Peformance of a Materialized view
Hi,
I have created materialized view the below
CREATE MATERIALIZED VIEW SUMMARY.V_OSFI_FEED_CORE_DATA_ADJ
TABLESPACE RCDW_CAD_SUM_1M_DAT01
PCTUSED 0
PCTFREE 0
INITRANS 2
MAXTRANS 255
STORAGE (
INITIAL 64K
MINEXTENTS 1
MAXEXTENTS UNLIMITED
PCTINCREASE 0
BUFFER_POOL DEFAULT
NOCACHE
LOGGING
NOCOMPRESS
NOPARALLEL
BUILD DEFERRED
REFRESH FORCE ON DEMAND
WITH PRIMARY KEY
AS
/* Formatted on 2010/01/27 14:49 (Formatter Plus v4.8.8) */
SELECT orgn.month_end_date month_end_date,
orgn.ntrl_k_odc_instrument ntrl_k_odc_instrument,
orgn.processing_system processing_system,
orgn.source_system source_system,
DECODE (UPPER (adjstd.ssb_type_indicator),
'NULL', NULL,
NVL (adjstd.ssb_type_indicator, orgn.ssb_type_indicator)
) ssb_type_indicator,
DECODE (UPPER (adjstd.basel_exposure_class),
'NULL', NULL,
NVL (adjstd.basel_exposure_class, orgn.basel_exposure_class)
) basel_exposure_class,
DECODE (UPPER (adjstd.basel_exposure_subclass),
'NULL', NULL,
NVL (adjstd.basel_exposure_subclass,
orgn.basel_exposure_subclass
) basel_exposure_subclass,
DECODE (UPPER (TRIM (adjstd.ccis_product_code)),
'NULL', NULL,
NVL (adjstd.ccis_product_code, orgn.ccis_product_code)
) ccis_product_code,
orgn.warehouse_instrument_key warehouse_instrument_key,
DECODE (UPPER (adjstd.instrument_status),
'NULL', NULL,
NVL (adjstd.instrument_status, orgn.instrument_status)
) instrument_status,
DECODE (UPPER (adjstd.instrument_open_flag),
'NULL', NULL,
NVL (adjstd.instrument_open_flag, orgn.instrument_open_flag)
) instrument_open_flag,
DECODE (UPPER (adjstd.instrument_dwo_flag),
'NULL', NULL,
NVL (adjstd.instrument_dwo_flag, orgn.instrument_dwo_flag)
) instrument_dwo_flag,
DECODE (UPPER (adjstd.instrument_closed_flag),
'NULL', NULL,
NVL (adjstd.instrument_closed_flag,
orgn.instrument_closed_flag)
) instrument_closed_flag,
DECODE (UPPER (adjstd.instrument_arrears_flag),
'NULL', NULL,
NVL (adjstd.instrument_arrears_flag,
orgn.instrument_arrears_flag
) instrument_arrears_flag,
DECODE (UPPER (adjstd.instrument_npna_flag),
'NULL', NULL,
NVL (adjstd.instrument_npna_flag, orgn.instrument_npna_flag)
) instrument_npna_flag,
DECODE (UPPER (adjstd.account_open_dt),
'NULL', TO_DATE (NULL),
NULL, orgn.account_open_dt,
TO_DATE (adjstd.account_open_dt, 'dd-MON-YYYY')
) account_open_dt,
DECODE (UPPER (adjstd.account_close_dt),
'NULL', TO_DATE (NULL),
NULL, orgn.account_close_dt,
TO_DATE (adjstd.account_close_dt, 'dd-MON-YYYY')
) account_close_dt,
DECODE (UPPER (adjstd.instrument_insured_ind),
'NULL', NULL,
