Help in interpreting the output of explain plan

Question

Hi,
I have written a query in two different ways and then run an explain plan on both of them. Both these queries give same result. I want to know which one will be more efficient. I am giving the output of explain plan for both the queries:
The second plan has a lower cost but has much higher consistent gets !!
Please advise.
Plan 1:
Execution Plan
   0      SELECT STATEMENT Optimizer=HINT: FIRST_ROWS (Cost=8637 Card= 1 Bytes=10132)
   1    0   SORT (ORDER BY) (Cost=8637 Card=1 Bytes=10132)
   2    1     WINDOW (SORT) (Cost=8637 Card=1 Bytes=10132)
   3    2       COUNT (STOPKEY)
   4    3         VIEW (Cost=8635 Card=1 Bytes=10132)
   5    4           SORT (ORDER BY) (Cost=8635 Card=1 Bytes=862)
   6    5             WINDOW (SORT) (Cost=8635 Card=1 Bytes=862)
   7    6               MAT_VIEW ACCESS (FULL) OF 'PRD_SEARCH_MVW' (MAT_VIEW) (Cost=8633 Card=1 Bytes=862)
Statistics
        577  recursive calls
          0  db block gets
      39202  consistent gets
      34798  physical reads
          0  redo size
      72348  bytes sent via SQL*Net to client
       4295  bytes received via SQL*Net from client
          9  SQL*Net roundtrips to/from client
         10  sorts (memory)
          0  sorts (disk)
        100  rows processed
Plan-2
Execution Plan
   0      SELECT STATEMENT Optimizer=HINT: FIRST_ROWS (Cost=982 Card=1 Bytes=10145)
   1    0   SORT (ORDER BY) (Cost=982 Card=1 Bytes=10145)
   2    1     WINDOW (SORT) (Cost=982 Card=1 Bytes=10145)
   3    2       COUNT (STOPKEY)
   4    3         VIEW (Cost=980 Card=1 Bytes=10145)
   5    4           SORT (ORDER BY) (Cost=980 Card=1 Bytes=10132)
   6    5             WINDOW (SORT) (Cost=980 Card=1 Bytes=10132)
   7    6               WINDOW (SORT) (Cost=980 Card=1 Bytes=10132)
   8    7                 VIEW (Cost=977 Card=1 Bytes=10132)
   9    8                   WINDOW (SORT PUSHED RANK) (Cost=977 Card=1 Bytes=889)
  10    9                     NESTED LOOPS (Cost=976 Card=1 Bytes=889)
  11   10                       HASH JOIN (Cost=305 Card=670 Bytes=18090)
  12   11                         HASH JOIN (Cost=23 Card=140 Bytes=2240)
  13   12                           INDEX (FAST FULL SCAN) OF 'GLCAT_GRP_TO_CAT_PK' (INDEX (UNIQUE)) (Cost=2 Card=52 Bytes=364)
  14   12                           MAT_VIEW ACCESS (FULL) OF 'GLCAT_CAT_TO_MCAT' (MAT_VIEW) (Cost=20 Card=1039 Bytes=9351)
  15   11                         INDEX (FAST FULL SCAN) OF 'PCITEM2GLCATMCAT_FK_IDS' (INDEX) (Cost=281 Card=16903 Bytes=185933)
  16   10                       MAT_VIEW ACCESS (BY INDEX ROWID) OF 'PRD_SEARCH_MVW' (MAT_VIEW) (Cost=1 Card=1 Bytes=862)
  17   16                         INDEX (UNIQUE SCAN) OF 'PK_PRD_SEARCH_ID' (INDEX (UNIQUE)) (Cost=0 Card=1)
Statistics
        481    recursive calls
          2      db block gets
     195742  consistent gets
       7516  physical reads
          0  redo size
      71567  bytes sent via SQL*Net to client
       6629  bytes received via SQL*Net from client
          9  SQL*Net roundtrips to/from client
         15  sorts (memory)
          1  sorts (disk)
        100  rows processedRegards
Madhup
Message was edited by:
Madhup

Answer 1

Thanks a lot for you input. I am posting both the queries below. My requirements are following:
1) I have a products table
2) I have Created grouping hierarchy - Groups, Categories and then Micro-categories - and have setup a separate table for each of them in my database
3) Then I have mapping tables, i.e. a table that stores group to category mapping, another table that stores category to micro-category mapping.
