Problem with outer jon

Question

Hi,
some performance issue with the query. in the below query is forming px_from and px_to and finally joins together. If i execute the query seperatly
both px_from and px_to comes very fast (within 20 secs). But when finally joining
between px_from and px_to is taking more than 10 mnts
the total records from px_from and px_to returns around 20,000. Can someone help
me to find out which is best way we can perform these joins?
  SELECT /*+ NO_MERGE(PX_FROM PX_TO) USE_NL(PX_FROM PX_TO)*/
    PX_FROM.PRICING_SECURITY_ID,
       PX_to.PRICING_SECURITY_ID
       FROM(
   SELECT /*+ FULL(XREF) */
      NVL(xref.SECURITY_ALIAS, 1)SECURITY_ALIAS,
      GP.PRICING_SECURITY_ID,
      GP.SECURITY_TRANSLATION_CODE GPS_STC,
      GP.SOURCE_SECURITY_KEY_VALUE GPS_STV,
      GP.PX_DATE Px1Dt,
      GP.PX_TYPE,
      DECODE(GP.PX_SOURCE, 'GISOPS', GP.PX_OVR_SOURCE, GP.PX_SOURCE) PX1_SOURCE
      GP.PX_ISO_CCY,
      GP.GPS_LEVEL FAS_LEVEL1,
      GP.PRICE,
      GP.CREATE_TIMESTAMP Px1CTS,
      GP.CREATE_USERID Px1CUID
   FROM (
      SELECT Y.PRICING_sECURITY_ID,
         Y.SECURITY_TRANSLATION_CODE,
         Y.SOURCE_SECURITY_KEY_VALUE,
         Y.PX_DATE,
         Y.PX_TYPE,
         Y.PX_SOURCE,
         Y.PX_OVR_SOURCE,
         Y.PX_ISO_CCY,
         Y.GPS_LEVEL,
         Y.PRICE,
         Y.CREATE_TIMESTAMP,
         Y.CREATE_USERID
      FROM (
         SELECT MAX(GP.PX_DATE) PX_DATE,
            GP.PRICING_SECURITY_ID,
            GP.PX_ISO_CCY
         FROM GPS.GIS_PRICING GP, GPS.WK_GPS_FE_REPORTS_NEW GTT
         WHERE GP.CREATE_TIMESTAMP BETWEEN TO_DATE('09/28/2007 12:00:00 AM',
         'MM/DD/YYYY HH:MI:SS AM')
         AND TO_DATE('09/29/2007 12:00:00 AM', 'MM/DD/YYYY HH:MI:SS AM')
         AND GP.PX_TYPE = 'PS1'
         AND GP.PX_ACTIVE = 'A'
         AND GP.PX_DATE = GTT.PX_DATE
         AND GP.PRICING_SECURITY_ID = GTT.PRICING_SECURITY_ID
         GROUP BY GP.PRICING_SECURITY_ID, GP.PX_ISO_CCY )X, (
         SELECT GP.*
         FROM GPS.GIS_PRICING GP
         WHERE GP.CREATE_TIMESTAMP BETWEEN TO_DATE('09/28/2007 12:00:00 AM',
         'MM/DD/YYYY HH:MI:SS AM')
         AND TO_DATE('09/29/2007 12:00:00 AM', 'MM/DD/YYYY HH:MI:SS AM')
         AND GP.PX_TYPE = 'PS1'
         AND GP.PX_ACTIVE = 'A') Y
      WHERE X.PRICING_SECURITY_ID = Y.PRICING_SECURITY_ID
      AND X.PX_ISO_CCY = Y.PX_ISO_CCY
      AND X.PX_DATE = Y.PX_DATE ) GP, GPS.pricing_security ps, gps.pricing_security_translation
      pst, securitydbo.xreference xref
   WHERE GP.pricing_security_id = ps.pricing_security_id(+)
   AND ps.pricing_security_id = pst.pricing_security_id(+)
   AND gp.px_iso_ccy = ps.iso_ccy(+)
   AND pst.source_type (+) = 'NYCPAM'
   AND pst.security_translation_code(+) = 'NYCPAM'
   AND TRIM(pst.translation_value) = TRIM(xref.xref_security_id(+))
   AND xref.xref_type(+) = 'INYCPAM' )PX_FROM, (
   SELECT Y.PRICING_SECURITY_ID,
      Y.PX_DATE Px2Dt,
      Y.PX_TYPE,
      DECODE(Y.PX_SOURCE, 'GISOPS', Y.PX_OVR_SOURCE, Y.PX_SOURCE) PX2_SOURCE,
      Y.PX_ISO_CCY,
      Y.GPS_LEVEL FAS_LEVEL2,
      Y.PRICE,
      Y.CREATE_TIMESTAMP Px2CTS,
      Y.CREATE_USERID Px2CUID,
      Y.PX_ACTIVE
   FROM (
      SELECT MAX(GP.PX_DATE) PX_DATE,
         GP.PRICING_SECURITY_ID,
         GP.PX_ISO_CCY,
         GP.PX_TYPE,
         GP.PX_ACTIVE
      FROM GPS.GIS_PRICING GP, GPS.WK_GPS_FE_REPORTS_NEW GTT
      WHERE   GTT.PRICING_SECURITY_ID = GP.PRICING_SECURITY_ID 
      AND GP.PX_TYPE = 'PS1'
      AND GP.PX_ACTIVE = 'A'
      --               AND EXISTS (SELECT 'Y' FROM GPS.WK_GPS_FE_REPORTS_NEW GTT
      --                           WHERE GTT.PRICING_SECURITY_ID = GP.PRICING_SECURITY_ID
      --                           AND GTT.PX_DATE != GP.PX_DATE)
      AND GP.PX_DATE < GTT.PX_DATE
      GROUP BY GP.PRICING_SECURITY_ID, GP.PX_ISO_CCY, GP.PX_TYPE, GP.PX_ACTIVE
      )X, (
      SELECT GP.*
      FROM GPS.GIS_PRICING GP
       WHERE GP.PX_TYPE = 'PS1'
       AND GP.PX_ACTIVE = 'A'
      ) Y
   WHERE  X.PRICING_SECURITY_ID = Y.PRICING_SECURITY_ID
    AND  X.PX_DATE = Y.PX_DATE
    AND X.PX_ISO_CCY = Y.PX_ISO_CCY )PX_TO
         WHERE PX_FROM.PRICING_SECURITY_ID = PX_TO.PRICING_SECURITY_ID (+)
           AND PX_FROM.PX_ISO_CCY = PX_TO.PX_ISO_CCY (+)

Answer 1

Lots of them. But to start:
1. Post the Oracle version
2. Strip the hints
3. Post the Explain plan