NVL (adjstd.instrument_insured_ind,
orgn.instrument_insured_ind)
) instrument_insured_ind,
DECODE
(UPPER (adjstd.instrument_securitized_ind),
'NULL', NULL,
NVL (adjstd.instrument_securitized_ind,
orgn.instrument_securitized_ind
) instrument_securitized_ind,
DECODE (UPPER (adjstd.country_code),
'NULL', NULL,
NVL (adjstd.country_code, orgn.country_code)
) country_code,
DECODE (UPPER (TRIM (adjstd.province)),
'NULL', NULL,
NVL (adjstd.province, orgn.province)
) province,
COALESCE (adjstd.presec_outstanding_bal,
orgn.presec_outstanding_bal,
NULL
) presec_outstanding_bal,
COALESCE (adjstd.postsec_outstanding_bal,
orgn.postsec_outstanding_bal,
NULL
) postsec_outstanding_bal,
COALESCE (adjstd.presec_authorized_limit,
orgn.presec_authorized_limit,
NULL
) presec_authorized_limit,
DECODE (UPPER (adjstd.interest_rate_type),
'NULL', NULL,
NVL (adjstd.interest_rate_type, orgn.interest_rate_type)
) interest_rate_type,
COALESCE (adjstd.ltv, orgn.ltv, NULL) ltv,
DECODE (UPPER (adjstd.arrears_cycle_type),
'NULL', NULL,
NVL (adjstd.arrears_cycle_type, orgn.arrears_cycle_type)
) arrears_cycle_type,
COALESCE (adjstd.recovery_amt, orgn.recovery_amt, NULL) recovery_amt,
COALESCE (adjstd.wrtoff_amt, orgn.wrtoff_amt, NULL) wrtoff_amt,
COALESCE (adjstd.utilization_rate,
orgn.utilization_rate,
NULL
) utilization_rate,
DECODE (UPPER (adjstd.pd_pool),
'NULL', NULL,
NVL (adjstd.pd_pool, orgn.pd_pool)
) pd_pool,
COALESCE (adjstd.pd_value_pct, orgn.pd_value_pct, NULL) pd_value_pct,
DECODE (UPPER (adjstd.lgd_pool),
'NULL', NULL,
NVL (adjstd.lgd_pool, orgn.lgd_pool)
) lgd_pool,
COALESCE (adjstd.lgd_value_pct, orgn.lgd_value_pct,
NULL) lgd_value_pct,
DECODE (UPPER (adjstd.ead_pool),
'NULL', NULL,
NVL (adjstd.ead_pool, orgn.ead_pool)
) ead_pool,
COALESCE (adjstd.presec_precrm_ead,
orgn.presec_precrm_ead,
NULL
) presec_precrm_ead,
COALESCE (adjstd.postsec_precrm_ead,
orgn.postsec_precrm_ead,
NULL
) postsec_precrm_ead,
COALESCE (adjstd.postsec_postcrm_ead,
orgn.postsec_postcrm_ead,
NULL
) postsec_postcrm_ead,
COALESCE (adjstd.expected_loss_amt,
orgn.expected_loss_amt,
NULL
) expected_loss_amt,
COALESCE (adjstd.postsec_rwa, orgn.postsec_rwa, NULL) postsec_rwa,
DECODE (UPPER (adjstd.risk_rating_system),
'NULL', NULL,
NVL (adjstd.risk_rating_system, orgn.risk_rating_system)
) risk_rating_system,
DECODE (UPPER (adjstd.default_ind),
'NULL', NULL,
NVL (adjstd.default_ind, orgn.default_ind)
) default_ind,
DECODE (UPPER (adjstd.LOB),
'NULL', NULL,
NVL (adjstd.LOB, orgn.LOB)
) LOB,
DECODE (UPPER (adjstd.row_source),
'NULL', NULL,
