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, …

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, …

Show all Active SQL for Sessions using v$session and v$sqlarea SQL Code` 1set feedback off 2set serveroutput on size 9999 3column username format a20 4column sql_text format a55 word_wrapped 5begin 6 for x in 7 (select username||'('||sid||','||serial#||') ospid = '|| process || 8 ' program = …

List all open oracle cursors by user or username SQL Code 1set pages 999 lines 300 2col username format a40 3select sess.username as username 4, sess.sid as sid 5, sess.serial# as serial 6, stat.value cursors 7from v$sesstat stat 8, v$statname sn 9, v$session sess 10where sess.username is not null 11and sess.sid = …

Display Session status associated with the specified os process id SQL Code 1select s.username 2, s.sid 3, s.serial# 4, p.spid 5, last_call_et 6, status 7from V$SESSION s 8, V$PROCESS p 9where s.PADDR = p.ADDR 10and p.spid='&pid' 11/ Sample Oracle Output: 1Enter value for pid: 9999 2old 10: and …

Display the users current Session SQL SQL Code 1Select sql_text 2from v$sqlarea 3where (address, hash_value) in 4(select sql_address, sql_hash_value 5 from v$session 6 where username like '&username') 7/ Sample Oracle Output: 1Enter value for username: sys 2old 6: where username like …

Display all Oracle users by the time since last user activity SQL Code 1set lines 100 pages 999 2select username 3, floor(last_call_et / 60) "Minutes" 4, status 5from v$session 6where username is not null 7order by last_call_et 8/ Sample Oracle Output: 1USERNAME Minutes STATUS 2-------------------- ---------- …

Show all the Oracle users connected to the database SQL Code 1set lines 100 pages 999 2col ID format a15 3col USERNAME format a20 4select username 5, sid || ',' || serial# "ID" 6, status 7, last_call_et "Last Activity" 8from v$session 9where username is not null 10order by status desc 11, …