What is different about V Datafile and Dba_data_files?

What is different about V Datafile and Dba_data_files?

Can someone please explain to me what is the difference between dba_data_files and v$datafile views? Both have the same number of records, the only differences I see is that v$datafile view has more fields and some fields are different (v$datafile does not have user-bytes fiels.

What is DBF file in Oracle?

Datafiles are physical files of the operating system that store the data of all logical structures in the database. They must be explicitly created for each tablespace. Oracle assigns each datafile two associated file numbers, an absolute file number and a relative file number, that are used to uniquely identify it.

What is parameterized view in Oracle?

Oracle does not support parameters with Views, but we can always find a workaround. In the case of parameterized views there could be various workarounds. SQL> create view emp_dept_v as 2 select e. empno, e.

What’s the difference between V$ views and DBA _ views?

As Adam Musch pointed out, v$ views run directly against the instance whereas dba_ views run against the data dictionary. Once you understand that, it makes sense why this limitation is in place.

What’s the difference between a DB and a DBA?

Measurements in dBA, or dB (A) as it is sometimes written, are decibel scale readings that have been adjusted in an attempt to take into account the varying sensitivity of the human ear to different frequencies of sound.

What’s the difference between DBA and C filter?

Unlike dBA, its measurements suit low and high frequency sound levels. The C filter literally filters the sounds the microphone picks up in the sound level meter, used more in entertainment venues.

What’s the difference between a DB and a decibel?

First of all, a dB (decibel) is a ratio between two quantities that has been reported on a logarithmic scale. Moreover, dB allows a realistic modelling of human auditory perception, since the ear reacts to relative changes in noise level. In many cases, dBs are followed by a suffix to define a reference variable.