--===========================================================================
-- Copywright 2002, Chet West & Joel Crainsshaw (http://www.OracleTricks.com   
--=============================================================================
-- DESCRIPTION: Displays blocking locks summmary   
--
--=============================================================================
-- MODIFICATION HISTORY
-- Person      Date       Comments
-- ---------   ---------- --------------------------------------------
-- Chet West   08/08/2002 Initial Creation;; 
--=============================================================================
SELECT   /*+ CHOOSE */
         bs.username "Blocking User"
        ,bs.username "DB User"
        ,ws.username "Waiting User"
        ,bs.sid "SID"
        ,ws.sid "WSID"
        ,bs.sql_address "address"
        ,bs.sql_hash_value "Sql hash"
        ,bs.program "Blocking App"
        ,ws.program "Waiting App"
        ,bs.machine "Blocking Machine"
        ,ws.machine "Waiting Machine"
        ,bs.osuser "Blocking OS User"
        ,ws.osuser "Waiting OS User"
        ,bs.serial# "Serial#"
        ,DECODE (
            wk.TYPE
           ,'MR', 'Media Recovery'
           ,'RT', 'Redo Thread'
           ,'UN', 'USER Name'
           ,'TX', 'Transaction'
           ,'TM', 'DML'
           ,'UL', 'PL/SQL USER LOCK'
           ,'DX', 'Distributed Xaction'
           ,'CF', 'Control FILE'
           ,'IS', 'Instance State'
           ,'FS', 'FILE SET'
           ,'IR', 'Instance Recovery'
           ,'ST', 'Disk SPACE Transaction'
           ,'TS', 'Temp Segment'
           ,'IV', 'Library Cache Invalidation'
           ,'LS', 'LOG START OR Switch'
           ,'RW', 'ROW Wait'
           ,'SQ', 'Sequence Number'
           ,'TE', 'Extend TABLE'
           ,'TT', 'Temp TABLE'
           ,wk.TYPE
         ) lock_type
        ,DECODE (
            hk.lmode
           ,0, 'None'
           ,1, 'NULL'
           ,2, 'ROW-S (SS)'
           ,3, 'ROW-X (SX)'
           ,4, 'SHARE'
           ,5, 'S/ROW-X (SSX)'
           ,6, 'EXCLUSIVE'
           ,TO_CHAR (hk.lmode)
         ) mode_held
        ,DECODE (
            wk.request
           ,0, 'None'
           ,1, 'NULL'
           ,2, 'ROW-S (SS)'
           ,3, 'ROW-X (SX)'
           ,4, 'SHARE'
           ,5, 'S/ROW-X (SSX)'
           ,6, 'EXCLUSIVE'
           ,TO_CHAR (wk.request)
         ) mode_requested
        ,TO_CHAR (hk.id1) lock_id1
        ,TO_CHAR (hk.id2) lock_id2
    FROM v$lock hk
        ,v$session bs
        ,v$lock wk
        ,v$session ws
   WHERE hk.BLOCK = 1
     AND hk.lmode != 0
     AND hk.lmode != 1
     AND wk.request != 0
     AND wk.TYPE(+) = hk.TYPE
     AND wk.id1(+) = hk.id1
     AND wk.id2(+) = hk.id2
     AND hk.sid = bs.sid(+)
     AND wk.sid = ws.sid(+)
ORDER BY 1