| Basic questions on Oracle [message #418805] |
Tue, 18 August 2009 10:32  |
polsol
Messages: 7
Registered: September 2008
Location: Kuwait
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Junior Member |
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I'm a newbie at Oracle compared to most and require some basic information. Hoping this is the right forum to answer my questions.
Having read the 10i manual (one of them) some time back I'm still confussed about the tablespaces and schema relationship. Is there a simple, concise, description of this topic anywhere?
Secondly, I was talking to a programmer who wrote our current 8i application. I was asking why he didn't split up the tables et al into different schemas - such as production, sales, finance etc. He replied that by doing so would have an adverse affect on system resources and performance. Is this correct?
From memory the 'sample' schema on the 10i 'trial version' had an 'HR' sample schema. This would indicate to me (rightly or wrongly) that splitting departments by schema. Seems the way to go for access privledges. How does one normally construct a DB? One large schema or smaller schemas (which would appear more manageable to me)? Any thoughts on the correct way to construct an Oracle DB?
Thanks in advance and excuse my Oracle ignorance!
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| Re: Basic questions on Oracle [message #420183 is a reply to message #418805] |
Thu, 27 August 2009 07:42  |
arungulia
Messages: 2
Registered: August 2009
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Junior Member |
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tablespace :
it is a logical object in oracle database which have one or more datafile. these datafile are phyical objects means we know exact location on disk. we know phyical address of datafile. schema is user in oracle. who creates table and ohter objects in database. user can have write permission on different tablespaces. like in one tablespace his tables are created, on other its indexes are created.
in big database we
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| Re: Basic questions on Oracle [message #420188 is a reply to message #420183] |
Thu, 27 August 2009 08:26 |
joy_division
Messages: 4963
Registered: February 2005
Location: East Coast USA
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Senior Member |
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| arungulia wrote on Thu, 27 August 2009 08:42 | tablespace :
it is a logical object in oracle database which have one or more datafile. these datafile are phyical objects means we know exact location on disk. we know phyical address of datafile. schema is user in oracle. who creates table and ohter objects in database. user can have write permission on different tablespaces. like in one tablespace his tables are created, on other its indexes are created.
in big database we
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Did you fall off a cliff?
Proper grammar would help us understand if you were asking a question of making a statement. If you are saying that tables and indexes should be in separate tablespaces, you are basing this on very outdated information at best, or simply incorrect information.
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| Re: Basic questions on Oracle [message #420212 is a reply to message #418805] |
Thu, 27 August 2009 09:59 |
polsol
Messages: 7
Registered: September 2008
Location: Kuwait
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Junior Member |
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Thank you Michel and Black Swan for the reference.
However, whilst this reference provides details as to what Tablespaces et al are, in the first instance it doesn't explain why one would need say, more than one Tablespace.
Additionally whereas it's possible to split one schema between tablespaces, again, it doesn't say why one would want to do this.
Is there a document which provides details of what I would call 'Best Practices' which describes alternate DB 'set-ups' for different usage requirements?
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| Re: Basic questions on Oracle [message #420237 is a reply to message #420222] |
Thu, 27 August 2009 11:35 |
polsol
Messages: 7
Registered: September 2008
Location: Kuwait
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Junior Member |
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Thanks for your reply Michel,
Following your analogy, would this be something akin to having car air conditioning in Alaska/Siberia?
From what I gather, Tablespaces are 'Bells and whistles'. Sort of saying to IBM/MS, "well we have a 'silent' whistle (sic)' and you don't"?
In other words, Tablespaces are superfluous?
My original question actually arose from a statement from our ERP vendor that using multiple schemas was detrimental to Oracle system performance - which seems a little odd to me as the 'starter' schema in 10g is called 'HR' - which would seem to indicate that splitting a DB (Tablespace) by 'departmental' schemas is not a bad thing (especially when one considers access privledges).
In reality, I'm trying to understand the Oracle 'topology' and why Oracle see fit to do things the way they do.
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| Re: Basic questions on Oracle [message #420239 is a reply to message #420237] |
Thu, 27 August 2009 12:36 |
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Michel Cadot
Messages: 68665
Registered: March 2007
Location: Nanterre, France, http://...
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Senior Member
Account Moderator |
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In addition, they are aso a way to separate data that you want to manage in different ways.
For instance, if you want to back up or purge departments at different frequencies, or if you want to back up them in different locations and so on.
Regards
Michel
[Updated on: Thu, 27 August 2009 12:38] Report message to a moderator |
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