V$SESSION

Identifying Locked Rows in Oracle Database using tables v$session and dba_objects Purpose At 09:00 a user reports that an order screen has frozen. The user pressed Save, and nothing happens. The session is not busy with work. It is waiting. Another transaction changed the same row and has not finished, so the database …

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 A developer reports that an INSERT that should finish in seconds is still running after ten minutes. No error has come back to the application, no timeout has fired, and nothing is moving. In the vast majority of …

Oracle Database: Show Currently Executing SQL Statements Purpose The help desk reports that the database is slow, and you open a session to look. You can see that sessions are connected, but you need to know what they are running. Session names do not tell you that. The SQL text does. It shows whether the load is a …

Oracle Database: Real-Time SQL Tracing for In-depth Performance Insights Purpose This Oracle database technique empowers you to dynamically enable or disable SQL tracing for specific sessions. SQL tracing captures detailed information about SQL statements executed within a session, providing valuable insights into …

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, …

Lists the Contents of the Temporary Tablespace(s), Including Details About Each Temporary Object and Its Associated Session v$sort_usage is the view to open when TEMP fills up: it holds one row per temporary segment in use, with the user, the session, the tablespace and the blocks allocated. Whether the trigger is an …

Lock or Unlock an Oracle User in the Database Purpose A contractor leaves on Friday. A service account password shows up in a chat log. A batch user fails to log in 40 times from an unknown host. In each case the first move is the same: shut the account without dropping it. ALTER USER ... ACCOUNT LOCK does that. The …

Show all Active SQL for Sessions using v$session and v$sqlarea Gain real-time insights into currently active user sessions and the SQL statements they are executing to troubleshoot performance issues and optimize resources SQL Code 1set feedback off 2set serveroutput on size 9999 3column username format a20 4column …

Display Oracle v$session_longops sessions Gain visibility into recently completed long-running operations for monitoring performance and resource usage SQL Code 1set lines 100 pages 999 2col username format a15 3col message format a40 4col remaining format 9999 5select username 6, to_char(start_time, 'hh24:mi:ss …