Global Temporary Table ( GTT) – key facts
The data in a GTT is written to the temporary tablespace, which is not directly protected by redo, so using a GTT improves performance by reducing redo generation. Unfortunately, prior…
Read MoreOracle 12c SQL Plan Directives – Disable | Enable | Use As Hint
What is it? In previous releases the database stored compilation and execution statistics in a shared sql area which is non persistent. Starting in 12c the database can use a…
Read MoreORA-20005: object statistics are locked (stattype = ALL) – Solution
During tuning a query, I found one table has stale statistics. While running gather stats for that table, got below error. Let me demonstrate with a demo table: SQL> execute…
Read MoreIgnore Duplicate Rows (ORA-00001) with the ignore_row_on_dupkey_index Hint
The simplest method is to add a hint to the query to overcome ORA-00001 Added in 11.2, the ignore_row_on_dupkey_index hint silently ignores duplicate values: insert /*+ ignore_row_on_dupkey_index ( acct (…
Read MoreCreate a Virtual Column:
A virtual column applies a function to a column in the table. The database only computes this at runtime. The value is not stored in the table. So instead of…
Read MoreHow to Fix ORA-01450: Maximum Key Length (6398) Exceeded Errors:
The smallest unit of data storage in Oracle Database is the block. This defaults to 8k (8,192 bytes). Each index entry must fit within one block. So the maximum size…
Read MoreHow To Define Connection Filter Settings(t3,t3s) for WebLogic Server Domain Using WLST
APPLIES TO: Oracle WebLogic Server – Version 10.3.6 to 10.3.6 Generic Linux GOAL: If there are a lot of webLogic domains to configure, this document provides an example to define…
Read MoreScript to check temp used by session
set pagesize 10000 set linesize 133 column tablespace format a20 heading ‘Tablespace Name’ column segfile# format 9,999 heading ‘File|ID’ column spid format 9,999 heading ‘Unix|ID’ column segblk# format 999,999,999 heading…
Read MoreFinding Top sqls ordered by elapsed time in a period of time
set head on column module format a20 set lines 1000 pages 1000 prompt SQL Ordered by Elapsed time /*FIND THE SNAP ID*/ set pages 0 col begin_interval_time for a30 col…
Read MoreOracle Statspack Installing and Configuration
Description: This Document for configuring oracle Statspack, schedule auto snapshot and report generation. The Statspack tool is instead of AWR report because AWR is licensed Statspack is non licensed. Steps:…
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