When indexes are stored in the Oracle?
I just read that "the index blocks have been already in memory. Can someone explain this please? I thought that the indexes are waiting in the data file?
In other words, I'm learning the location of index.
Thanks for your help.
NightWing wrote:
EdStevens wrote:
Introduction to computing systems 101: (in other words, really, really basic and nothing to do with Oracle, or any other application)
The data are stored on a physical medium, such as disk or tape.
Data cannot be used (acted on, analyzed, etc.) until it is in memory.
For Oracle, this means a block of data (and an index is simply a particular piece of data) must be read (disk) storage and placed in memory (buffer) before it can be used for anything.
When you say "data cannot be used (acted on, analyzed, etc.) until it is in the memory." Then, please correct me if I'm wrong, the first operating system or get the expected data from disk to memory, then these data are used in memory.
Is there any document relating to this information.
Thank you for your remarkable knowledge.
Do you want to confirm? You know, it would be far too costly to try to read the disc things and process. That's why Oracle would bring the contents of the disc in its structure of memory (buffer cache) before he would let you access and process them.
Aman...
Tags: Database
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