4) Products are mapped directly to micro-categories and one product could be mapped to multiple micro-categories.
5) I have created a materialized view on product and store the mappings as comma separated list of IDs - I have three fields there, on to store comma separated group id, second to store comma separated category ids and third to store the comma separated micro category ids to which the product is mapped.
Now I want to write a query that will return a specified number of matches from this table based on user defined criterion. There are few other filter cirterion apart from Group/Category and Microcategory. These are Company Name, Country, Type of company etc.
This query when run on production will be accessed very frequently - I expect the access to be in the tune of around 5-10 times per second.
There are 50 records in the group table
There are 500 categories
There are 20000 micro-categories
Group to category mapping table has around 1000 records
Category to microcategory table has around 25000 records
The product table has around 100,000 products.
Product to microcategory mapping table has 350000 records
The product mview has the same number of records as that in products table.
The first query uses the single materialized view to access data, however, it always does a full table scan and does not use any index.
When I noticed this in the explain plan, then I tried to write the second query which is using JOINs to arrive at the same output.
The explain plan now says that it is using Index scans.
I did a sample run of both the queries on my production system and I had to withdraw both of them as both brought my system to grinding halt within few minutes of going live.
My system at present receives around 3000 requests per hour during peak load and around 600 requests per hour during off-peak hours.
And I was testing these queries in Off-peak hours !!
Here are the two sql queries just for reference - there are several variables plugged in where clause which are the key drivers of the query:
SQL-1
SELECT DECODE(:OPT,2,A.SC,(MAX(A.SC) OVER (PARTITION BY A.PRD_SEARCH_COMPANY))) AS SO,
     A.SC,                           A.PRD_SEARCH_ID,
     A.PRD_SEARCH_COMPANY_ID,        A.PRD_SEARCH_COMPANY,            A.PRD_SEARCH_COMPANYID_ENCRYPTED,
     A.PRD_SEARCH_PCID,              A.PRD_SEARCH_URL,                A.PRD_SEARCH_PC_CLNT_HOME,
     A.PRD_SEARCH_CLNT_ENABLED,      A.PRD_SEARCH_CODE,               A.PRD_SEARCH_NAME,
     A.PRD_SEARCH_DESC_SMALL,        A.PRD_SEARCH_DESC_DETAILED,      A.PRD_SEARCH_DESC_HTML,
     A.PRD_SEARCH_IMG_SMALL,         A.PRD_SEARCH_IMG_LARGE,          A.PRD_SEARCH_WEIGHT_ITEM,
