Ori Software Development Ltd.

Moshe Shadmon

A data processing system including a processor device associated with memory device. The processor is capable of running user application programs to communicate with a database management system that includes database file management system, for accessing data records stored in the memory. The database file management system includes: a probabilistic access indexing file (PAIF) having a plurality of nodes and links. The leave nodes of the PAIF are associated with data records accessible to the user application program. A portion of the data record constitutes a search-key. Selected nodes in the PAIF represent an offset of a search key portion within a search key and link(s) originated from each node among the selected nodes. For each of the selected nodes, except for the leaf node, there exists a subordinated node having an offset larger than the offset of the selected node. A search path in the PAIF commences from a root node and ends at a leaf node which is associated with a given search key. The search path defines a first series of I search key portion values at the corresponding I offsets which conform to a second series of I search key portions at the same I offsets within the given search key.

Database apparatus

In a database file management system for accessing data records that correspond to items in a directory. The directory items are linked to a trie index that is arranged in blocks and being stored in a storage medium. The trie index enables accessing or updating the directory items data records by key or keys and being susceptible to an unbalanced structure of blocks. There is provided a method for constructing a layered index arranged in blocks, which includes the steps of providing the trie index and constructing a representative index over the representative keys of the trie index. The layered index enables accessing or updating the directory items by key or keys and it constitutes a balanced structure of blocks.

Method for organizing directories

In a database file management system for accessing data records and being executed on data processing system. The data records are linked to a trie index that is arranged in blocks and being stored in a storage medium. The trie index enables accessing or updating the data records by key or keys and being susceptible to an unbalanced structure of blocks. There is provided a method for constructing a layered index arranged in blocks, which includes the steps of providing the trie index and constructing a representative index over the representative keys of the trie index. The layered index enables accessing or updating the data records by key or keys and it constitutes a balanced structure of blocks.

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Tel Aviv, Israel

Moshe Shadmon