who_dblink.sql

db links: who_dblink.sql

--The following script can be used to see open DB link sessions (on both databases).
-- who is querying via dblink?
-- Courtesy of Tom Kyte, via Mark Bobak
-- this script can be used at both ends of the database link
-- to match up which session on the remote database started
-- the local transaction
-- the GTXID will match for those sessions
-- just run the script on both databases

Select /*+ ORDERED */
substr(s.ksusemnm,1,10)||'-'|| substr(s.ksusepid,1,10)      "ORIGIN",
substr(g.K2GTITID_ORA,1,35) "GTXID",
substr(s.indx,1,4)||'.'|| substr(s.ksuseser,1,5) "LSESSION" ,
s2.username,
substr(
   decode(bitand(ksuseidl,11),
      1,'ACTIVE',
      0, decode( bitand(ksuseflg,4096) , 0,'INACTIVE','CACHED'),
      2,'SNIPED',
      3,'SNIPED',
      'KILLED'
   ),1,1
) "S",
substr(w.event,1,10) "WAITING"
from  x$k2gte g, x$ktcxb t, x$ksuse s, v$session_wait w, v$session s2
where  g.K2GTDXCB =t.ktcxbxba
and   g.K2GTDSES=t.ktcxbses
and  s.addr=g.K2GTDSES
and  w.sid=s.indx
and s2.sid = w.sid;


--Get DDLs of all db links
Set long 1000
set pages 500
set lines 200
SELECT DBMS_METADATA.GET_DDL('DB_LINK',db.db_link,db.owner) from dba_db_links db;

--DB links information
SET LINES 200
SET PAGES 500
COL OWNER FORMAT a15
COL USERNAME FORMAT A25 HEADING "USER"
COL DB_LINK FORMAT A50
COL HOST FORMAT A50 HEADING "SERVICE"
SELECT * FROM DBA_DB_LINKS
/