NVL (adjstd.row_source, orgn.row_source)
) row_source,
COALESCE (adjstd.postsec_authorized_limit,
orgn.postsec_authorized_limit,
NULL
) postsec_authorized_limit,
COALESCE (adjstd.recovery_amt_calc,
orgn.recovery_amt_calc,
NULL
) recovery_amt_calc,
adjstd.adj_cycle_id adj_cycle_id,
orgn.curr_warehouse_inst_key curr_warehouse_inst_key,
orgn.curr_ccis_prod curr_ccis_prod, adjstd.load_time load_time,
adjstd.update_time update_time
FROM summary.osfi_feed_core_data orgn, summary.ncr_adj_data adjstd
WHERE orgn.ntrl_k_odc_instrument = adjstd.ntrl_k_odc_instrument
UNION ALL
SELECT orgn.month_end_date, orgn.ntrl_k_odc_instrument,
orgn.processing_system, orgn.source_system, orgn.ssb_type_indicator,
orgn.basel_exposure_class, orgn.basel_exposure_subclass,
orgn.ccis_product_code, orgn.warehouse_instrument_key,
orgn.instrument_status, orgn.instrument_open_flag,
orgn.instrument_dwo_flag, orgn.instrument_closed_flag,
orgn.instrument_arrears_flag, orgn.instrument_npna_flag,
orgn.account_open_dt, orgn.account_close_dt,
orgn.instrument_insured_ind, orgn.instrument_securitized_ind,
orgn.country_code, orgn.province, orgn.presec_outstanding_bal,
orgn.postsec_outstanding_bal, orgn.presec_authorized_limit,
orgn.interest_rate_type, orgn.ltv, orgn.arrears_cycle_type,
orgn.recovery_amt, orgn.wrtoff_amt, orgn.utilization_rate,
orgn.pd_pool, orgn.pd_value_pct, orgn.lgd_pool, orgn.lgd_value_pct,
orgn.ead_pool, orgn.presec_precrm_ead, orgn.postsec_precrm_ead,
orgn.postsec_postcrm_ead, orgn.expected_loss_amt, orgn.postsec_rwa,
orgn.risk_rating_system, orgn.default_ind, orgn.LOB, orgn.row_source,
orgn.postsec_authorized_limit, orgn.recovery_amt_calc, 0,
orgn.curr_warehouse_inst_key curr_warehouse_inst_key,
orgn.curr_ccis_prod curr_ccis_prod, SYSDATE, SYSDATE
FROM osfi_feed_core_data orgn
WHERE NOT EXISTS (SELECT ntrl_k_odc_instrument
FROM ncr_adj_data
WHERE ntrl_k_odc_instrument = orgn.ntrl_k_odc_instrument);When i refresh the materialized view its taking 5 to 6 mins. I have used DBMS_ADVISOR.TUNE_MVIEW to tune the query, but it raised error as
ORA-13600: error encountered in Advisor
QSM-03113: Cannot tune the MATERIALIZED VIEW statement
QSM-02091: mv references a non-repeatable or session-sensitive expression
QSM-02164: the materialized view is BUILD DEFERRED
ORA-06512: at "SYS.DBMS_SYS_ERROR", line 86
ORA-06512: at "SYS.PRVT_ACCESS_ADVISOR", line 202
ORA-06512: at "SYS.PRVT_TUNE_MVIEW", line 1232
ORA-06512: at "SYS.DBMS_ADVISOR", line 753
ORA-06512: at line 221
Can anyone suggest some methods to increase the peformance of the view.
