Blog | Pythian | Database (32)

Oracle

Stabilize Oracle 10G's Bind Peeking Behaviour

I wrote this post because I feel there is a great need for it. The number of people struggling with unstable query ...

Oracle

What's New in 11i TXK AutoConfig and Templates Rollup Patch S

Context You might have already seen the blog update on Steven Chan's site. TXK AutoConfig and Templates Rollup Patch S ...

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

Undocumented parameter _fix_control: How to break your database

Introduction Beware this parameter can prevent your database from starting. Indeed it can prevent your instance from ...

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

3 Tips on Using dg4odbc on 64-bit Linux

I recently imported the contents of an Oracle 8i database into an 11g database. Since the original application needed ...

Oracle

How to Make an In-Database listener.log File

Introduction Ever wished the listener.log file was a table in the database? Wish no more! About three years ago, I sent ...

Oracle

Oracle RAC and gv$ Views: A Second Look

Context I decided to reprise my commentary on Oracle RAC and the gv$ views after reading Patrick’s comments on my ...

Oracle

Bind Peeking, Ad Hoc Queries, Stable Performance

I got to troubleshoot an amazing situation a few weeks ago. I think, we can all agree that assuming we are on a ...

Oracle

How to Rename a Copied or Cloned ASM Disk Group

ASM is definitely one of the coolest technologies inside the Oracle Database. On the other hand, the ability of the ...

Oracle

Oracle Standby redo Logs

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

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

Oracle RAC, v$, and gv$

According to wikipedia, “The rack is a medieval torture . . . which induces excruciating pain as the victim’s joints ...

Oracle

Oracle ASM 11g: Does the ASMCMD cp Command Really Work?

Update 21-Sep-2011: It’s definitely was a bug in an early 11g release. As cp command does work in the latest release. ...

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 ...

Microsoft SQL Server

Distribution Cleanup job and xp_cmdshell

Troubleshooting SQL Server replication is often like being a digital detective—you see a cryptic error at the surface, ...

Oracle

Oracle Application Server: How to Bounce AS from One Location

In this post and some upcoming posts, I’m going to write more about Oracle application servers, a subject we have ...

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

Resolving High Water Enqueue Contention

Recently, I had a few email exchanges — on the Oracle-l list and offline — about HW enqueue contention. A few ...

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

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

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 ...

Oracle

Multi-Column Correlation and Extended Stats in Oracle 11g

Introduction We all have encountered this situation many times before: the cost-based optimizer assumes no correlation ...

Oracle

Identifying SQL Execution Bottlenecks Scientifically

Background A few days ago, a developer and I had an interesting conversation. The developer was trying to tune an ...

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

Recent Spike Report from v$active_session_history (ASH)

Background For the past few months I’ve been using a query that I refer to as “ash report – recent spike”. That’s the ...

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

FLASHBACK TABLE vs. DBA_OBJECTS . LAST_DDL_TIME

A little over a week ago, a teammate and I were trying to use Oracle’s FLASHBACK TABLE to undo an “oops” UPDATE ...

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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Stabilize Oracle 10G's Bind Peeking Behaviour

What's New in 11i TXK AutoConfig and Templates Rollup Patch S

Oracle 11g's SQL Performance Analyzer

Undocumented parameter _fix_control: How to break your database

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

3 Tips on Using dg4odbc on 64-bit Linux

How to Make an In-Database listener.log File

Oracle RAC and gv$ Views: A Second Look

Bind Peeking, Ad Hoc Queries, Stable Performance

How to Rename a Copied or Cloned ASM Disk Group

Oracle Standby redo Logs

Oracle file extent map, the old-fashioned way

Oracle RAC, v$, and gv$

Oracle ASM 11g: Does the ASMCMD cp Command Really Work?

How To Set Up Oracle ASM on Ubuntu Gutsy Gibbon

Distribution Cleanup job and xp_cmdshell

Oracle Application Server: How to Bounce AS from One Location

Using DBMS_SYS_SQL to Execute Statements as Another User

Oracle Outside In Technology 8.2.0

Resolving High Water Enqueue Contention

Oracle: Is OUTER JOIN Better Than NOT EXISTS?

How To Recreate the Oracle Clusterware Voting Disk

Oracle Grid Control: The Importance of Deleting the emkey

Multi-Column Correlation and Extended Stats in Oracle 11g

Identifying SQL Execution Bottlenecks Scientifically

How to Recover Deleted Oracle Datafiles with No Downtime

Recent Spike Report from v$active_session_history (ASH)

Oracle Standby Recovery Rate Monitoring

FLASHBACK TABLE vs. DBA_OBJECTS . LAST_DDL_TIME

Total Recall by DUDE: Extracting Oracle Data After RAID Corruption

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