Category: SQL scripts

If your index is NONUNIQUE, you cant enforce Index Unique Scan.

One test case today i found with copy command. When we are using sqlplus copy command with “APPEND” clause, and if source table contains any NUMBER datatype without Precision and Scale, then COPY statement fails with error indicating “NUMERIC ERROR and Number data type precision is higher than 38 digit”.

For Index ( Range Scan and Fast Full Scan Setings )in query (1) RULE uses index range scan (2) CBO uses Index fast full scan ( called Index FFS ) Here CBO uses multi block IO reading as per db_file_multi_block_read_count). By default, the CBO costs physical IO and logical IO the same. So it ignores…

Read More “Optimizer_Index init.ora parameter explaination.” »

Executing CTAS statement having TO_LOB(LONG COLUMN). For example: create table blah as select GNT_ID.nextval, 1060 as gnt_ref_id, org.gnt_id, org.gnt_group_note, org.gnt_language, to_lob(org.gnt_text_string) as gnt_text_string, org.gnt_text_emphasize from asra_002.gnt_groupnote_txt org where org.gnt_group_note in (select gnr_note from asra_002.gnr_groupnote_ref)

How to Copy Data from a Table with a LONG Column into an Existing Table ======================================================================= Purpose: ======== The purpose of this article is to provide a working example of how to COPY data from a table with a LONG column into another existing table with the same structure definition. This document is especially useful…

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DBMS_UTILITY Oracle provides two procedures under the DBMS_UTILITY package related to statistics generation. (Oracle recommends use of DBMS_STATS package for generating statistics). DBMS_UTILITY.ANALYZE_SCHEMA This routine will generate statistics on an individual schema level. It is used for analyzing all tables, clusters and indexes. It takes the following parameters: schema – Name of the schema method…

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10:17:18 SYS@WEBP:-> execute dbms_utility.analyze_schema(‘CS’, ‘COMPUTE’, NULL, NULL, NULL);

———————————————- Gathering statistics with DBMS_STATS ———————————————- DBMS_STATS.GATHER_TABLE_STATS DBMS_STATS.GATHER_TABLE_STATS gathers statistics for a table and its columns, and optionally the associated indexes. Call syntax dbms_stats.gather_table_stats(ownname, tabname, partname, estimate_percent, block_sample, method_opt, degree, granularity, cascade, stattab, statid, statown); The first two parameters are mandatory, the rest are defaulted to a value. ownname – owner tabname – table name…

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create or replace package subs_cipher is function scramble ( obfs_in varchar2 ) return varchar2; — pragma not required as of 8.1.5 pragma restrict_references( scramble, wnds, wnps, wnps); function unscramble ( obfs_in varchar2 ) return varchar2; — pragma not required as of 8.1.5 pragma restrict_references( unscramble, wnds, rnds, wnps ); end; create or replace package body…

Read More “VIvek Encryption Package and Its Usage” »

In the following statement, user hr on the remote database defines a fixed-user database link named local to the hr schema on the local database: CREATE DATABASE LINK local CONNECT TO hr IDENTIFIED BY hr USING ‘local’;