Hi List,
I have a table by name Benchmark_hdr with the following columns:
BENCHMARK_HDR_ID NUMBER NOT NULL
CALENDAR_TYPE CHAR (1),
UOM VARCHAR2 (10),
CALENDAR_PORT CHAR (1),
CUSTOMER_MOT_ID NUMBER NOT NULL
RESP_PARTY_NAME VARCHAR2 (10),
FROM_EVENT NUMBER,
TO_EVENT NUMBER,
LAST_UPDATED DATE
I have created foreign key constraints using the below commands:
ALTER TABLE BENCHMARK_HDR ADD CONSTRAINT BENCHAMRK_HDR_CUSTOMERESP_FK
FOREIGN KEY (RESP_PARTY_NAME, CUSTOMER_MOT_ID)
REFERENCES XM.CUSTOMER_RESPONSIBLE_PARTY (RESP_PARTY_NAME,
CUSTOMER_MOT_ID) ;
ALTER TABLE BENCHMARK_HDR ADD CONSTRAINT BENCHAMRK_HDR_CUSTOMEREVENT_FK
FOREIGN KEY (FROM_EVENT)
REFERENCES XM.CUSTOMER_EVENT (CUSTOMER_EVENT_ID) ON DELETE CASCADE;
ALTER TABLE BENCHMARK_HDR ADD CONSTRAINT BENCHMARK_HDR_CUSTOMEREVENT_FK
FOREIGN KEY (TO_EVENT)
REFERENCES XM.CUSTOMER_EVENT (CUSTOMER_EVENT_ID) ON DELETE CASCADE;
The foreign keys need to be indexed so that the child table is not locked
when a record in the parent table is being updated or deleted. If the
foreign keys are indexed the corresponding child record or records are only
locked when the parent table record is being updated or deleted. In this
context I would like to seek the advice of the list as to whether I should
create indexes on individual foreign keys or should I create one or more
composite index(es) on foreign keys? If I need to create a composite index
on which columns should I base my index on? Could anybody advise me on this
with the reasons for following that particular approach? Any help in this
regard is very much appreciated.
Thanks and Regards,
Ranganath
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Author: Krishnaswamy, Ranganath
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