/******************************************************************************
 * Programme : SAS-Performance optimieren: So nutzen Sie die Dataset-Option INDEX= effizient
 * Reference : SASDATB6B0
 * Source    : https://www.wearecas.eu/fr/sampleCode/SASDATB6B0
 ******************************************************************************/

/* --- 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;