Tagged Questions
0
votes
0answers
44 views
one vs two column index difference when doing JOIN query?
Let`s suppose that alfa,beta and gamma contains milions of rows so we need to create indexes obviously to get optimal performace for this query :
SELECT * FROM alfa
JOIN beta on beta.id = ...
1
vote
1answer
94 views
Change a partitioned global non-unique index that is the primary key to a non-partitioned unique index
One of the largest tables in our system has its primary key setup as a globally ranged partitioned (in huge, useless, multi-billion value ranges) non-unique index. Its values are just a sequence ...
1
vote
1answer
118 views
INDEX Creation Advice Oracle
I have a table that has time data of 2 billion records obtained from the clients. The data has two main columns, date and entity_id.
The attributes date, and entity_id would make a unique pair.
...
4
votes
2answers
1k views
Determine Index Compression Candidates Online
By doing the following I can determine if an index will benefit from compression and how many columns should be included in the compression:
ANALYZE INDEX Owner.IndexName VALIDATE STRUCTURE OFFLINE;
...
4
votes
3answers
756 views
Detect Index Coalesce
Is there a way to know if a COALESCE has been done on an index? Doing one doesn't seem to update the CREATED, LAST_DDL_TIME, or LAST_ANALYZED attributes.
Note: I am not referring to the COALESCE ...