Hi,
Here is the explain plan of the query,
Plan
SELECT STATEMENT ALL_ROWSCost: 626 Bytes: 35,803,043 Cardinality: 144,937
18 PX COORDINATOR
17 PX SEND QC (RANDOM) PARALLEL_TO_SERIAL SYS.:TQ10002
16 BUFFER SORT PARALLEL_COMBINED_WITH_PARENT Cost: 626 Bytes: 35,803,043 Cardinality: 144,937
15 UNION-ALL PARALLEL_COMBINED_WITH_PARENT
7 HASH JOIN PARALLEL_COMBINED_WITH_PARENT Cost: 314 Bytes: 7,803 Cardinality: 17
4 BUFFER SORT PARALLEL_COMBINED_WITH_CHILD
3 PX RECEIVE PARALLEL_COMBINED_WITH_PARENT Cost: 3 Bytes: 3,859 Cardinality: 17
2 PX SEND BROADCAST PARALLEL_FROM_SERIAL SYS.:TQ10000 Cost: 3 Bytes: 3,859 Cardinality: 17
1 TABLE ACCESS FULL TABLE SUMMARY.NCR_ADJ_DATA Cost: 3 Bytes: 3,859 Cardinality: 17
6 PX BLOCK ITERATOR PARALLEL_COMBINED_WITH_CHILD Cost: 310 Bytes: 33,625,384 Cardinality: 144,937
5 TABLE ACCESS FULL TABLE PARALLEL_COMBINED_WITH_PARENT SUMMARY.OSFI_FEED_CORE_DATA Cost: 310 Bytes: 33,625,384 Cardinality: 144,937
14 HASH JOIN RIGHT ANTI PARALLEL_COMBINED_WITH_PARENT Cost: 312 Bytes: 35,795,240 Cardinality: 144,920
11 BUFFER SORT PARALLEL_COMBINED_WITH_CHILD
10 PX RECEIVE PARALLEL_COMBINED_WITH_PARENT Cost: 1 Bytes: 255 Cardinality: 17
9 PX SEND BROADCAST PARALLEL_FROM_SERIAL SYS.:TQ10001 Cost: 1 Bytes: 255 Cardinality: 17
8 INDEX FULL SCAN INDEX SUMMARY.INDEX_2 Cost: 1 Bytes: 255 Cardinality: 17
13 PX BLOCK ITERATOR PARALLEL_COMBINED_WITH_CHILD Cost: 310 Bytes: 33,625,384 Cardinality: 144,937
12 TABLE ACCESS FULL TABLE PARALLEL_COMBINED_WITH_PARENT SUMMARY.OSFI_FEED_CORE_DATA Cost: 310 Bytes: 33,625,384 Cardinality: 144,937 There is no index on the tables and it contains lakhs of records.
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I created materialized views using multiple base tables in my local server and the base tables got populated using a long process.
Now I want to copy those data alone to some remote server since it doesn't have any base tables in it. For now, the remote server should depends on the localserver's data. I'm going to use the remote server's data for some testing purposes.
I know it is easy to create mat.views in the remote server but it doesn't have I don't want to do that now. I just want to copy the snapshots from my local server to the remote server.
Please let me know how to do that.
Thanks. -
Issue with creation of a materialized view
Hi,
I have a SQL query that works fine.
But when I create a materialized view using the query, a few columns in the MV do not get populated at all.
What could be the issue here?
regards
PremHi,
Thanks for the reply. Here is the code.
CREATE MATERIALIZED VIEW EDW.MV_OPPTY_ACTIVITY_AGG
TABLESPACE EDW_DIM_DAT
NOCACHE
LOGGING
NOCOMPRESS
NOPARALLEL
BUILD IMMEDIATE
REFRESH COMPLETE ON DEMAND
WITH PRIMARY KEY
AS
select
OPPTY_ID OPPTY_ID,
OPPORTUNITY_KEY OPPORTUNITY_KEY,
oppty_number oppty_number ,
SALES_CONSULTANT_HIST_KEY SALES_CONSULTANT_HIST_KEY ,
company_add_source_key company_add_source_key,
SALES_CONSULTANT_ID SALES_CONSULTANT_ID,
ACTIVITY_TYPE ACTIVITY_TYPE ,
activity_DATE activity_DATE ,
