Oracle International Corporation

Vishvesh Mohanarangam Selvakumaar

Juan R Loaiza

Wei-Ming Hu

William Havinden Bridge, Jr

J William Lee

Neil J S MacNaughton

Adam Y Lee

Vipin Gokhale

Ankur Kemkar

Sivaram Prasad Soma

Techniques herein store database blocks (DBBs) in byte-addressable persistent memory (PMEM) and prevent tearing without deadlocking or waiting. In an embodiment, a computer hosts a DBMS. A reader process of the DBMS obtains, without locking and from metadata in PMEM, a first memory address for directly accessing a current version, which is a particular version, of a DBB in PMEM. Concurrently and without locking: a) the reader process reads the particular version of the DBB in PMEM, and b) a writer process of the DBMS replaces, in the metadata in PMEM, the first memory address with a second memory address for directly accessing a new version of the DBB in PMEM. In an embodiment, a computer performs without locking: a) storing, in PMEM, a DBB, b) copying into volatile memory, or reading, an image of the DBB, and c) detecting whether the image of the DBB is torn.

Persistent memory file store for directly mapped persistent memory database

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Vancouver, Canada

Vishvesh Mohanarangam Selvakumaar