As you see from the blogroll page I follow over 140 Oracle DBA related blogs and all blog aggregators from orana.info. I try to read updates from all of them but this huge amount of different source of information about different topics started to blow my mind. I start not to remember what I read and which one was useful in technical context, and most of the blog headers do not match with my future search criteria. For these reasons, I decide to write my own weekly blogroll report just for indexing technical oracle blog posts with my own keywords. ( Log Buffers of Pyhtan Group are very nice but not enough) . I am planning to write every Friday night. If you find anything useful please leave a comment so the post will be complete.
Here is this weeks selection.
1-How to deal with memory leaks by using memory dumps. (PGA leak bug)
Jonathan Lewis – PGA Leaks
Dion Cho – Troubleshooting PGA leak with PGA heap dump
2- How to fix ASM disk header
Jason Arneil – Fixing up ASM Disk Header Corruption
3- How to use Perfsheet and TPT tools for Diagnosing RAC wait events
Karl Arao -Diagnosing and Resolving “gc block lost”
4- How to use XPLAN tool of Alberto Dell’era
Alberto Dell’era – Optimizing SQL statements with xplan
5- How CBO use Dynamic Sampling on partitioned tables
Randolf Geist – Dynamic sampling and partitioned tables
6- How to limit query time with Resource Manager
Martin Ruthner – Limiting Query Runtime Without Killing the Session
7- How Oracle choose tablespaces for interval partitioning
Yasin Baskan – Tablespace selection in interval partitioning
8- DB_CACHE_ADVICE bug causes simulator lru latch
Don Seiler – Turn Off db_cache_advice To Avoid Latch Contention Bugs
9- CBO and INDEXES for beginners Part – 1
Richard Foote – The CBO and Indexes: An Introduction (Absolute Beginners)
10 – How to unload data with Data Pump and External Tables – How to move data between servers with DBMS_FILE_TRANSFER packages
Jean-Pierre Dijcks – Unloading data using External Table and Data Pump
11- How to exclude scan on single paths with ASM multipathing
Surachart Opun – Check the device ASMLib on multi-path
12- PL/SQL Functions and their CBO costing
Adrian Billington – pl/sql functions and cbo costing
13- Tutorial for grouping rows with group by
Joe Fuda – Grouping Rows with GROUP BY
Oracle Forums – (The ones I caught)
1- db writer processes and working data sets
http://forums.oracle.com/forums/thread.jspa?threadID=909105&messageID=3528668#3528668
2- Performance tuning issue on parallel query
http://forums.oracle.com/forums/thread.jspa?threadID=912434&start=0&tstart=0
3- What should be the value of Optimizer_index_cost_adj in oracle 9i (they are back 
)
http://forums.oracle.com/forums/thread.jspa?threadID=912028&messageID=3535406#3535406
These are all for this week. Hope it will be helpfull to find the right blog posts for you
