RE: Development projects: Multiple databases v/s multiple schemas

A.Bahar Fri, 20 Jun 2003 08:29:02 -0700

Title: RE: Development projects: Multiple databases v/s multiple schemas

Hi Rajendra ...

For Example ,

There is one instance and two project on this instance.

ProjectA and ProjectB.

beetween 10:00 am and 11:30 am , ProjectA realized via numerious sessions

30 times wait for event of "free buffer inspected"

1000 block "consistent get"

2000 block "buffer get"

100 block "physical read"

beetween 09:30 am and 11:30 am , ProjectB realized via numerious sessions

240 times wait for event of "free buffer inspected"

500 block "consistent get"

500 block "buffer get"

5100 block "physical read"

And you take a performance report for beetween 09:00 and 12:00 ,

And values are

270 times wait for event of "free buffer inspected"

1500 block "consistent get"

2500 block "buffer get"

5200 block "physical read"

cahce hit ratio 1-(1500+2500)/5200 = 0.23

Question : which project cause to these figurs.

-----Original Message-----
From: Jamadagni, Rajendra [mailto:[EMAIL PROTECTED]
Sent: Friday, June 20, 2003 4:05 PM
To: Multiple recipients of list ORACLE-L
Subject: RE: Development projects: Multiple databases v/s multiple schemas

if your schema will be cross-referencing, I vote for ONE db with multiple schema. This way, any changes in one schema immediately affect others and can be controlled. If you _know_ (guaranteed by management) that the schema will _never_ cross reference, then I'd still go for single DB, unless there is a proven need for separate database.

I know developers like to have a whole database for themselves, but unfortunately all schema co-exist in the database, so should developers in one DB.

A. Bahar, I didn't understand your point, so pardon me. What statistics are we talking here? You mean if ytou have on database per schema, table stats will be different than having all schema in one DB ??

Raj
--------------------------------------------------------------------------------
Rajendra dot Jamadagni at nospamespn dot com
All Views expressed in this email are strictly personal.
QOTD: Any clod can have facts, having an opinion is an art !

-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]]
Sent: Friday, June 20, 2003 9:19 AM
To: Multiple recipients of list ORACLE-L
Subject: RE: Development projects: Multiple databases v/s multiple
schemas

if you create separete databases , you can monitor statistics of each of them indivudually. Otherwiese database statistics will be affected from multiple projects .

-----Original Message-----
Sent: Friday, June 20, 2003 2:19 PM
To: Multiple recipients of list ORACLE-L

Hi,

For multiple projects we are planning to have a centralized server(as opposed
to multiple servers, to improve managability) which all the development teams
will use for their backend work.

Now there are 2 ways in which to provide them access.

1. Have only 1 database for each version of Oracle Server installed and
create schemas for individual teams for their development work.
2. Create a separate DB for each project team.

I want to know the pros and cons for both the approaches.

Any ideas and suggestions are most welcome.

Regards
Naveen

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