     A.PRD_SEARCH_MODIFIEDDATE,      A.PRD_SEARCH_SIZE,               A.PRD_SEARCH_LABEL1,
     A.PRD_SEARCH_LABEL1_VALUE,      A.PRD_SEARCH_LABEL2,             A.PRD_SEARCH_LABEL2_VALUE,
     A.PRD_SEARCH_LABEL3,            A.PRD_SEARCH_LABEL3_VALUE,       A.PRD_SEARCH_LABEL4,
     A.PRD_SEARCH_LABEL4_VALUE,      A.PRD_SEARCH_LABEL5,             A.PRD_SEARCH_LABEL5_VALUE,
     A.PRD_SEARCH_LABEL6,            A.PRD_SEARCH_LABEL6_VALUE,       A.PRD_SEARCH_CAT_ID,
     A.PRD_SEARCH_CAT_NAME,          A.PRD_SEARCH_CAT_FLNAME,         A.PRD_SEARCH_NAVIGATION_TREE,
     A.PRD_SEARCH_NAVIGATION_TREE_ID,A.PRD_SEARCH_CITY,               A.PRD_SEARCH_STATE,
     A.PRD_SEARCH_COUNTRY,           A.PRD_SEARCH_PRICE_SALE,         A.PRD_SEARCH_PC_CLNT_TYPE,
     A.PRD_SEARCH_PC_CLNT_TYPE_DESC,
     A.PRD_SEARCH_COMPANY_PHONE,     A.PRD_SEARCH_COMPANY_MOBILE,     A.PRD_SEARCH_COMPANY_FAX,
     A.PRD_SEARCH_COMPANY_EMAIL,     A.PRD_SEARCH_GLCAT_MCAT_ID_LIST, A.PRD_SEARCH_GLCAT_CAT_ID_LIST,
     A.PRD_SEARCH_GLCAT_GRP_ID_LIST, A.PRD_SEARCH_GL_COUNTRY_ISO,     A.PRD_SEARCH_GLUSR_USR_ID,
     A.PRD_SEARCH_TRUSTSEAL_CODE,    A.PRD_SEARCH_CUSTTYPE_ID,        A.PRD_SEARCH_CUSTTYPE_NAME,
     A.PRD_SEARCH_CUSTTYPE_WEIGHT,   A.PRD_SEARCH_CUSTTYPE_WEIGHT_TZ, A.PRD_SEARCH_CUSTTYPE_RANK,
     A.PRD_SEARCH_PC_ITEM_HOTNEW,    A.RK
     FROM
          (SELECT  /*+ FIRST_ROWS (500) */     DECODE(:S_MODE,2,1,3,to_number(to_char(PRD_SEARCH_MODIFIEDDATE,'yyyymmdd')),1) AS SC,
          PRD_SEARCH_ID,
          PRD_SEARCH_COMPANY_ID,        PRD_SEARCH_COMPANY,            PRD_SEARCH_COMPANYID_ENCRYPTED,
          PRD_SEARCH_PCID,              PRD_SEARCH_URL,                PRD_SEARCH_PC_CLNT_HOME,
          PRD_SEARCH_CLNT_ENABLED,      PRD_SEARCH_CODE,               PRD_SEARCH_NAME,
          PRD_SEARCH_DESC_SMALL,        PRD_SEARCH_DESC_DETAILED,      PRD_SEARCH_DESC_HTML,
          PRD_SEARCH_IMG_SMALL,         PRD_SEARCH_IMG_LARGE,          PRD_SEARCH_WEIGHT_ITEM,
          PRD_SEARCH_MODIFIEDDATE,      PRD_SEARCH_SIZE,               PRD_SEARCH_LABEL1,
          PRD_SEARCH_LABEL1_VALUE,      PRD_SEARCH_LABEL2,             PRD_SEARCH_LABEL2_VALUE,
          PRD_SEARCH_LABEL3,            PRD_SEARCH_LABEL3_VALUE,       PRD_SEARCH_LABEL4,
          PRD_SEARCH_LABEL4_VALUE,      PRD_SEARCH_LABEL5,             PRD_SEARCH_LABEL5_VALUE,
          PRD_SEARCH_LABEL6,            PRD_SEARCH_LABEL6_VALUE,       PRD_SEARCH_CAT_ID,
          PRD_SEARCH_CAT_NAME,          PRD_SEARCH_CAT_FLNAME,         PRD_SEARCH_NAVIGATION_TREE,
          PRD_SEARCH_NAVIGATION_TREE_ID,PRD_SEARCH_CITY,               PRD_SEARCH_STATE,
