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A DBA should know the database theory
deeply.
Knowing much more is less useful than
knowing some things deeply.
Mastering the fundamental knowledge is
very important.
I interviewed some of DBA candidate. Some
of them said they had many years’ experience but when asked what is instance
what is database they can not tell clearly. It is hard to image that they said
they were familiar with the RAC.
Every DBA has the boundary of database
knowledge even though he had learned all the knowledge. Their memory is
limited, the knowledge will be forgotten if they have no chance to be applied
in the real situation and it is almost impossible to have the chance to apply
all in the real environment.
So I never think it is fair to ask a DBA
how to set an implicit parameter in the dbms_repair package. What can be proven
even he did know it? But instead that you can resolve the issue if you
understand what is rootcause correctly even you do not know how to take the
specific actions.
Surfing the details from the internet is
possible to give you right next steps.
The OS knowledge and Cluster knowledge is
very useful for a DBA.
These skill sets help you more qualified
to the current or future position. Anyone who has worked as a DBA would know that
the Database is usually "guilty until proven innocent." Every
performance problem gets blamed on the database regardless of its true source
cause or not.
So it is necessary for a DBA to know enough
OS
and
network
knowledge. Especially to combine them with database knowledge to solve
the database performance problems or sometimes OS or network problems.
Does it sound
scared?
Too many things
need you to learn?
I do not think
so.
The most
important is to learn the basic knowledge then learn to what is it.
We need not to
focus on how to do it too much.
As long as what
is it what can it bring to us.
When the new releases come we should try to know what is it then when we
need to use it we can find the details about it.
We can keep up with it if we only focus what it is.
Reaching every detail is wasting you valuable time unless you can find
chance to apply it.
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