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How do I know if I need Oracle ACO / ASO / RAC / RAT ?

   The Database Technology market is full of various products, even when we look at just Oracle's line of products - Advanced Security, Advanced Compression, Real Application Clusters (RAC), Real Application Testing (RAT), Exadata & so on ! However, we don't just go out and buy anything - we have to have a need to have certain helper software / features to make our lives easier. How do we assess whether I need one or another ? Here's my humble attempt today to make a checklist for these 4 products (To print-out or view the sheets fully, use the direct links) ... Exadata coming soon :-) :

(1) Assessing the need for Oracle Real Application Clusters (RAC) :


RAC checklist


(2) Assessing the need for Oracle Advanced Security Option (ASO) :


ASO checklist sheet1
ASO checklist sheet2


(3) Assessing the need for Oracle Advanced Compression Option (ACO)


ACO checklist


(4) Assessing the need for Oracle Real Application Testing (RAT)


RAT checklist sheet1
RAT checklist sheet2

   If you have any suggestions on improvement, please let me know. Ia appreciate your time spent here - I hope you get some useful information out of this. Have fun architect-ing :-) !


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Intereseting --- 249 days bug for Oracle on Linux servers

--contributed by Manjunath Ulthi, Senior DBA at Infosys Technologies limited

1 Introduction

Problem: OCI client spins when machine uptime >= 249 days in Linux machines. Once the uptime crosses 249 days the database client hangs and leads to high CPU utilization and server hung state. The user will not be able to connect to the databases This is oracle known bug 4612267.


Solution: This can be handled by applying the patch 4612267.


The patch has been applied in the servers server126, server041 & server120 and tested. After the patch has been applied the client connections were normal after 249 days and all the operations of databases/applications were normal and didn’t encounter any problems.

For further information refer the Metalink Notes

Note: 338461.1: SQL*Plus With Instant Client 10.2.0.1 Hangs, When System Uptime Is More Than 248 Days

Note:4612267.8 : Bug 4612267 - OCI client spins when machine uptime >= 249 days

2 General Instructions

Procedure to apply the patch

1. Download the …