LAST_MODIFIED_DATE LAST_MODIFIED_DATE ,
CUSTOMER_FLAG CUSTOMER_FLAG,
SALES_EMPLOYEE_HIST_KEY,
milestone_KEY,
oppty_milestone_name_hist stage_name,
oppty_milestone_id_hist stage_id,
milestone_prob prob_to_close,
start_date oppty_start_date,
oppty_close_date oppty_close_date,
end_date oppty_end_date,
sum(DURATION) TOTAL_DURATION,
sum (CASE WHEN ACTIVITY_type IN ('CU14', 'CU15', 'CU16', 'CU17',
'CU18', 'CU19', 'CU20', 'CU21') THEN DURATION ELSE 0 END ) CQM_DURATION,
sum (CASE WHEN ACTIVITY_type = 'CU01' THEN DURATION ELSE 0 END ) TRADE_SEM_DURATION,
sum( CASE WHEN ACTIVITY_type = 'CU02' THEN DURATION ELSE 0 END ) RFP_RFI_DURATION,
sum( CASE WHEN ACTIVITY_type = 'CU03' THEN DURATION ELSE 0 END ) INFO_GATH_DURATION,
sum( CASE WHEN ACTIVITY_type = 'CU04' THEN DURATION ELSE 0 END ) PREP_DURATION,
sum( CASE WHEN ACTIVITY_type = 'CU05' THEN DURATION ELSE 0 END ) PRES_DEMO_DURATION,
sum( CASE WHEN ACTIVITY_type = 'CU06' THEN DURATION ELSE 0 END ) POC_DURATION,
sum ( CASE WHEN ACTIVITY_type = 'CU07' THEN DURATION ELSE 0 END ) PRE_CUST_SUPP_DURATION,
sum( CASE WHEN ACTIVITY_type = 'CU08' THEN DURATION ELSE 0 END ) POST_CUST_SUPP_DURATION,
sum( CASE WHEN ACTIVITY_type = 'CU09' THEN DURATION ELSE 0 END ) PARTNER_SUPP_DURATION,
sum( CASE WHEN ACTIVITY_type = 'CU10' THEN DURATION ELSE 0 END ) TRAVEL_DURATION,
sum( CASE WHEN ACTIVITY_type = 'CU11' THEN DURATION ELSE 0 END ) KEYCODES_DURATION,
sum( CASE WHEN ACTIVITY_type = 'CU12' THEN DURATION ELSE 0 END ) SI_SUPP_DURATION,
sum ( CASE WHEN ACTIVITY_type = 'CU13' THEN DURATION ELSE 0 END ) CHANNEL_SUPP_DURATION,
sum( CASE WHEN ACTIVITY_type = 'CU23' THEN DURATION ELSE 0 END ) MIGRATION_DURATION ,
max(LICENSE_USD) LICENSE_USD ,
MAX(LICENSE_LOCAL) LICENSE_LOCAL,
MAX(maintAINANCE_usd) maintAINANCE_usd,
MAX(maintAINANCE_LOCAL) maintAINANCE_LOCAL,
MAX(TRAINING_USD) training_usd,
MAX(TRAINING_LOCAL) training_LOCAL,
MAX(CONSULTING_USD) consulting_usd,
MAX(CONSULTING_LOCAL) consulting_LOCAL,
MAX(RENEWALS_USD) renewals_usd ,
MAX(RENEWAL_local) RENEWAL_local,
max(LOBANALYTICS2_LOCAL) epm_local,
max(LOBDATAINTEGRATION2_LOCAL) eim_local,
max(IDD_AMOUNT_LOCAL) idd_local,
max(ONDEMAND_AMOUNT_LOCAL) ondemand_local,
max(LOBANALYTICS2_usd) epm_usd,
max(LOBDATAINTEGRATION2_usd) eim_usd,
max(IDD_AMOUNT_usd) idd_usd,
max(ONDEMAND_AMOUNT_usd) ondemand_usd
FROM edw.sales_consulting_activity_fct t1 ,
select
o.oppty_id_number,
o.oppty_id,
O.OPPORTUNITY_KEY,
LICENSE_USD LICENSE_USD ,
LICENSE_LOCAL LICENSE_LOCAL,
o.FYM_USD maintAINANCE_usd,
o.FYM_LOCAL maintAINANCE_LOCAL,
o.TRAINING_USD training_usd,
o.TRAINING_LOCAL training_LOCAL,
o.CONSULTING_USD consulting_usd,
o.CONSULTING_LOCAL consulting_LOCAL,
o.RENEWAL_USD renewals_usd ,
o.RENEWAL_local RENEWAL_local ,
o.LOBANALYTICS2_LOCAL,
o.LOBANALYTICS2_usd,
o.LOBDATAINTEGRATION2_LOCAL,
o.IDD_AMOUNT_LOCAL,
o.ONDEMAND_AMOUNT_LOCAL,
o.LOBDATAINTEGRATION2_usd,
o.IDD_AMOUNT_usd,
o.ONDEMAND_AMOUNT_usd
from edw.opportunity_hist_fact o
where o.SOURCE_SYSTEM='SFDC'
and upper(status)='ACTIVE'
