Query Oracle for information on a Database

dyarosh
dyarosh used Ask the Experts™
on
I am in the process of developing an Application Catalog for our small group.  Part of the App Catalog is to show which databases and tables are used by the application.  I am planning on having a database that contains the Database names that our group currently works with.  What I want to do is given a Database name, query Oracle to get all the information about that database.  For example, I would like to get the following information:
* Tables in the database
* Field definitions for each table in the database
* Views in the database
* Indexes on each table
* Triggers used in the database and the tables associated with the triggers
* Sequences defined in the table
* Materialized Views
* Synonyms
* Public Synonyms
* any other info for the database

I would also like to be able to store the unique id associated with each table in the database so I can assign tables to specific applications.  For example:

Application 1 defined in the Application Catalog uses the Table1 and Table2 tables from the Test database.  The Test database contains 15 tables.  I want to be able to store a value in my table for the Application Catalog that shows the app uses  Table1 and Table2.  I don't want to store the actual table names because they are already defined in ORACLE and I don't want to "recreate the wheel".

I hope this makes sense and any help is greatly appreciated!
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Each oracle database has a view on which you could base your catalog, just click on the link: ALL_OBJECTS

Based on this view you can drill down to the Data Dictionary Views for each object

Author

Commented:
Is there a way to do this from a c# program?
Most Valuable Expert 2012
Distinguished Expert 2018

Commented:
You can do whatever you want with C#.  I suggest you use ODP.Net as the data provider.

You can download it from here:
http://www.oracle.com/technetwork/topics/dotnet/downloads/net-downloads-160392.html?ssSourceSiteId=ocomen

That said:  Why do you want to mix objects within the same schema for different applications?

What you are describing doesn't make any sense.

Create a new schema for each application.  If the apps need to reference objects in the other schema, just create a synonym and grant the proper privs.
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And that the account you will use to login must have SELECT ANY DICTIONARY privilege.

Author

Commented:
Ok.  This is being used to associate databases with an application so we can tell when a database is no longer needed.
Most Valuable Expert 2012
Distinguished Expert 2018

Commented:
>>associate databases with an application so we can tell when a database is no longer needed.

I think you are not familiar with Oracle architecture.

In Oracle a database refers to the files on disk.

A schema is a database user that owns objects.

How do you plan on knowing when a set of database objects is no longer in use?
Geert GOracle dba
Top Expert 2009

Commented:
that's reverse logic
you need to analyze your c programs to see which tables you still need

if you have functionality which is almost never used, like year-end calculations,
checking the database for usage you might miss those tables and drop them

if you want to know if a database is no longer needed
add a logon trigger to it and log all the entries in a table
if no one has logged on for six months ... then it wasn't needed in those six months

if you were to enter the module name for all your apps in the session info,
you might be able to catch about 80% of the data you want
David VanZandtOracle Database Administrator III

Commented:
Just my two cents, but is such an effort going to be useful to your audience?  Like the previous comment, is this something worth maintaining?

When I wear my data architect hat, I'm more likely to go after a relational model / CASE diagram, and business rules so that the developers know what constraints to include.
Want to know if a schema (database) is being used or not? -- Change the password and be ready to listen who complains.
:p

Author

Commented:
Thank you.

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