Check a functional index on a table and its metadata
HelloI have a functional base normal index (unique) defined on a table that uses a function of decoding and a combination of the columns of a table.
For example: decode (status, 'A', column1 | column 2, column1 | Column2 | Column3)
Now my question is, how do we ask these functional indices of the database to see what exactly is the function...
On the database when I run a query: -.
Select in all_indexes where index-name =: index_name, *.
She retrieves the name of the stored index code as ncs $00025 (don't remember the exact value).
How will I know what exactly is the function? (from table)
and is it possible that I can query the data that has been indexed by this unique index, so that I can check why unique constraint is violated in some cases?
Thank you and best regards,
Sylvain
How, we ask these functional indices of the database to see what exactly is the function...
select * from user_ind_expressions
Tags: Database
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http://www.Stanford.edu/dept/ITSS/docs/Oracle/10G/server.101/b10755/statviews_1061.htm
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I read the view of ALL_INDEXES here:
http://www.Stanford.edu/dept/ITSS/docs/Oracle/10G/server.101/b10755/statviews_1061.htm
But I still don't know how to query follows:1. display the name of the table, the index name and flag Y/N 'Is the local index' and a flag "is the overall index.
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How to write this query?
My original request:
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That seems Ok to me.
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Yes.
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no selected lineAn extension to what Sybrand said:
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Try to insert a row. You will see your table and index in dba_segments.
See for more information
http://docs.Oracle.com/CD/E14072_01/server.112/e10595/tables002.htm
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I have an old database that has a table of great sys.job$ and the large index on it. (indices are just standard installed indexes nothing we did) However the table has very little data in it now, only 22 rows. Yet between the table and index is > 1 GB in size.
The enforcement team asked me to reorg or shrink the table sys.job$ and explained its large size is probably due to the fact that they believe some process went wrong turned for years resulting in job creation, but his long since been cleaned.
What motivates is to save space in the SYSTEM tablespace and possibly help some query performance.
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Y at - it a taken way supported to reduce the size of this table. Any document referencing.
Yes, there is a way taken in charge.
It's called "Recreate the database"
-------------
Sybrand Bakker
Senior Oracle DBA
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