          PRD_SEARCH_COUNTRY,           PRD_SEARCH_PRICE_SALE,         PRD_SEARCH_PC_CLNT_TYPE,
          PRD_SEARCH_PC_CLNT_TYPE_DESC,
          PRD_SEARCH_COMPANY_PHONE,     PRD_SEARCH_COMPANY_MOBILE,     PRD_SEARCH_COMPANY_FAX,
          PRD_SEARCH_COMPANY_EMAIL,     PRD_SEARCH_GLCAT_MCAT_ID_LIST, PRD_SEARCH_GLCAT_CAT_ID_LIST,
          PRD_SEARCH_GLCAT_GRP_ID_LIST, PRD_SEARCH_GL_COUNTRY_ISO,     PRD_SEARCH_GLUSR_USR_ID,
          PRD_SEARCH_TRUSTSEAL_CODE,    PRD_SEARCH_CUSTTYPE_ID,        PRD_SEARCH_CUSTTYPE_NAME,
          PRD_SEARCH_CUSTTYPE_WEIGHT,   PRD_SEARCH_CUSTTYPE_WEIGHT_TZ, PRD_SEARCH_CUSTTYPE_RANK,
          PRD_SEARCH_PC_ITEM_HOTNEW,
          ROW_NUMBER() OVER (PARTITION BY PRD_SEARCH_COMPANY_ID
                              ORDER BY DECODE(:S_MODE,2,1,3,to_number(to_char(PRD_SEARCH_MODIFIEDDATE,'yyyymmdd')),1) DESC) AS RK
          FROM      PRD_SEARCH
          WHERE     DECODE(:GRP_ID_STR,NULL,1,REGEXP_INSTR(','||REPLACE(PRD_SEARCH_GLCAT_GRP_ID_LIST,' ','')||',',:MYGRP_ID_STR)) > 0
          AND       DECODE(:CAT_ID_STR,NULL,1,REGEXP_INSTR(','||REPLACE(PRD_SEARCH_GLCAT_CAT_ID_LIST,' ','')||',',:MYCAT_ID_STR)) > 0
          AND       DECODE(:MCAT_ID_STR,NULL,1,REGEXP_INSTR(','||REPLACE(PRD_SEARCH_GLCAT_MCAT_ID_LIST,' ','')||',',:MYMCAT_ID_STR)) > 0
          AND       DECODE(:ITEM_ID_STR,NULL,1,REGEXP_INSTR(','||PRD_SEARCH_ID||',',:MYITEM_ID_STR)) > 0
          AND       DECODE(:COUNTRY_ISO,NULL,1,REGEXP_INSTR(','||PRD_SEARCH_GL_COUNTRY_ISO||',',:COUNTRY_ISO)) > 0
          AND       DECODE(nvl(NULL,0),0,1,PRD_SEARCH_COMPANY_ID) = DECODE(nvl(NULL,0),0,1,NULL)
          AND       DECODE(nvl(NULL,0),0,1,PRD_SEARCH_GLUSR_USR_ID) = DECODE(nvl(NULL,0),0,1,NULL)
          AND       PRD_SEARCH_CLNT_ENABLED >= nvl(:LIST_TYPE,0)
          AND       NVL(Length(PRD_SEARCH_TRUSTSEAL_CODE),0) >= :TSONLY
          ORDER BY SC DESC, PRD_SEARCH_CUSTTYPE_WEIGHT ASC, DBMS_RANDOM.RANDOM
          )  A
WHERE A.RK <= :MY_PRD_PER_COMP
AND   ROWNUM <= :MYMAXREC
ORDER BY SO DESC, DECODE(:OPT,2,'1',A.PRD_SEARCH_COMPANY), A.RK ASC, DBMS_RANDOM.RANDOM
SQL-2
     SELECT
          DECODE(:OPT,2,SC,(MAX(SC) OVER (PARTITION BY PRD_SEARCH_COMPANY))) AS SO,
          SC,                           PRD_SEARCH_ID,
          PRD_SEARCH_COMPANY_ID,        PRD_SEARCH_COMPANY,            PRD_SEARCH_COMPANYID_ENCRYPTED,
          PRD_SEARCH_PCID,              PRD_SEARCH_URL,                PRD_SEARCH_PC_CLNT_HOME,
          PRD_SEARCH_CLNT_ENABLED,      PRD_SEARCH_CODE,               PRD_SEARCH_NAME,
          PRD_SEARCH_DESC_SMALL,        PRD_SEARCH_DESC_DETAILED,      PRD_SEARCH_DESC_HTML,
          PRD_SEARCH_IMG_SMALL,         PRD_SEARCH_IMG_LARGE,          PRD_SEARCH_WEIGHT_ITEM,
