I have something which might be helpful to u..send email at sakibnawaz@yahoo.com so I could simply reply with the attachment...I don't thing OTN provides any attachment facilities...
let me know
shah
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questions/answers concerning for Job Interview
Attn. to all Oracle Experts:
--------------------------
I have been in a struggle to get the Job as an Oracle DBA, I have been trying my best and already OCP in Oracle8 and going to take for Oracle8i soon.
If anyone of you could help me to provide journal and specific list of questions and answers or only questions, where should I more concentrate, specially interview point of view, like Administration,tuning, backup & recovery and others.
how can I improve the performance of query result if the group of users are complaining about slow processing query, what could be the best answer as a DBA.
I need help just point out hot and critical question that can raise in a interviewer mind, cause most of you already in the field.
Please reply me soon, I would really be grateful to all of you.
thanks,
Obaid
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Answers
here is something which may be helpful to you..
http://www.think-forward.c
good luck
shah
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by: dbalaskiPosted on 2001-02-08 at 12:05:16ID: 5825211
Hi,
Well, this link has a set of question by Mike Ault (noted Oracle author):
http://www.revealnet.com/P
How to Hire (Or be Hired as) an Oracle DBA
Taken from Mike Ault's 1997 Oracle Open World Presentation this paper will attempt to clear up the misconceptions about the Oracle DBA position, specify the levels within the DBA position and give some idea how to interview and be interviewed for Oracle DBA positions. Included in the zip file are interview questions for Oracle, DBA and Developer Candidates.
Where should you concentrate?
Know your material inside and out --- if a dba cannot tell me the basics of oracle (say: Components of SGA, background processes, what is a tablespace, differences with extents/segments etc .... etc), then I would not hire them ! In interviews I seen too many "supposed" DBAs who cannot even answer those basics -- These are the BASICS -- the bread & butter items of the TRADE -- NO EXCUSE for not knowing them -- i've turned down candidates for this reason.
Know what the basics are of Tuning -- what ratios should be -- know what the new features are....
be able to give overviews of the different backup methods --
what is a HOT Backup vs Cold ... Exports... RMAN... what are the pros/cons of each...
How does the database need to be configured to do Hot Backup.?
What are the basics for recovering a Media error?
As far as the question you asked:
how can I improve the performance of query result if the group of users are complaining about slow processing query, what could be the best answer as a DBA.
The answer could be a number of different ways --
assuming you database hit ratios are good, assumming that there is not resource contention, well functioning sort-area.....etc
I would:
0) examine the optimizer settings -- CHOOSE, FIRST_ROWS, ALL_ROWS, RULE
1) Examine the state of the statistics and indexes -- determine if re-collection or rebuilding
2) examine the explain plan & trace files -- use TKPROF to see exactly what is happening with the query
This will give indications of all the access paths (and possible addition indexes needed)
Also an indication of returned rows and possible optimzer settimg (maybe collecting histograms).
From this point, you should have a good feeling if there can be things done to optimize the query -- or if it can even be optimized...
3) Experiment with hints, driving tables on joins, join methods, possible restructuring of the where clause.... View the explain plans to determine impacts.. Could the tables be a candidate for the multiple buffer pool feature of 8i? Could we utilize IOTs or Function Based Indexes?
Hope this answers your question(s)
sincerely,
dBalaski