Renee wrote:

HiAll Being a newbie i request your help.

I have a emp database. I store them based on emp id as well as ssn and need to store their extended details. What datatype is best used to store this info. I need to search through millions of emp recs that can be searched by either ssn or by emp id. do suggest. some fields are as below: emp id ssn emp first name emp last name emp sal emp age if we use map can have just one key value so it can be either ssn or emp id. using 2 maps one for ssn and emp record and another for emp id and emp record is not efficient as there are millions of records. ur help is appreciated. will multi index help in this case. do suggest.

-Renee

Hi, If you need to realize search based on these two fields MultiIndex seems the appropriated structure. If emp_id is an integer (unique) the use of a non-ordered index could give you better performances. The major problem is how to ensure this id is unique. I guess that ssn stands for Social Security Number, which is too big to fall on a builtin, so a string will be need. Again the use of a good hash could improve the performances. HTH, Vicente P.S. This kind of questions are better answered on the Boost User ML or even on Stack Overflow. -- View this message in context: http://boost.2283326.n4.nabble.com/Help-on-2-key-search-tp3530830p3531660.ht... Sent from the Boost - Dev mailing list archive at Nabble.com.