Table design one-to-one relation

For a big table such as this: PROJECT_TABLE which contains 75 columns. But, only 40 columns are frequently searched against, i.e., the user enter some criteria on a web page, then start the search. The rest 35 columns are used on as-needed basis, i.e., only if the user want to view a specific record (in the returned search result). I am afraid that as the records grow, someday, the search will slow down (due to the large number of columns in the table).
So, I plant to break the PROJECT_TABLE into two separate tables PROJECT_PARENT (project_id) and PROJECT_CHILD (project_id) and reference them by one-to-one relation. By this way, when the user conducts the search, it will be done against the PROJECT_PARENT table; while when user wants to view a specific record, it will then retrieve the data by using one-to-one join of the two tables.
Like to know if it really help by breaking into two tables. What is your comment?
Thanks
Scott

scottjhn wrote:
For a big table such as this: PROJECT_TABLE which contains 75 columns. But, only 40 columns are frequently searched against, i.e., the user enter some criteria on a we page, then start the search. The rest 35 columns are used on as-needed basis, i.e., only if the user want to view a specific record (in the returned search result). I am afraid that as the records grow, someday, the search will slow down (due to the large number of columns in the table).
So, I plant to break the PROJECT_TABLE into two separate tables PROJECT_PARENT (project_id) and PROJECT_CHILD (project_id) and reference them by one-to-one relation. By this way, when the user conducts the search, it will be done against the PROJECT_PARENT table; while when user wants to view a specific record, it will then retrieve the data by using one-to-one join of the two tables.
Like to know if it really help by breaking into two tables. What is your comment?if you proceed, performance will be worse than if you do nothing.
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<REMOVED BY MODERATOR>
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Message was edited by:
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To make it simple here is the sample code.
CREATE TABLE my_storegroup_gbcust
store_grp_id        NUMBER(6)                 NOT NULL,
group_buy_cust_num NUMBER(5)                 NOT NULL
INSERT INTO my_storegroup_gbcust (store_grp_id, group_buy_cust_num ) VALUES (1002, 70001);
INSERT INTO my_storegroup_gbcust (store_grp_id, group_buy_cust_num ) VALUES (1003, 70001);
INSERT INTO my_storegroup_gbcust (store_grp_id, group_buy_cust_num ) VALUES (1004, 70001);
INSERT INTO my_storegroup_gbcust (store_grp_id, group_buy_cust_num ) VALUES (1005, 70001);
INSERT INTO my_storegroup_gbcust (store_grp_id, group_buy_cust_num ) VALUES (1006, 70001);
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INSERT INTO my_storegroup_gbcust (store_grp_id, group_buy_cust_num ) VALUES (35001, 27010);
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1002               70001
1003               70001
1004               70001
1005               70001
1006               70001
2001               65000
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35001               27010
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1005               1
2001               1
1003               1
1002               1
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2001               1
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Dear all,
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well, I think it's not allowed
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887274 wrote:
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Table design one-to-one relation

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