some upcoming posts, I’m going to write more about Oracle application servers, a subject we have ...

Oracle

Resolving High Water Enqueue Contention

Recently, I had a few email exchanges — on the Oracle-l list and offline — about HW enqueue contention. A few ...

Oracle

Oracle Silent Mode, Part 1: Installation Of 10.2 And 11.1 Databases

This post is the first of a series of ten posts that will explore some of the Oracle Universal Installer (OUI), Network ...

Oracle

Multi-Column Correlation and Extended Stats in Oracle 11g

Introduction We all have encountered this situation many times before: the cost-based optimizer assumes no correlation ...

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

Identifying SQL Execution Bottlenecks Scientifically

Background A few days ago, a developer and I had an interesting conversation. The developer was trying to tune an ...

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

Oracle 11g ASM Diskgroup Compatibility

Back in April I was at COLLABORATE 08 and delivered a presentation on 11g — Oracle 11g New Features Out of the Box, ...

Oracle

Tuning Latch Contention: Cache-buffers-chain latches

Recently, I had an opportunity to tune latch contention for cache buffers chain (CBC) latches. The problem was high ...

Oracle

Recent Spike Report from v$active_session_history (ASH)

Background For the past few months I’ve been using a query that I refer to as “ash report – recent spike”. That’s the ...

Oracle

FLASHBACK TABLE vs. DBA_OBJECTS . LAST_DDL_TIME

A little over a week ago, a teammate and I were trying to use Oracle’s FLASHBACK TABLE to undo an “oops” UPDATE ...

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Stabilize Oracle 10G's Bind Peeking Behaviour

What's New in 11i TXK AutoConfig and Templates Rollup Patch S

Oracle 11g -- Audit Enabled by Default, But What About Purging?

Undocumented parameter _fix_control: How to break your database

Tuning 'log file sync' Event Waits

3 Tips on Using dg4odbc on 64-bit Linux

How to Make an In-Database listener.log File

Oracle RAC and gv$ Views: A Second Look

MySQL Back to Basics: Analyze, Check, Optimize, and Repair

Bind Peeking, Ad Hoc Queries, Stable Performance

Oracle Silent Mode, Part 6: Removing a Node From a 10.2 RAC

How to Rename a Copied or Cloned ASM Disk Group

ORA-01450 During Online Index Rebuild

Using mysqld_multi to Manage Multiple Servers

Oracle RAC, v$, and gv$

Emacs Keybindings in Bash

Oracle ASM 11g: Does the ASMCMD cp Command Really Work?

Distribution Cleanup job and xp_cmdshell

Oracle Application Server: How to Bounce AS from One Location

Resolving High Water Enqueue Contention

Oracle Silent Mode, Part 1: Installation Of 10.2 And 11.1 Databases

Multi-Column Correlation and Extended Stats in Oracle 11g

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

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

Identifying SQL Execution Bottlenecks Scientifically

Consistent Gets not the Best Way to Look at Query Performance

Oracle 11g ASM Diskgroup Compatibility

Tuning Latch Contention: Cache-buffers-chain latches

Recent Spike Report from v$active_session_history (ASH)

FLASHBACK TABLE vs. DBA_OBJECTS . LAST_DDL_TIME

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