and o.last_modified_date = (select max(last_modified_date )from edw.opportunity_hist_fact o2 where o.opportunity_key = o2.opportunity_key))T2,
( Select activity_key,OPPTY_ID_NUMBER, MIL.milestone_KEY,MIL.milestone_name oppty_milestone_name_hist,milestone_id
oppty_milestone_id_hist, milestone_prob,start_date,oppty_close_date,end_date FROM
EDW.opportunity_hist_fact OPP,
edw.milestone MIL,
edw.sales_consulting_activity_fct act WHERE
ACTIVITY_DATE >=start_date (+) and activity_date <=opp.last_modified_date(+)
and OPP.OPPTY_ID_NUMBER (+) =act.OPPTY_NUMBER
and OPP.milestone_key =MIL.milestone_key(+) ) T3
where t1.oppty_NUMBER (+) =T2.OPPTY_ID_NUMBER
and t1.activity_key=t3.activity_key
--and oppty_number ='279749'
GROUP BY OPPTY_ID,
oppty_number,
OPPORTUNITY_KEY,
SALES_CONSULTANT_HIST_KEY ,
company_add_source_key,
SALES_CONSULTANT_ID,
SALES_EMPLOYEE_HIST_KEY,
ACTIVITY_TYPE ,
ACTIVITY_DATE ,
LAST_MODIFIED_DATE,
CUSTOMER_FLAG,
milestone_KEY,
oppty_milestone_name_hist,
oppty_milestone_id_hist,
milestone_prob,
start_date,
oppty_close_date,
end_date;
Regards,
Prem -
Select query in materialized view with two dblinks
Hi All,
We have oracle 10g On windows.
We are trying to create materialized view. Scenario is we have base table on other database and we are creating mview on different database.
Basa database have two schema's and i am selecting records from that two schema's using two private db links.
But when i am tryin gto create mview its not getting created. After 15 hrs. its still showing creation command and not finished.
Query is :-
Is it good practice to have two db links in select query of materialized view.Billy Verreynne wrote:
Chanchal Wankhade wrote:
Is it good practice to have two db links in select query of materialized view.Same db link being used twice, or two different db links?
If the former, you ideally want the local Oracle db to send the join to the remote database, and for the remote database to drive the join between those 2 tables. There is a hint (<i>driving_site</i>) that can be used - or the join query can be defined on the remote database as a view, and the local materialised view can then use that remote view.
If you have 2 different db links and joining across these - usually a bad idea to perform distributed database joins. There are lots of limitations as to how the tables can be joined. Worse case, full table scans of both remote tables, pulling all the rows from the 2 remote database tables to the local database, and joining these on the local database.
I have seen some severe performance issues in the past as a result of distributed joins. I'll rather use 2 materialised views for pulling both distributed tables's data locally, and then do the join on local data (using indexes, partition pruning, etc)Hi Billy,
My scenario is i have two database database A and database B. Database A is having two schema's SCOTT AND HR. SCOTT schema have select privileges on HR schema.
DB LINK is between Database B to Database A. name is db.link.B.A.oracle.com.
