Abstract: Systems and methods for providing consistent metadata in a cluster database system are disclosed. Each node contains a number of LDAP server instances, as well as a monitor process. Each node contains a node shared memory, and the cluster contains a cluster shared memory stored on a directory store. When a client alters metadata in one of the LDAP server instances, the LDAP server instances writes the changes to the directory store, and provides update information, such as a version number, to the node shared memory. Other server instances on that node poll the node shared memory to determine whether updates have been made. If updates have been made, the other server instances update their on-heap caches based on the directory store. Each monitor process determines whether changes have been made to the cluster shared memory, and if so, updates the node shared memory based on the directory store.

Abstract: Archival in a computer is performed by creating a process if an item to be copied is a directory, and alternatively by copying the item if the item is a file. The created process in turn recursively performs the just-described acts, e.g. the act of creating or copying, with another item located in the just-described directory. Therefore, depending on the number of directories to be copied, a corresponding number of processes may be created, which speeds up copying. A default limit on a resource available to a copy process may be set to a maximum limit for the resource, for speedy copying. Archival may be speeded up by transferring data from the file into a temporary buffer, locking the temporary buffer, and invoking a direct memory access (DMA) process. Archival may be speeded up also by checking for and eliminating the copying of circular links (such as a symbolic link that points to itself).

Abstract: Archival in a computer is performed by creating a process if an item to be copied is a directory, and alternatively by copying the item if the item is a file. The created process in turn recursively performs the just-described acts, e.g. the act of creating or copying, with another item located in the just-described directory. Therefore, depending on the number of directories to be copied, a corresponding number of processes may be created, which speeds up copying. A default limit on a resource available to a copy process may be set to a maximum limit for the resource, for speedy copying. Archival may be speeded up by transferring data from the file into a temporary buffer, locking the temporary buffer, and invoking a direct memory access (DMA) process. Archival may be speeded up also by checking for and eliminating the copying of circular links (such as a symbolic link that points to itself).