          PRD_SEARCH_MODIFIEDDATE,      PRD_SEARCH_SIZE,               PRD_SEARCH_LABEL1,
          PRD_SEARCH_LABEL1_VALUE,      PRD_SEARCH_LABEL2,             PRD_SEARCH_LABEL2_VALUE,
          PRD_SEARCH_LABEL3,            PRD_SEARCH_LABEL3_VALUE,       PRD_SEARCH_LABEL4,
          PRD_SEARCH_LABEL4_VALUE,      PRD_SEARCH_LABEL5,             PRD_SEARCH_LABEL5_VALUE,
          PRD_SEARCH_LABEL6,            PRD_SEARCH_LABEL6_VALUE,       PRD_SEARCH_CAT_ID,
          PRD_SEARCH_CAT_NAME,          PRD_SEARCH_CAT_FLNAME,         PRD_SEARCH_NAVIGATION_TREE,
          PRD_SEARCH_NAVIGATION_TREE_ID,PRD_SEARCH_CITY,               PRD_SEARCH_STATE,
          PRD_SEARCH_COUNTRY,           PRD_SEARCH_PRICE_SALE,         PRD_SEARCH_PC_CLNT_TYPE,
          PRD_SEARCH_PC_CLNT_TYPE_DESC,
          PRD_SEARCH_COMPANY_PHONE,     PRD_SEARCH_COMPANY_MOBILE,     PRD_SEARCH_COMPANY_FAX,
          PRD_SEARCH_COMPANY_EMAIL,     PRD_SEARCH_GLCAT_MCAT_ID_LIST, PRD_SEARCH_GLCAT_CAT_ID_LIST,
          PRD_SEARCH_GLCAT_GRP_ID_LIST, PRD_SEARCH_GL_COUNTRY_ISO,     PRD_SEARCH_GLUSR_USR_ID,
          PRD_SEARCH_TRUSTSEAL_CODE,    PRD_SEARCH_CUSTTYPE_ID,        PRD_SEARCH_CUSTTYPE_NAME,
          PRD_SEARCH_CUSTTYPE_WEIGHT,   PRD_SEARCH_CUSTTYPE_WEIGHT_TZ, PRD_SEARCH_CUSTTYPE_RANK,
          PRD_SEARCH_PC_ITEM_HOTNEW,    RK
     FROM
               SELECT
                    /*+ FIRST_ROWS (500) */ DECODE(:OPT,2,SC,(MAX(SC) OVER (PARTITION BY PRD_SEARCH_COMPANY))) AS SO,
                    SC,PRD_SEARCH_ID,
                    PRD_SEARCH_COMPANY_ID,        PRD_SEARCH_COMPANY,            PRD_SEARCH_COMPANYID_ENCRYPTED,
                    PRD_SEARCH_PCID,              PRD_SEARCH_URL,                PRD_SEARCH_PC_CLNT_HOME,
                    PRD_SEARCH_CLNT_ENABLED,      PRD_SEARCH_CODE,               PRD_SEARCH_NAME,
                    PRD_SEARCH_DESC_SMALL,        PRD_SEARCH_DESC_DETAILED,      PRD_SEARCH_DESC_HTML,
                    PRD_SEARCH_IMG_SMALL,         PRD_SEARCH_IMG_LARGE,          PRD_SEARCH_WEIGHT_ITEM,
                    PRD_SEARCH_MODIFIEDDATE,      PRD_SEARCH_SIZE,               PRD_SEARCH_LABEL1,
                    PRD_SEARCH_LABEL1_VALUE,      PRD_SEARCH_LABEL2,             PRD_SEARCH_LABEL2_VALUE,
                    PRD_SEARCH_LABEL3,            PRD_SEARCH_LABEL3_VALUE,       PRD_SEARCH_LABEL4,
                    PRD_SEARCH_LABEL4_VALUE,      PRD_SEARCH_LABEL5,             PRD_SEARCH_LABEL5_VALUE,
                    PRD_SEARCH_LABEL6,            PRD_SEARCH_LABEL6_VALUE,       PRD_SEARCH_CAT_ID,
                    PRD_SEARCH_CAT_NAME,          PRD_SEARCH_CAT_FLNAME,         PRD_SEARCH_NAVIGATION_TREE,
