Java JNDI Search method performance

Question

Hi,
My requirement is i have more than 10 unique values for single a attribute. i need to retrieve all 10 records mathing it from LDAP using Java JNDI. But in LDAP there are more than 100 unique record in LDAP i need only 10 record that mathes my values.
For example the attribute ou in LDAP has 10 unique values. the values could be retrieved in two ways
Method one: Single Search
I could use a single search to LDAP with all the 10 values in filters
and retrieve all the value
Ex:
String filter = "(|(ou=1)(ou=2)(ou=3)(ou=4)(ou=5)(ou=6)(ou=7)(ou=8)(ou=9)(ou=10))";
NamingEnumeration answer = ctx.search(BASE_SEARCH, filter, ctls);
Method Two: Multiple Search
I could use a multiple search to LDAP for each value of ou
Ex:
String[] inputou ={"ou=1","ou=2","ou=3","ou=4","ou=5","ou=6","ou=7","ou=8","ou=9","ou=10"};
int inputSize=inputou.length;
for (int j=0;j<inputSize;j++){
Attributes matchattribs = new BasicAttributes(true);
matchattribs.put(new BasicAttribute("ou", inputou[j]));
NamingEnumeration answer2 = ctx.search(BASE_SEARCH,
               matchattribs, returnAttrs);
Query:
which method is more efficient single search or multiple search.
is it efficient to have mutiple search based on one specific ou or it is efficient to have single search with multiple ou using OR clause.
is it less efficient when executing an OR clause and searching with multiple ou.
Thanks

Answer 1

Hi,
They are equivalent becuase second method does not use a filter and for each iteration it creates new mathcing attributtes and executed the search to LDAP. My query is in method one the number of hit to LDAP is one in second method the number of hit to LDAP is 10 based on the number of ou.
I have checked this program and tracked through System.currentTimeMillis() using more than 1000 ou's. the time taken for method one is 3.2306666 mins and the time taken for method two is 4.61735. so it is clear that method one is more efficient in terms of time but still i need more detail answer because some say using OR clause in filter is less efficient than using ou=1.
Thanks