The SPD Server SQL proxy
plans and executes SQL queries from SAS PROC SQL for implicit or explicit
SQL statements. The sasspds engine can respond in two ways. The sasspds
engine can request that the SPD Server host create an SQL proxy, or
the sasspds engine can use an existing user proxy as the SQL proxy.
(The user credentials of the SQL connection must be same as the credentials
for the user proxy for this to happen.) The sasspds engine then
sends implicit or explicit SQL statements to the SQL proxy on behalf
of PROC SQL.