What if i priovide while creating materialized view, the schema name before the table name in database B for this particuler table so it will pick up the table from that schema using same DB LINK(db.link.B.A.oracle.com.) that i am using to fetch records from SCOTT schema.
Above schnario is like two base schema's and one db link using two schema. -
Leave a distinct value in a materialized view on two tables
Hi and thank you for reading,
I have the following problem. I am creating a materialized view out of two tables, with "where a.id = b.id".
The resulting materialized view list several values twice. For example, one customer name has several contact details and thus the customer name is listed several times. Now I would like to join each customer name with just ONE contact detail, how can I do that? (Even if I would loose some information while doing this).
Thanks
EvgenyHi,
You can do this
SELECT deptno, empno, ename, job, mgr, hiredate, sal, comm
FROM emp_test
ORDER BY deptno;
DEPTNO EMPNO ENAME JOB MGR HIREDATE SAL COMM
10 7782 CLARK MANAGER 7839 1981-06-09 2450
10 7839 KING PRESIDENT 1981-11-17 5000 0
10 7934 MILLER CLERK 7782 1982-01-23 1300
20 7566 JONES MANAGER 7839 1981-04-02 2975
20 7902 FORD ANALYST 7566 1981-12-03 3000
20 7876 ADAMS CLERK 7788 1987-05-23 1100
20 7369 SMITH CLERK 7902 1980-12-17 800
20 7788 SCOTT ANALYST 7566 1987-04-19 3000
30 7521 WARD SALESMAN 7698 1981-02-22 1250 500
30 7844 TURNER SALESMAN 7698 1981-09-08 1500
30 7499 ALLEN SALESMAN 7698 1981-02-20 1600 300
30 7900 JAMES CLERK 7698 1981-12-03 950
30 7698 BLAKE MANAGER 7839 1981-05-01 2850
30 7654 MARTIN SALESMAN 7698 1981-09-28 1250 1400
14 rows selected.
SELECT CASE
WHEN ROW_NUMBER () OVER (PARTITION BY deptno ORDER BY empno) =
1
THEN deptno
END deptno,
empno, ename, job, mgr, hiredate, sal, comm
FROM emp_test;
DEPTNO EMPNO ENAME JOB MGR HIREDATE SAL COMM
10 7782 CLARK MANAGER 7839 1981-06-09 2450
7839 KING PRESIDENT 1981-11-17 5000 0
7934 MILLER CLERK 7782 1982-01-23 1300
20 7369 SMITH CLERK 7902 1980-12-17 800
7566 JONES MANAGER 7839 1981-04-02 2975
7788 SCOTT ANALYST 7566 1987-04-19 3000
7876 ADAMS CLERK 7788 1987-05-23 1100
7902 FORD ANALYST 7566 1981-12-03 3000
30 7499 ALLEN SALESMAN 7698 1981-02-20 1600 300
7521 WARD SALESMAN 7698 1981-02-22 1250 500
7654 MARTIN SALESMAN 7698 1981-09-28 1250 1400
7698 BLAKE MANAGER 7839 1981-05-01 2850
7844 TURNER SALESMAN 7698 1981-09-08 1500
7900 JAMES CLERK 7698 1981-12-03 950
14 rows selected.Edited by: Salim Chelabi on 2009-09-14 08:13 -
Use of db sequence in a materialized view
Hi,
Will it be possible to use a database sequence in a materialized view?
The materialized view is to return the result set of query that joins multiple tables. One of the columns in the result set - the to-be-created materialized view - is null and requires a sequence.
Will it be possible to include a db sequence in the query?
Example:
create materialized view example_mview
as
select example_sequence.nextval, table1.'*', table2.'*'
from example_table1 table1, example_table2 table2
where table1.id=table2.idWhat is the purpose of such numbering? To number each row?
If so - then use ROWNUM as 1st column.
SQL>with ddd
as
(select 333 COL from dual union all select 5444 COL from dual)
select rownum,COL from ddd;ROWNUM COL
1 333
2 5444
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