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SIG Event

Oracle Database 11g Release 2: Flash Cache and Exadata V2

3 years ago
by Marco Gralike in

So, if I would wonder what is the purpose of this almost "hidden" feature called flash cache and were this came from (also see my post Oracle RDBMS 11gR2 – Flash Cache), now I know. I didn’t have the chance to follow Mr. Ellison’s launch event, but reading Alex Gorbatchev’s blog post on the Pythian web site Unveiling the OLTP Oracle Database Machine & Exadata v2 is enough explanation in the "why" and "how". Flash cache is one of the pillars that make the synergy with the Sun Exadata machine.

As Alex stated:

Exadata Storage Servers

Storage Servers are based on Sun Fire X4275. Again top of the shelf Intel Xeon 5500 Nehalem processors.

Capacity increased — SAS disks are 600 GB (+33%) and SATA disks are 2 TB which doubles what ODBM v1 offered. We all know that big disks are bad but that’s where Sun FlashWire technology comes into play with flash cache on the controllers (5+TB for the full ODBM).

This is what Ellison said about Flash cache:

“These are not Flash disks. Make no mistake — these are no Flash disks. This is a memory hierarchy made up of DRAM in our database servers and Flash in our storage servers with very sophisticated algorithms, not simple LRU — we know for doing a More >

SIG Event

Oracle RDBMS 11gR2 – New PREPROCESSOR Syntax for External Table Use

3 years ago
by Marco Gralike in

One of the other small but very useful new features in the Oracle 11gR2 database is the addition of a PREPROCESSOR parameter for the create EXTERNAL table statement. This PREPROCESSOR clause gives you the ability to execute an executable or executable (shell) script that handles your data before it gets presented. The PREPOCESSOR clause is part of the ORACLE_LOADER access driver

The Oracle 11gR2 Database Utilities Manual states:

<code>The preprocessor program converts the data to a record format supported by the access driver and then writes the converted record data to standard output (stdout), which the access driver reads as input. SQL&gt; CREATE TABLE xtab (recno varchar2(2000)) 2 ORGANIZATION EXTERNAL ( 3 TYPE ORACLE_LOADER 4 DEFAULT DIRECTORY data_dir 5 ACCESS PARAMETERS ( 6 RECORDS DELIMITED BY NEWLINE 7 PREPROCESSOR execdir:'zcat' 8 FIELDS (recno char(2000))) 9 LOCATION ('foo.dat.gz')) 10 REJECT LIMIT UNLIMITED;</code> <code> SQL&gt; CREATE TABLE xtab (recno varchar2(2000)) 2 ORGANIZATION EXTERNAL ( 3 TYPE ORACLE_LOADER 4 DEFAULT DIRECTORY data_dir 5 ACCESS PARAMETERS ( More >
SIG Event

Oracle 11g Release 2 New Features

3 years ago
by Marco Gralike in

Oracle 11g Release 2 for Linux can now be downloaded via the Oracle Technology Network here:

The documentation and whitepapers can be found via the following link:

The online manuals are also already online and can be found here:

Enjoy all the cool and fun new features like, among others, the new structured XMLIndex, new partitioning options for Binary XML and Object Relational XML storage, Oracle Editions, Dataguard and RMAN enhancements, Restartable database features, Securefile compress low enhancement, External table enhancements, etc, etc, etc.

Certainly the RAC enthousiast will be getting there share this time with all the new features available like the new Oracle file system that also besides the database parts, accepts software and other files.

As always, we will keep you posted in the upcoming days and weeks and / or meet us at Oracle Open World 2009.

Marco

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