Identify Waits by Datafile in Oracle using tables v$datafile and x$kcbfwait Purpose In Oracle databases, waiting events often indicate performance bottlenecks. This SQL query helps you pinpoint which datafiles are associated with the most wait events. By understanding where waits are occurring, you can take targeted …

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 …

Oracle Database: Uncover Blocking Sessions with a Powerful SQL Query using v$lock Purpose Identify and resolve performance bottlenecks in your Oracle database by detecting blocking sessions using this powerful SQL query. Gain insights into the query's mechanics and learn how to optimize your database for smoother …

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, …

Oracle Database: Show Currently Executing SQL Statements Purpose This Oracle SQL query allows you to monitor and view the SQL statements that are actively running in your database. It provides insights into the current workload and helps identify resource-intensive or long-running queries that might impact performance. …

Oracle Database: Show All Table Constraints for a User using dba_constraints Purpose This Oracle SQL query is designed to retrieve a comprehensive list of all constraints associated with tables owned by a specific user in your Oracle database. Constraints are essential rules that ensure data integrity and consistency. …

Oracle Database: Identifying Parent Tables for Repair or Re-import using dba_constraints Purpose When working with Oracle databases, ensuring data integrity is paramount. Foreign key constraints play a crucial role in maintaining relationships between tables, but disabled constraints can signal potential issues that …

Oracle SQL: Finding Missing Foreign Key Values (ORA-02298) Purpose This Oracle SQL query is designed to help identify missing foreign key values within your database. This is particularly useful when troubleshooting the ORA-02298: cannot validate (constraint_name) - parent keys not found error, which indicates a …

Oracle Database: Deep Dive into Session Statistics Purpose This Oracle SQL query is designed to retrieve a snapshot of active session statistics for a specific session within your Oracle database. Session statistics provide invaluable insights into the current activity and resource utilization of a particular database …