tablespace with multiple files, how is the space consumed?

I have a tspace1 tablespace that has 2 data files, and there are 2 physical disks /data1 /data2 each of these mount points are a partition on a separate disk

disks1 /data1
/data2 disk2

/Data1 is 80% used (two data files are on /data1)
/Data2 is not yet used


I'm corect I say ave shouldh created a data /data2 rom files a day? to improve performance?

now the data files im in need of a 3rd and fourth creation... can I create these new in /data2 and leave it as it is?

or I'll offer one of the largest in /data2 so that the data is distributed across two discs? and then create datafile3 in /data1 and datafile4 in /data2?

Thank you

EdStevens wrote:

Several years ago, I ran a few tests which showed files written in a responsive way. (In fact, it was the extents allocated in round robin. A segment is only designed for in previously allocated extensions). When I first posted on this forum a few years ago, someone responded with their own test results showing a file being completed before the other is used. If the answer is, as almost always... "it depends".

And at the moment I don't remember what was decisive.

One of the factors would have been version, of course.

Robin is the basic strategy for extensions to a segment, but automatic extended allocation allocation (which start with 64 KB extents before moving on to 1 MB and so on) presented a special case where Oracle would stick with a single file for the first megabyte of the segment.

Until quite recently, however, the first measure of a segment is always put in the first file of the table space, so if you have a lot of object that need to have a degree awarded then you could end up with more space to the first file in use and very little space allocated from the rest. I don't remember when that changed, but I remember seeing a note on MOS describing this anomaly and explaining how the imbalance had been fixed by follow-up which file should be used then when a new segment was to be created.

Concerning
Jonathan Lewis
http://jonathanlewis.WordPress.com
Author: core Oracle

Tags: Database

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