A related question:
Are any of these indexes redundant:
CREATE UNIQUE INDEX user_list_id_email ON user_list (owner_id,user_email);
CREATE INDEX user_list_owner_id ON user_list (owner_id);
CREATE INDEX user_list_oid_created ON user_list (owner_id,user_created);
In particular, is user_list_owner_id redundant to
user_list_oid_created? Will the latter be used for queries such as
SELECT user_fname from user_list where owner_id=34
If so, I can drop the owner_id index. the _id columns are integers,
created is a datetime, and email is a string. owner_id is also a
foreign key into the owners table (via REFERENCES), if that matters.
I'd try it out by dropping the index, but reindexing it takes a *LONG*
time which I cannot afford to be unavailable.
Thanks.
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Vivek Khera, Ph.D. Khera Communications, Inc.
Internet: khera@kciLink.com Rockville, MD +1-240-453-8497
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