Blog | Pythian | Database (31)

Microsoft SQL Server

SQL Server COMPILE Locking and Encryption Keys

Introduction The morning begins with this page: "a large number of sessions are blocked on one of your managed SQL ...

Oracle

Oracle Silent Mode, Part 9: Remove a Node from an 11.1 RAC database

This 9 th post will describe how to remove a node from a 11.1 RAC cluster in silent mode. It will differ from the ...

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

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

Does Oracle's Block Change Tracking File Shrink?

Intro Just a quick post to get myself back into blogging mode. Recently in IRC ( #oracle on freenode, to be precise), a ...

MySQL

Audit a MySQL Instance with MySQLTuner

Quite often we need to perform a so-called "MySQL instance audit". This common DBA procedure should give you a general ...

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

How To Choose Your Oracle Database ID (DBID)

You can choose a DBID when you rename your Oracle database. This is probably a bad, unsupported, and useless idea. I ...

MySQL

MySQL: Replacing URL Escape Sequences

Requirement So you want to store URLs in MySQL, and the URLs have those annoying %20%27%7C%26%5E%2B%2D%25 symbols? And ...

Oracle

Testing a Physical Standby Database in Oracle 10g

If you don’t want to deal with missteps, I recommend that you test your standby database to facilitate the failover or ...

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 ...

Oracle

JSP Cache Issues in 11i and R12

As an Apps DBA, you might have been asked to clear the JSP cache many times, either by Developers or Oracle Support. ...

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 Silent Mode, Part 8: Add a Node to a 11.1 RAC Database

The process of adding a node to a 11.1 RAC is very similar to the 10.2 process described in Part 5 of this series. For ...

MySQL

MySQL Memory Consumption

Identifying the Gaps in MySQL Memory Monitoring Had an interesting situation come up today with a client. We had a ...

Oracle

How to Find Objects Creating nologging Changes

In an Oracle-l thread, this question was raised: how can you find objects creating nologging changes? First, what is a ...

Oracle

Performance Tuning: HugePages in Linux

Recently we quickly and efficiently resolved a major performance issue with one of our New York clients. In this blog, ...

Oracle

Standby Log Apply Elapsed Time

This has been discussed before by my colleague Paul Moen in his article on Oracle standby recovery rate monitoring, but ...

Oracle

How to Tie OS-level PIDs to Oracle Database Sessions

About once a week, our team gets a request from the server admins to provide some information on why a database server ...

Microsoft SQL Server

SQL Server: Understanding and Controlling Connection

I got the idea for this article when one of our clients complained that their server’s performance was degrading during ...

Oracle

Oracle Performance Issue: High Kernel-Mode CPU Usage

Recently, I resolved a performance issue with one of our esteemed clients. I found the problem interesting and worth ...

MySQL

How To Access MySQL from Oracle With ODBC and SQL

The Oracle gateway for ODBC provides an almost seamless data integration between Oracle and other RDBMS. I won’t argue ...

Oracle

How to become an Oracle Certified Master (OCM)

A turning point in a DBA’s career is when he/she is recognized by Oracle as an elite Oracle professional. I was happily ...

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 ...

Microsoft SQL Server

T-SQL Script: Return Replication Info, Plus Undistributed Commands

In SQL Server Replication, a regular check is getting the number of undistributed commands for a transactional ...

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

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 ...

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SQL Server COMPILE Locking and Encryption Keys

Oracle Silent Mode, Part 9: Remove a Node from an 11.1 RAC database

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

Tuning 'log file sync' Event Waits

Does Oracle's Block Change Tracking File Shrink?

Audit a MySQL Instance with MySQLTuner

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

How To Choose Your Oracle Database ID (DBID)

MySQL: Replacing URL Escape Sequences

Testing a Physical Standby Database in Oracle 10g

ORA-01450 During Online Index Rebuild

JSP Cache Issues in 11i and R12

Using mysqld_multi to Manage Multiple Servers

Oracle Silent Mode, Part 8: Add a Node to a 11.1 RAC Database

MySQL Memory Consumption

How to Find Objects Creating nologging Changes

Performance Tuning: HugePages in Linux

Standby Log Apply Elapsed Time

How to Tie OS-level PIDs to Oracle Database Sessions

SQL Server: Understanding and Controlling Connection

Oracle Performance Issue: High Kernel-Mode CPU Usage

How To Access MySQL from Oracle With ODBC and SQL

How to become an Oracle Certified Master (OCM)

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

T-SQL Script: Return Replication Info, Plus Undistributed Commands

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

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

Consistent Gets not the Best Way to Look at Query Performance

Oracle 11g ASM Diskgroup Compatibility

Tuning Latch Contention: Cache-buffers-chain latches

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