/******************************************************************************
 * Programme : Optimisation SAS : Boostez vos performances avec l'option INDEX= dans l'étape DATA
 * Reference : OPTIONAC04
 * Source    : https://www.wearecas.eu/de/sampleCode/OPTIONAC04
 ******************************************************************************/

/* --- BLOC 1 --- */
data new(index=(ssn));
/* ... more SAS code ... */
run;

/* --- BLOC 2 --- */
data new(index=(cityst=(city state)));
/* ... more SAS code ... */
run;

/* --- BLOC 3 --- */
data new(index=(ssn cityst=(city state)));
/* ... more SAS code ... */
run;

/* --- BLOC 4 --- */
data new(index=(ssn /unique));
/* ... more SAS code ... */
run;

/* --- BLOC 5 --- */
data new(index=(ssn /nomiss));
/* ... more SAS code ... */
run;

/* --- BLOC 6 --- */
data new(index=(ssn /unique/nomiss cityst=(city state) /unique/nomiss));
/* ... more SAS code ... */
run;