Knowledge Center IT Architecture
As of Oracle 10g it’s possible to recover (or wind forward) a RMAN disk copy of the database to a specific time in the past. This type of backup is quite suitable for big databases (> 100GB), because you have to perform a time consuming full backup only once. All other backups to disk will be incremental ones, and with block change tracking on, these backups are done in a fraction of the time a full backup takes.
A setup like this needs a bit of disk space. Using the FRA (Flash Recovery Area, but from 11gR2 on it stands for the more appropriate Fast Recovery Area ), you may need to size it to 2 times the size of the database, or even more, depending on the number of database transactions. However, till now I have been able to convince most clients I worked for of the benefits of this kind of backup regime, and to provide or even buy the extra disks necessary.
My favorite configuration of a RMAN database backup is as follows: In the first week, on a Sunday, a onetime full (level 0) disk backup (copy of datafiles) to the FRA, and a subsequent backup of the database copy to tape. From then on, every day an incremental level 1 disk backup, and the backup to tape of all archives and More >
Hello, you project manager/team leader. I expected this title to grasp your attention. Would you like to know how to improve the performance of your team members?Â This can be done without massive statistics or an expensive performance improvement program. This magic pill is called positive feedback. Just give your team members the credits for their work and compliment them for their achievements.
As a project manager we are aimed on the end result. In our day to day job we are focused on the things that are not yet done and the things that could go wrong. This focus on future result and possible impediments make us forget the past achievements of our team.
Agile software development, the principles. Principle 11: The best architectures, requirements, and designs emerge from self-organizing teams.1
"To help publicly held companies facilitate the preparation, publishing and automatic exchange of financial statements in XBRL (eXtensible Business Reporting Language), Oracle will embed UBmatrix, Inc.’s leading XBRL technology into Oracle’s Enterprise Performance Management (EPM) System, Oracle announced today."
"Oracle and UBmatrix are also working together to provide enterprise class storage and management for XBRL-based information in Oracle® Database 11g. Using Oracle Database’s XML DB feature, organizations can easily and quickly store, access and query their XBRL data."
A lot of you might ask themselves: "Who are or what is UBMatrix?" and "How does it all fit in…?"
UBMatrix is one of those small but cool companies that have an idea and drive that idea to bigger heights. Their ideas about how to deal with XBRL and how to make it more succes full are very innovative. XBRL is an open standard to exchange and/or embed business and financial related data via XML. "Nothing more and nothing less…", but applying it has a great impact to other More >
During the years I have a lot of times encountered performance problems that ended up to be fast queries (less than 10ms) which are executed very much. In these situations the execution plans, from such queries can look like:
OPERATION OPTIONS OBJECT# NAME
-------------------- -------------------- ---------- -----------------------------------
SELECT STATEMENT .
SORT ORDER BY .
TABLE ACCESS BY INDEX ROWID 120713 XXX.TABLE_WITH_MANY_COLUMNS
INDEX RANGE SCAN 121558 XXX.INDEX_WITH_FEW_COLUMNS
In a lot of cases we deal with a query for example which is returning fewer columns than exists in the involved table like four, from an involved table having twenty columns. Although the execution plan looks already pretty “OK”, it still results in a query which is in top three most resource taking queries.
To enhance the query we can use “Fat Indexes” or nowadays better known “Tapio Indexes” (I call them like that nowadays). What are these kind of indexes…. In More >