                    PRD_SEARCH_NAVIGATION_TREE_ID,PRD_SEARCH_CITY,               PRD_SEARCH_STATE,
                    PRD_SEARCH_COUNTRY,           PRD_SEARCH_PRICE_SALE,         PRD_SEARCH_PC_CLNT_TYPE,
                    PRD_SEARCH_PC_CLNT_TYPE_DESC,
                    PRD_SEARCH_COMPANY_PHONE,     PRD_SEARCH_COMPANY_MOBILE,     PRD_SEARCH_COMPANY_FAX,
                    PRD_SEARCH_COMPANY_EMAIL,     PRD_SEARCH_GLCAT_MCAT_ID_LIST, PRD_SEARCH_GLCAT_CAT_ID_LIST,
                    PRD_SEARCH_GLCAT_GRP_ID_LIST, PRD_SEARCH_GL_COUNTRY_ISO,     PRD_SEARCH_GLUSR_USR_ID,
                    PRD_SEARCH_TRUSTSEAL_CODE,    PRD_SEARCH_CUSTTYPE_ID,        PRD_SEARCH_CUSTTYPE_NAME,
                    PRD_SEARCH_CUSTTYPE_WEIGHT,   PRD_SEARCH_CUSTTYPE_WEIGHT_TZ, PRD_SEARCH_CUSTTYPE_RANK,
                    PRD_SEARCH_PC_ITEM_HOTNEW,
                    ROW_NUMBER() OVER (PARTITION BY PRD_SEARCH_COMPANY_ID
                              ORDER BY DECODE(:S_MODE,2,1,3,TO_NUMBER(TO_CHAR(PRD_SEARCH_MODIFIEDDATE,'YYYYMMDD')),1) DESC) AS RK
               FROM
                         SELECT
                              DECODE(:S_MODE,2,1,3,TO_NUMBER(TO_CHAR(PRD_SEARCH_MODIFIEDDATE,'YYYYMMDD')),1) AS SC,
                              PRD_SEARCH_ID,
                              PRD_SEARCH_COMPANY_ID,        PRD_SEARCH_COMPANY,            PRD_SEARCH_COMPANYID_ENCRYPTED,
                              PRD_SEARCH_PCID,              PRD_SEARCH_URL,                PRD_SEARCH_PC_CLNT_HOME,
                              PRD_SEARCH_CLNT_ENABLED,      PRD_SEARCH_CODE,               PRD_SEARCH_NAME,
                              PRD_SEARCH_DESC_SMALL,        PRD_SEARCH_DESC_DETAILED,      PRD_SEARCH_DESC_HTML,
                              PRD_SEARCH_IMG_SMALL,         PRD_SEARCH_IMG_LARGE,          PRD_SEARCH_WEIGHT_ITEM,
                              PRD_SEARCH_MODIFIEDDATE,      PRD_SEARCH_SIZE,               PRD_SEARCH_LABEL1,
                              PRD_SEARCH_LABEL1_VALUE,      PRD_SEARCH_LABEL2,             PRD_SEARCH_LABEL2_VALUE,
                              PRD_SEARCH_LABEL3,            PRD_SEARCH_LABEL3_VALUE,       PRD_SEARCH_LABEL4,
                              PRD_SEARCH_LABEL4_VALUE,      PRD_SEARCH_LABEL5,             PRD_SEARCH_LABEL5_VALUE,
                              PRD_SEARCH_LABEL6,            PRD_SEARCH_LABEL6_VALUE,       PRD_SEARCH_CAT_ID,
                              PRD_SEARCH_CAT_NAME,          PRD_SEARCH_CAT_FLNAME,         PRD_SEARCH_NAVIGATION_TREE,
                              PRD_SEARCH_NAVIGATION_TREE_ID,PRD_SEARCH_CITY,               PRD_SEARCH_STATE,
