Oracle Database: Understanding Lock Conflicts with dba_lock and Column Formatting Purpose This Oracle SQL query is designed to investigate and understand lock conflicts within your database, particularly those causing performance bottlenecks. It leverages the dba_lock view to expose critical lock information in a …

Identifying Locked Rows in Oracle Database using tables v$session and dba_objects Purpose This Oracle query pinpoints the exact row a specific session is waiting on due to a lock. It first finds the locked object and row location, then constructs a ROWID to fetch and display the entire locked row from the table. Sample …

Identify Locked Objects in Oracle Database using v$locked_object, dba_objects, v$lock and v$session Purpose The provided Oracle Database code is a SQL query designed to identify locked objects within a database. It provides detailed information about the locked objects, including the username, session ID, object name, …

Enabling Disabled Foreign Key Constraints in Oracle Database using dba_constraints Purpose This SQL query generates a list of SQL statements that can be executed to enable all disabled foreign key constraints in an Oracle database. Sample SQL Command 1set lines 100 pages 999 2select 'alter table …

Optimizing Undo Retention in Oracle Databases We will explain how to optimize the undo_retention parameter in Oracle databases using the SQL command ALTER SYSTEM SET undo_retention = 500 SCOPE = MEMORY;. Understanding this parameter is crucial for effective transaction management, rollback capabilities, and maintaining …

Real-Time Oracle Rollback Detection: Is Your Database Undoing Changes? This SQL query monitors real-time rollbacks in Oracle databases. It identifies which sessions are actively undoing changes and tracks their progress by observing the used_ublk value (the number of undo blocks in use). When used_ublk reaches zero, …

Creating a Temporary Tablespace in Oracle Database This guide explains an Oracle Database SQL code snippet for creating a temporary tablespace named temp, its purpose, key points, and insights. Sample SQL Command 1create temporary tablespace temp 2tempfile '<file_name>' size 500M 3/ Create a Temporary Tablespace named …

How to Query User Quotas in Oracle Database The code below retrieves and displays information about user quotas on all tablespaces excluding the temporary tablespace (TEMP) on a Oracle database. Sample SQL Command 1col quota format a10 2select username 3tablespace_name 4decode(max_bytes, -1, 'unlimited', ceil(max_bytes …

Description of Oracle Database SQL code for Showing Tablespace Files This code displays information about the datafiles composing a specific tablespace in your Oracle database. Here's a breakdown of its purpose, components, and key points: Show thea data files that comprise a tablespace Sample SQL Command 1col …

Description of Oracle Database SQL code for Identifying Tablespaces Needing Space This code helps identify tablespaces requiring additional space to maintain an 80% utilization threshold in your Oracle database. Below is a breakdown of its purpose, components, and key points: Sample SQL Command 1set pages 999 lines 100 …