Category: 11gR2

Oracle 11gR2 Database Flash Cache Patch For Oracle Enterprise Linux

Just a quick note that there is now a patch for the 11.2 Oracle Enterprise Linux (OEL) database ports to enable the database flash cache (not to be confused with the Exadata flash cache). Go to the My Oracle Support site [link] and search for patch 8974084 – META BUG FOR FLASH CACHE 11.2PL BUGS TO BACKPORT TO OEL

You can download Oracle Database 11g Release 2 from OTN.

Note: The db flash cache is already built into the Solaris ports so no patch is needed.

Top 10 Oracle 11gR2 New Features

In catching up on blog posts I see that Jonathan Lewis, Christian Antognini and Nuno Souto picked up on the deferred segment creation new feature in Oracle 11gR2. In keeping with the theme, I thought I’d put together the top 10 new features in Oracle Database 11g Release 2 (11.2) that I consider significant.

  1. Analytic Functions 2.0
  2. Recursive WITH Clause
  3. Preprocessing Data for ORACLE_LOADER Access Driver in External Tables
  4. In-Memory Parallel Execution
  5. Auto Degree of Parallelism (Auto DOP) and Parallel Statement Queuing
  6. Significant Performance Improvement of MV On-Commit Fast Refresh
  7. Database Resource Manager Instance Caging
  8. ASM Intelligent Data Placement
  9. Database File System (DBFS)
  10. Hybrid Columnar Compression

In future posts I’ll dive into some of these in more technical detail but for now I thought I’d throw my list out there to raise awareness of the things I am looking at as a database performance engineer.

Oracle Database 11g Release 2 Is Now Generally Available

Just a quick post to spread the news that Oracle Database 11g Release 2 is now generally available. Download it for Linux today. See the press release for the usual details.

Here is an interesting tidbit of info from a PC World article:

The new release is the product of some 1,500 developers and 15 million hours of testing, according to Mark Townsend, vice president of database product management.

Update: In reading Lowering your IT Costs with Oracle Database 11g Release 2 I noticed this interesting tidbit:

With Oracle Datanase 11g Release 2, the Exadata Storage servers also enable new hybrid columnar compression technology that provides up to a 10 times compression ratio, without any loss of query performance. And, for pure historical data, a new archival level of hybrid columnar compression can be used that provides up to 40 times compression ratios.

Hybrid columnar compression is a new method for organizing how data is stored. Instead of storing the data in traditional rows, the data is grouped, ordered and stored one column at a time. This type of format offers a higher degree of compression for data that is loaded into a table for data warehousing queries. Different compression techniques can also be used on different partitions within a table.

Cool, Exadata now has column organized storage. Things are certainly getting very interesting in Exadata land.

Be sure to check out the Oracle Database 11g Release 2 New Features Guide for more goodies.

Update 2: For those attending OOW 2009, there will be a session on the new technology – Oracle’s Hybrid Columnar Compression: The Next-Generation Compression Technology (S311358) on Tuesday 10/13/2009 13:00 – 14:00.