Updating index on oracle table

Posted by / 12-Dec-2017 01:06

Updating index on oracle table

Of the three mechanisms, index compression and basic table compression are part of the core product, while OLTP compression is part of the separately licensed “Advanced Compression Option (ACO)”.

In this first article we will restrict ourselves to creating data using basic table compression, leaving the question of updating and deleting compressed data to the second article, which will lead us into “OLTP” compression in the third article.

Every time a record is inserted, all of the indexes have to be updated.

If the column of an index is updated, the index has to be updated.

Stale statistics can lead to poor geodatabase performance.

Data Management Tools Rebuild Indexes: Updates indexes of datasets and system tables stored in an enterprise geodatabase.

Analyze Datasets: Updates the database statistics of base tables, delta tables, and archive tables, along with the statistics on those tables’ indexes.

Here are 5 pieces of SQL that will create and populate a table with a copy of the first 50,000 rows of the view all_objects on a database running 11.2.0.3; after running each one I collected stats on the table and ran a query to report the number of blocks in the table, and a few other details about the table.Execution Plan ---------------------------------------------------------- Plan hash value: 1984512805 ---------------------------------------------------------------------------------------- | Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | ---------------------------------------------------------------------------------------- | 0 | UPDATE STATEMENT | | 92 | 1656 | 4 (0)| | | 1 | UPDATE | UNIQ_PK_IDX_TST | | | | | |* 2 | INDEX RANGE SCAN| UNIQ_PK_IDX_TST_PK | 92 | 1656 | 3 (0)| | ---------------------------------------------------------------------------------------- Predicate Information (identified by operation id): --------------------------------------------------- 2 - access("UNIQ_KEY" update uniq_pk_idx_tst 2 set someother = null 3 where uniq_key between 60; 91 rows updated.Execution Plan ---------------------------------------------------------- Plan hash value: 1984512805 ---------------------------------------------------------------------------------------- | Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | ---------------------------------------------------------------------------------------- | 0 | UPDATE STATEMENT | | 92 | 1656 | 4 (0)| | | 1 | UPDATE | UNIQ_PK_IDX_TST | | | | | |* 2 | INDEX RANGE SCAN| UNIQ_PK_IDX_TST_PK | 92 | 1656 | 3 (0)| | ---------------------------------------------------------------------------------------- Predicate Information (identified by operation id): --------------------------------------------------- 2 - access("UNIQ_KEY" The bytes of redo generated by the update for the non-unique index is 23440.This tool is used in enterprise geodatabases to rebuild existing attribute or spatial indexes.Out-of-date indexes can lead to poor geodatabase performance.

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