Blog | Pythian | Database (33)

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 Data Pump Can't Import LONG Columns

If you are using Oracle Data Pump to backup tables containing LONG or LONG RAW columns, then you might be surprised ...

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 ...

Oracle

Basic I/O Monitoring on Linux

This is my fourth week at Pythian and in Canada and I'm starting to get back to my normal life cycle --- my personal ...

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

Oracle Data Pump Schema Export and Public Synonyms

Background While testing a migration today with one of our clients, I figured out that schema export using Data Pump ...

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 block corruptions, DBV vs RMAN

Over-the-Top Tales from the Trenches Motto: Bringing order to the chaos of every day DBA life. Dear Diary, Is that a ...

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

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

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

The Mysterious World of Shmmax and Shmall

Over the Top Tales from the trenches. Motto: Bringing order to the chaos of every day DBA life. Dear Diary, Today I ...

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 ...

Oracle

Failovers with Oracle Dataguard

In the last month, we have been hit with two clients’ large-scale failures. The first involved network issues; the ...

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 ...

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What Happens When You Leave an Oracle Database in Backup Mode

Oracle Data Pump Can't Import LONG Columns

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

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

Basic I/O Monitoring on Linux

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

Oracle Data Pump Schema Export and Public Synonyms

Slow rman Backups? Check This Out

Oracle RAC Cache Fusion Efficiency: A Buffer Cache Analysis

ORA-07202: sltln: invalid parameter to sltln

Oracle block corruptions, DBV vs RMAN

Database sharding and the end of RAID?

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

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?

The Mysterious World of Shmmax and Shmall

RMAN Recipes: How to Switch Oracle Logs Automatically

Speeding-Up Oracle Export/Import Migration

Block Change Tracking Internals: X$ Tables Research

Failovers with Oracle Dataguard

Changing Hostnames in Oracle RAC

MySQL: Tuning filesorts and temporary tables

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