Micron Technology Incorporated

Neelima Premsankar

David Boles

Gregory Becker

Gaurav Sanjay Ramdasi

A prefix probe component receives a request to perform a cursor operation to search for one or more data elements of a key-value data store, the request comprising a key identifier associated with the one or more data elements, and wherein the key-value data store comprises a tree structure with a plurality of nodes; traverses a portion of the plurality of nodes to identify data elements in the key-value data store that match the key identifier; determines whether a number of the data elements that match the key identifier satisfies a threshold condition; and responsive to determining that the number of data elements satisfies the threshold condition, performs the cursor operation for the data elements that match the key identifier.

Prefix probe for cursor operations associated with a key-value database system

A global lock is used to access a first set of data structures. An active transaction having a transaction start identifier is identified as a globally oldest active transaction associated with the first set of data structures. A first marker value of a first data structure of a second set of data structures is compared to the transaction start identifier to determine satisfaction of a first condition. In response to satisfying the first condition, the first data structure is accessed to identify a first set of data locks associated with one or more transactions each having a transaction completion identifier that satisfies a second condition when compared to the transaction start identifier. In response to satisfying the second condition, the first set of data locks is released.

Lock release management associated with a key-value database system

An example method of cursor seek operations using deleted record spans in memory sub-systems comprises: receiving, by a processing device, a request to search for a first data element of a key-value data store, the request specifying a first key associated with the first data element; determining that the first key is within a range of deleted data elements comprising a plurality of deleted data elements of the key-value data store; identifying a tail key associated with a tail element of the range of deleted data elements; identifying a second data element in the key-value data store, wherein the second data element is associated with a second key that follows the tail key in a specified order of keys; and providing the second data element in response to the request.

Cursor seek operations using deleted record spans

A first data structure lock to access a first data structure of a first set of data structures to perform an operation associated with a transaction is acquired. The operation associated with the transaction is executed, wherein the operation is one of inserting the transaction into the first data structure or removing the transaction from the first data structure. An oldest active transaction of the first data structure is identified. A globally oldest active transaction of the set of the data structures in view of the oldest active transaction is determined. A second set of data structures is accessed, the second set of data structures including information associated with completed transactions to identify a set of data locks associated with completed transactions each having a transaction completion identifier that satisfies a condition when compared to a transaction start identifier associated with the globally oldest active transaction. The set of data locks are released.

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Austin, TX, United States of America

Neelima Premsankar