Blog | Pythian (45)

Oracle

What Happens When You Leave an Oracle Database in Backup Mode

While I was at that fine conference in Scotland, one of our clients did some maintenance on their Windows server where ...

Oracle

Oracle 11g's SQL Performance Analyzer

A lot of things have already been said about the Real Application Testing Option -- from the price to the most ...

Oracle

Can "between" and ">= and <=" Differ in Oracle?

Introduction To between or not to between? Sometimes I wonder how "simple" things can end up being not where you would ...

Oracle

ORA-01206: File is not part of this database - wrong database id

This was posted yesterday on Oracle-L by Li Li. I feel I should blog about it to spread the word, especially since not ...

Microsoft SQL Server

DBMS_SCHEDULER and Implicit Commits

Introduction As usual, Oracle introduces new features, and we read the documentation about how they work and we start ...

Oracle

MERGE Without an INSERT -- It's Not Always Like an UPDATE

Before you proceed with reading this post, I strongly encourage you to read Tom Kyte's trilogy about write consistency, ...

Oracle

Implementing Many-to-many Relationships in Data Warehousing

Context This article will discuss how to make many-to-many relationships in data warehousing easily queried by novice ...

Oracle

Sequences in Oracle 10g RAC

Just recently I got a call from a developer. He had a table with a primary key populated by a sequence, a timestamp ...

Oracle

Slow rman Backups? Check This Out

Notice If you have found rman backups slow in Oracle 10.2.0.2, you should check out note 375386.1 on metalink. It seems ...

Oracle

Oracle RAC Cache Fusion Efficiency: A Buffer Cache Analysis

My apologies — there will be no broccoli in this post. Introduction Many people would like to know how well their ...

Oracle

ORA-07202: sltln: invalid parameter to sltln

Context I hit this issue today while creating a new 10.2.0.3 database using DBCA. Recently, I’ve started to use DBCA ...

Oracle

Oracle Standby redo Logs

So you have created your standby database using the RMAN DUPLICATE command, you have set the minimum log switch ...

MySQL

Database sharding and the end of RAID?

Notice A short post to draw your attention to this article by Kevin Burton titled “MySQL and the Death of Raid”. ...

Oracle

Oracle file extent map, the old-fashioned way

Background Have you ever wanted to know where exactly in a datafile segments are placed? Have you ever wondered just ...

Oracle

SELECT COUNT(*) FROM Tab -> No Rows Selected

In the following SQL*Plus output… SQL> select sum(tran_sum), count(*) 2 from trans; no rows selected …something is ...

Oracle

Aligning ASM Disks on Linux

Linux is a wonderful operating system. However there are a number of things that one needs to do to make sure it runs ...

Oracle

No data found -> success in dbms_scheduler

Situation One of our clients found a bug with dbms_scheduler: it logs a job as successful when a ORA-01403 is thrown. ...

MySQL

MySQL Memory Usage Profile Script

Introduction There are various tools available for gathering and monitoring mysql performance data, but it’s not always ...

Oracle

Oracle: Standby Automatic File Management

So you have followed the recipes to create a standby database, setup the database to switch logs automatically, and ...

Oracle

Oracle Outside In Technology 8.2.0

Today I found some interesting software pieces available for download from Oracle TechNet. “Oracle Outside In ...

Oracle

REMOTE_LOGIN_PASSWORDFILE = EXCLUSIVE in Oracle 10g

I’ve never really liked the idea of REMOTE_LOGIN_PASSWORDFILE=SHARED, probably just because I haven’t seen much use for ...

MySQL

MySQL Recipes: Promoting a Slave to Master or Changing Masters

Briefing Not a dear diary post today — I have a couple up my sleeve though. In the corporate world, promoting a slave ...

Oracle

RMAN reports, or What Is the ETA of My Backup?

Introduction Over-the-Top Tales from the Trenches. Motto: Bringing order to the chaos of every day DBA life. Dear ...

Oracle

RMAN Recipes: How to Switch Oracle Logs Automatically

So you have swallowed the standby bait. You have used RMAN duplicate to create a sparkling new standby and things are ...

Oracle

Speeding-Up Oracle Export/Import Migration

Or, How To Become an Export/Import Migration Superstar! We’ve already established that I like broccoli. I get the taste ...

Oracle

Block Change Tracking Internals: X$ Tables Research

Introduction With this post, I’m starting a series about Oracle Block Change Tracking internals. The feature was ...

Reporting Space-Wasting Objects in Oracle

Woohoo, I finally got a bit of spare time to blog — my first blog post ever! Context I chose to talk about a technique ...

Oracle

Changing Hostnames in Oracle RAC

Update: this procedure is for Linux and should work on any UNIX OS. Ron supplied how he did this on Windows in the ...

MySQL

MySQL: Tuning filesorts and temporary tables

Goal: Getting rid of filesorts and temporary tables by tuning MySQL queries. Background: Filesorts and temp tables are ...

Oracle

Total Recall by DUDE: Extracting Oracle Data After RAID Corruption

Last Friday, a customer paged me to say that they could not open an Oracle 8.0.5 database after the RAID array crashed. ...

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What Happens When You Leave an Oracle Database in Backup Mode

Oracle 11g's SQL Performance Analyzer

Can "between" and ">= and <=" Differ in Oracle?

ORA-01206: File is not part of this database - wrong database id

DBMS_SCHEDULER and Implicit Commits

MERGE Without an INSERT -- It's Not Always Like an UPDATE

Implementing Many-to-many Relationships in Data Warehousing

Sequences in Oracle 10g RAC

Slow rman Backups? Check This Out

Oracle RAC Cache Fusion Efficiency: A Buffer Cache Analysis

ORA-07202: sltln: invalid parameter to sltln

Oracle Standby redo Logs

Database sharding and the end of RAID?

Oracle file extent map, the old-fashioned way

SELECT COUNT(*) FROM Tab -> No Rows Selected

Aligning ASM Disks on Linux

No data found -> success in dbms_scheduler

MySQL Memory Usage Profile Script

Oracle: Standby Automatic File Management

Oracle Outside In Technology 8.2.0

REMOTE_LOGIN_PASSWORDFILE = EXCLUSIVE in Oracle 10g

MySQL Recipes: Promoting a Slave to Master or Changing Masters

RMAN reports, or What Is the ETA of My Backup?

RMAN Recipes: How to Switch Oracle Logs Automatically

Speeding-Up Oracle Export/Import Migration

Block Change Tracking Internals: X$ Tables Research

Reporting Space-Wasting Objects in Oracle

Changing Hostnames in Oracle RAC

MySQL: Tuning filesorts and temporary tables

Total Recall by DUDE: Extracting Oracle Data After RAID Corruption

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