Sap Se

Vmware, Inc.

Neeraj Kulkarni

Mihnea Andrei

Vivek Kandiyanallur

Panfeng Zhou

Adrian Dragusanu

Dheren Gala

Nilesh Gohad

Xin Liu

Christian Bensberg

Daniel Ritter

Robert Schulze

Holger Bischoff

Sam Arun Raj Seeniraj

Sriranga Seetharamaiah

A method, a system, and a computer program product for generating a pageable hash index for a document store. A hash map index for data stored on disk using a document array is generated. The hash map index includes a plurality of hash values with each hash value identifying a document stored at a predetermined location in the document array. A transaction for executing using a first document stored in the document array is received. Using the generated hash map index, a location of the first document stored in the document array is identified. At least a portion of a first hash value of the hash map index corresponding to the first document is loaded into a memory location without loading the remaining hashes of the hash map index. Based on the loaded portion of the first hash value, the received transaction is executed.

Pageable hash index for document store

Various embodiments for providing a data transfer and management system are described herein. An embodiment operates by determining that data of a column is stored in a column loadable format in which all of the data of the column is moved from the disk storage location to a memory responsive to a data request. A data vector that identifies a plurality of value IDs corresponding to at least a subset of the plurality of rows of the column, is identified. A page format that provides that a portion of the data of the column across a subset of the plurality of rows is moved from the second disk storage location into the memory responsive to the data request is determined. The entries of the data vector are requested, converted from column loadable format into the page persistent format, and stored across one or more memory pages.

Data transfer and management system for in-memory database

A system and method, including determining, by a processor, a data type for each column of a database table; determining, by the processor and based on the determined data type for each column of the database table, an indication of a size of the database table; calculating, by the processor and based on the determined indication of the size of the database table, a start nbit size for a nbit compression process to be used on the database table; specifying, by the processor, the calculated start nbit size for the nbit compression process; and compressing the database table by executing the nbit data compression process using the specified start nbit size.

Smart rollover

Disclosed herein are system, method, and computer program product embodiments for creating a dictionary-free index. An embodiment operates by a database maintaining database table comprises a column and a row. The database creates a concatenated string index comprising a concatenated string value based on the database column's row. The database also creates a hash value list having a hash value based on the concatenation string index's concatenated string value. Thereafter, the database creates a directory having a pointer to (i) a row position of the hash value list or (ii) a row position of a collision list having the row position of the hash value in the hash value list. The database also creates a collision list containing the row positions of the hash values occurring multiple times in the hash value list. The index for the database table includes the hash value list, the directory, and the collision list.

Hash composite indexes

According to a system and method for composing a virtual disk for a virtual desktop, the virtual desktop is booted from a virtual disk comprised of a base disk image and a user delta disk image that receives all disk writes to the virtual disk. Disk space is allocated on the virtual disk for a file associated with a selected application to be provided to a user of the virtual desktop. Then the virtual desktop is recomposed offline by linking the base disk image, an application delta disk image including the file associated with the selected application, and the user delta disk image. The recomposing includes modifying meta data of the application delta disk and the user delta disk so that the file associated with the selected application is mapped to the disk space previously allocated.

Composing a virtual disk using application delta disk images

A technique for composing a virtual desktop associated with one or more applications in a virtualized computing environment. The technique includes generating file system level metadata in the desktop image for applications that create a perception that data blocks in the desktop image have been allocated to applications, but not actually copying any of the application data into the allocated blocks. Instead, the technique builds a mapping table between disk block numbers and the application data, which can be stored in a separate application store. The disclosed techniques provide a more efficient way to compose a virtual desktop, compared to current virtual desktop adoption techniques.

Growing community of inventors

Pune, India

Neeraj Kulkarni