                              PRD_SEARCH_COUNTRY,           PRD_SEARCH_PRICE_SALE,         PRD_SEARCH_PC_CLNT_TYPE,
                              PRD_SEARCH_PC_CLNT_TYPE_DESC,
                              PRD_SEARCH_COMPANY_PHONE,     PRD_SEARCH_COMPANY_MOBILE,     PRD_SEARCH_COMPANY_FAX,
                              PRD_SEARCH_COMPANY_EMAIL,     PRD_SEARCH_GLCAT_MCAT_ID_LIST, PRD_SEARCH_GLCAT_CAT_ID_LIST,
                              PRD_SEARCH_GLCAT_GRP_ID_LIST, PRD_SEARCH_GL_COUNTRY_ISO,     PRD_SEARCH_GLUSR_USR_ID,
                              PRD_SEARCH_TRUSTSEAL_CODE,    PRD_SEARCH_CUSTTYPE_ID,        PRD_SEARCH_CUSTTYPE_NAME,
                              PRD_SEARCH_CUSTTYPE_WEIGHT,   PRD_SEARCH_CUSTTYPE_WEIGHT_TZ, PRD_SEARCH_CUSTTYPE_RANK,
                              PRD_SEARCH_PC_ITEM_HOTNEW,
                              ROW_NUMBER() OVER (PARTITION BY P.PRD_SEARCH_ID ORDER BY P.PRD_SEARCH_ID) RK1
                         FROM
                              GLCAT_GRP_TO_CAT G2C, GLCAT_CAT_TO_MCAT C2M, PC_ITEM_TO_GLCAT_MCAT M, PRD_SEARCH P
                         WHERE
                              G2C.FK_GLCAT_CAT_ID = C2M.FK_GLCAT_CAT_ID
                              AND C2M.FK_GLCAT_MCAT_ID = M.FK_GLCAT_MCAT_ID
                              AND M.FK_PC_ITEM_ID = P.PRD_SEARCH_ID
                              AND DECODE(:MCAT_ID_STR, NULL, 1, INSTR(','||:MCAT_ID_STR||',',','||M.FK_GLCAT_MCAT_ID||',',1))> 0
                              AND DECODE(:CAT_ID_STR, NULL, 1, INSTR(','||:CAT_ID_STR||',',','||C2M.FK_GLCAT_CAT_ID||',',1)) > 0
                              AND DECODE(:GRP_ID_STR, NULL, 1, INSTR(','||:GRP_ID_STR||',',','||G2C.FK_GLCAT_GRP_ID||',',1)) > 0
                              AND DECODE(:ITEM_ID_STR,NULL,1,INSTR(','||:ITEM_ID_STR||',' , ','||P.PRD_SEARCH_ID||',')) > 0
                              AND DECODE(:COUNTRY_ISO,NULL,1,INSTR(','||:COUNTRY_ISO||',', ','||P.PRD_SEARCH_GL_COUNTRY_ISO||',')) > 0
                              AND DECODE(NVL(:COMPANY_ID,0),0,1,P.PRD_SEARCH_COMPANY_ID) = DECODE(NVL(:COMPANY_ID,0),0,1,:COMPANY_ID)
                              AND DECODE(NVL(:GLUSR_ID,0),0,1,P.PRD_SEARCH_GLUSR_USR_ID) = DECODE(NVL(:GLUSR_ID,0),0,1,:GLUSR_ID)
                              AND P.PRD_SEARCH_CLNT_ENABLED >= NVL(:LIST_TYPE,0)
                              AND NVL(LENGTH(P.PRD_SEARCH_TRUSTSEAL_CODE),0) >= :TSONLY
               WHERE RK1=1
               ORDER BY SC DESC, PRD_SEARCH_CUSTTYPE_WEIGHT ASC, DBMS_RANDOM.RANDOM
          ) A
     WHERE A.RK <= :MY_PRD_PER_COMP
     AND   ROWNUM <= :MYMAXREC
     ORDER BY A.SO DESC, DECODE(:OPT,2,'1', A.PRD_SEARCH_COMPANY), A.RK ASC, DBMS_RANDOM.RANDOMRegards
Madhup