Blog | Pythian (45)

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 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 ...

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

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

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

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 ...

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

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

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

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

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

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

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 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

3 Tips on Using dg4odbc on 64-bit Linux

MERGE Without an INSERT -- It's Not Always Like an UPDATE

How to Make an In-Database listener.log File

Bind Peeking, Ad Hoc Queries, Stable Performance

How to Rename a Copied or Cloned ASM Disk Group

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

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

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?

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

Changing Hostnames in Oracle RAC

How to Recover Deleted Oracle Datafiles with No Downtime

Recent Spike Report from v$active_session_history (ASH)

Oracle Standby Recovery Rate Monitoring

Total Recall by DUDE: Extracting Oracle Data After RAID Corruption

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