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

Pythian goodies: the answer to free memory, swap, oracle, and everything

I gave this talk at the UKOUG, and I have received a few requests to post the slides online. Instead of just posting ...

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

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

How To Set Up Oracle ASM on Ubuntu Gutsy Gibbon

I’ve recently moved to Ubuntu Linux, and this post describes my attempt to play around with Oracle ASM on Ubuntu. For ...

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

Using DBMS_SYS_SQL to Execute Statements as Another User

I do realize that for most of you, there may be nothing new about the dbms_sys_sql package knowledge of it has been ...

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 ...

Oracle

Oracle: Is OUTER JOIN Better Than NOT EXISTS?

I’ve been told that using NOT EXISTS in (Oracle) SQL is a bad idea, and that a way to overcome this problem is to ...

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

How To Recreate the Oracle Clusterware Voting Disk

Recreating the Voting disk may not be as easy as written in Metalink. If you work with RAC, you know about Metalink ...

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 ...

Oracle

Oracle Grid Control: The Importance of Deleting the emkey

Disclaimer: In most countries, looking at user passwords is illegal. Never try what is written below on a system that ...

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 ...

Oracle

How to Recover Deleted Oracle Datafiles with No Downtime

So you have accidentally removed a datafile from your production database? First thing, DON’T PANIC! There’s an easy ...

Oracle

Oracle Standby Recovery Rate Monitoring

So you have created your standby database using the RMAN DUPLICATE command, you have set the ARCHIVE_LAG_TARGET to ...

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?

Pythian goodies: the answer to free memory, swap, oracle, and everything

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

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

How To Set Up Oracle ASM on Ubuntu Gutsy Gibbon

No data found -> success in dbms_scheduler

MySQL Memory Usage Profile Script

Oracle: Standby Automatic File Management

Using DBMS_SYS_SQL to Execute Statements as Another User

Oracle Outside In Technology 8.2.0

REMOTE_LOGIN_PASSWORDFILE = EXCLUSIVE in Oracle 10g

Oracle: Is OUTER JOIN Better Than NOT EXISTS?

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

RMAN Recipes: How to Switch Oracle Logs Automatically

How To Recreate the Oracle Clusterware Voting Disk

Block Change Tracking Internals: X$ Tables Research

Oracle Grid Control: The Importance of Deleting the emkey

Reporting Space-Wasting Objects in Oracle

Changing Hostnames in Oracle RAC

How to Recover Deleted Oracle Datafiles with No Downtime

Oracle Standby Recovery Rate Monitoring

Total Recall by DUDE: Extracting Oracle Data After RAID Corruption

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