Interpretation of the predicate information and filter explain plan

If anyone can help understand how the effects of operation predicate and filter execution plan.or how can I complete the transaction descriptor or filter chosen by the optimizer is not optimized.

User445775,

Paraphrasing I provided in my previous post was on page 74 of "fundamental Oracle cost-based.

How the word explanation...

Suppose you have a database table that contains all phone numbers and addresses of individuals in a State. A query is run to find user445775 in the city named 'Redmond '. Assume that the query looks like this:

SELECT
  PHONE
FROM
  PHONE_NUMBERS
WHERE
  CITY = 'Redmond'
  AND FULL_NAME = 'user445775';

Suppose that there is no index on the table. The DBMS_XPLAN would show two predicates applied during a comprehensive analysis of the filter - this probably indicates an ineffective path, especially if there are a very small percentage of people that match the WHERE clause on the table restrictions.

Now, suppose that an index is created on the CITY column. The DBMS_XPLAN would show an access descriptor applied to the index on the CITY column and a predicate to filter on the table access by index for the FULL_NAME. We have eliminated a large number of possible lines by applying the predicate of access to directly access the rows with the city of interest and then filtered those names that were not "user445775". It is not terribly effective, especially if there are a large number of people to 'Redmond' which should be filtered.

Now, suppose that we drop the index on the CITY column and create an index on the FULL_NAME column. The DBMS_XPLAN would show an access descriptor applied to the index on the FULL_NAME column and a predicate to filter on the table access by index for the CITY column. This could be a quite effective plan if there is only a few lines in the table with 'user445775' FULL_NAME, as a few lines will be ignored after access to the index to find those with CITY = 'Redmond '.

Now, suppose that we drop the index on the FULL_NAME column and create a composite index over the CITY, FULL_NAME. The DBMS_XPLAN would show a predicate of access applied to the index on the columns of the CITY and FULL_NAME and it would not be a predicate to filter on the table access by index - in this case, it will reject all the lines once retrieved by index access.

Page 211 "Troubleshooting Oracle performance" also shows a clear explanation of the predicates access and filter.

Think of access predicates (on the index at least) as throwing the lines until they are retrieved from the disk (or memory) and filter predicates such as throwing the lines after they are retrieved from the disk (or memory).

Charles Hooper
IT Manager/Oracle DBA
K & M-making Machine, Inc.

Tags: Database

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