Abstract: A method, system, and computer usable program product for load balancing using replication delay are provided in the illustrative embodiments. In response to a request to update, a system updates data associated with a write server, forming updated data of a data partition. The system receives a read request for the data partition. The system calculates a time difference between an arrival time of the request to update and an arrival time of the read request. The system receives a set of average replication delays for a set of replica servers serving the data partition. The system directs the read request to a replica server in the set of replica servers whose average replication delay is less than or equal to the time difference.

Abstract: Disclosed is a method for improving performance of distributed directory servers, which includes identifying directory servers configured to serve a partition index; monitoring the directory servers to identify whether a primary directory server has reached a maximum number of allowable entries in the partition index; and dynamically allocating a secondary directory server to the partition index on determining that the primary directory server has reached the maximum number of allowable entries in the partition index.

Abstract: A mechanism for performing a sorted search in a distributed directory environment using a proxy server. A sorted search request for a set of top entries is sent to each backend server. The proxy server identifies a target server which returned a top entry in the set and sends another sorted search request to the target server for all entries having a sort order higher than or equal to the top entry and a sort order lower than or equal to the next top entry of the set, and returns the entries to a requesting client. The proxy server sends another sorted search request to the target server for a new top entry having a sort order greater than the next top entry and adds the new top entry to the set. The proxy server returns to the evaluating step until no top entries remain in the set.

Abstract: In association with a data processing system that includes one or more servers, one or more clients and a partitionable distributed directory contained in a database, a computer implemented method is provided for selectively processing data entries that reside in the directory. The method comprises the steps of generating a request to perform an operation on each data entry in a specified group of intended entries, and specifying a hashing control index that uniquely identifies each entry of the specified group, and excludes all other entries. The requested operation is applied only to data entries in the directory that are identified by the specified hashing control index.

Abstract: Dynamically adding n partitions to a distributed directory setup having x existing servers by modifying the configuration file to include the n new servers and implementing a replication setup mechanism with agreements to x+n?1 servers. The migration to dynamically add partitions is carried out while continuing to serve clients.

Abstract: The illustrative embodiments described herein provide a computer implemented method, apparatus, and computer program product for defining a condition based schema for a directory on a directory server. A schema is defined based on a protocol for querying directory services on a directory server. A conditional statement is added to the schema. Responsive to a determination that a first set of attributes within the conditional statement is evaluated to be true, requiring a value for a second set of attributes within the schema to be present in an entry. The conditional statement is enforced by the server rather than by an application accessing the directory.