Blog | Pythian | Database (28)

Oracle

Oracle Instance Memory Usage

How much memory does an Oracle instance actually use? How much does each individual database connection consume? ...

MySQL

Some Fun with MySQL's History List

Why this article? First of all, because I had fun digging in the code. Then, I was reading a lot about the improvements ...

MySQL

Rails and Database Session Variables

Ruby's ActiveRecord provides a very robust means of manipulating database table structures especially in the context of ...

Oracle

Secrets of Oracle's Automatic Degree of Parallelism

Background: Automatic degree of parallelism, or Auto DOP, is a new feature in 11gR2 that promises to help manage ...

Oracle

Oracle Database Appliance: Storage Performance -- Part 1

Today I want to show what kind of IO performance we can get from Oracle Database Appliance (ODA). In this part, I will ...

Microsoft SQL Server

SQL server:opening errorlog:Failed to retrieve data for this request

After an in place upgrade of SQL server 2005 to SQL server 2008 R2 , I tried to open SQL errorlog from Management> ...

Oracle

Oracle VM Manager: OVMAPI_6000E Internal Error: Connection Refused

Quick Update This is just a quick post to share my first 3.1.1 Oracle VM Manager (OVMM) troubleshooting experience. ...

Oracle

Oracle Database Appliance -- Storage expansion with NFS (dNFS, HCC)

The biggest objection to Oracle Database Appliance (ODA) we hear from customers is about 4TB usable space limit ...

MySQL

Why are your indexes larger than your actual data?

It’s a common but startling sight for any DBA: you look at your database statistics and realize your indexes are ...

Oracle

Linux Patching and Oracle: Detect RPM conflicts before they happen

A common scenario in the life of a DBA on a linux server looks something like this: From: Sue-the-sysadamin To:the-dba ...

MySQL

Exporting the mysql.slow_log table into slow query log format

Using pt-query-digest is an excellent way to perform a SQL review. However, sometimes you don't have access to the ...

MySQL

Hashing Algorithm in MySQL PASSWORD()

Investigating the MySQL PASSWORD() Hashing Algorithm Recently we had a question from a customer: what is the hashing ...

Microsoft SQL Server

T-SQL: Retrieve all users and associated roles for ALL databases

Context A frequent inquiry concerning databases’ security is to retrieve the database role(s) associated with each user ...

Oracle

Getting GoldenGate Heartbeats Working with SUPPRESSTRIGGERS

Those of you who have seen me present about GoldenGate will know that I recommend using a heartbeat table to monitor ...

Oracle

DBA_SCHEDULER_RUNNING_JOBS, where have you been?!

Backstory Where: Meeting room, Pythian office, Sydney, Australia. When: Afternoon, after lunch time. What: Discussion ...

Oracle

Unofficial Oracle Database Appliance FAQ

Introduction I’ve started putting together some information about the Oracle Database Appliance in question-and-answer ...

Microsoft SQL Server

Troubleshooting SSPI handshake error

I have seen lots of questions floating in the msdn forums about SSPI Handshake error, the main question is around error ...

Oracle

Tools That Make Your Work with Oracle VM Easier

After completing your Oracle VM and Oracle VM Manager installation, you are ready to start your friendship with Oracle ...

Microsoft SQL Server

SQL server: Create missing indexes with unmessing names

If you do any performance tuning, and everyone does, then you’ll come to a point where you want to know if your tables ...

Oracle

Disabling Oracle triggers on a per-session basis

Update Jan-2014: I’ve added a note on disabling triggers in Oracle 11.2.0.4 Introduction I recently blogged about an ...

MySQL

Rounding Errors in MYSQL with DECIMAL Type

It seems to be assumed that fixed-point values, DECIMAL and NUMERIC, in MySQL are not susceptible to rounding errors ...

Oracle

My SLOB IO Testing Index

Previous References ALL Pythian blog posts with Post Tag #SLOB My First Experience Running SLOB – Status Update 1 – or ...

MySQL

Once again about innodb-concurrency-tickets

I had to refresh my knowledge on how InnoDB threads queue works the other day when debugging activity spikes on one of ...

MySQL

Change Views DEFINER Without ALTER VIEW: How to Fix Thousands of Views

Recently I faced an interesting challenge: modify over 26k views on a single mysqld instance. Altering the view one by ...

Microsoft SQL Server

T-SQL:Generate statements to add TEMPDB datafiles

TEMPDB, is one of SQL server hot-debated topics; there’s always something to say about its sizing, file placement or ...

MySQL

Debugging IN vs OR Performance in MySQL

I was recently puzzled by the question: “Which query will be faster?” SELECT * FROM table WHERE pk = x OR pk = x1 OR pk ...

Oracle

RMAN duplicate in details

Its all started from the question on communities.oracle.com An “enhancement” in 11.2 prevents RMAN duplicating non ...

Oracle

Exadata Patching Overview

Introduction Hello everyone ! For my first time posting here on the Pythian Blog, I would like to share some of my ...

Oracle

Exadata Memory Expansion Kit

It’s always interesting to dig into the spec sheets for Exadata hardware, especially when those "minor" details like ...

Oracle

Introducing the Quarterly Database Patch for Exadata

Introduction Hot on the heels of 11.2.0.3 coming out for Exadata, there’s yet another Exadata patch schedule out: the ...

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Oracle Instance Memory Usage

Some Fun with MySQL's History List

Rails and Database Session Variables

Secrets of Oracle's Automatic Degree of Parallelism

Oracle Database Appliance: Storage Performance -- Part 1

SQL server:opening errorlog:Failed to retrieve data for this request

Oracle VM Manager: OVMAPI_6000E Internal Error: Connection Refused

Oracle Database Appliance -- Storage expansion with NFS (dNFS, HCC)

Why are your indexes larger than your actual data?

Linux Patching and Oracle: Detect RPM conflicts before they happen

Exporting the mysql.slow_log table into slow query log format

Hashing Algorithm in MySQL PASSWORD()

T-SQL: Retrieve all users and associated roles for ALL databases

Getting GoldenGate Heartbeats Working with SUPPRESSTRIGGERS

DBA_SCHEDULER_RUNNING_JOBS, where have you been?!

Unofficial Oracle Database Appliance FAQ

Troubleshooting SSPI handshake error

Tools That Make Your Work with Oracle VM Easier

SQL server: Create missing indexes with unmessing names

Disabling Oracle triggers on a per-session basis

Rounding Errors in MYSQL with DECIMAL Type

My SLOB IO Testing Index

Once again about innodb-concurrency-tickets

Change Views DEFINER Without ALTER VIEW: How to Fix Thousands of Views

T-SQL:Generate statements to add TEMPDB datafiles

Debugging IN vs OR Performance in MySQL

RMAN duplicate in details

Exadata Patching Overview

Exadata Memory Expansion Kit

Introducing the Quarterly Database Patch for Exadata

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