Sap Se

Jaehwa Kim

Joo Yeon Lee

Joongkoo Lee

Taehyung Lee

Eunsang Kim

Kyungyul Park

Various systems and methods for selective revalidation of data objects are provided. In one example, a computer-implemented method includes updating a target data object of a database system according to a definition statement, and determining whether the definition statement changes one or more object properties of the target data object. In response to determining that the definition statement changes the one or more object properties of the target data object, the method includes revalidating data objects depending on the target data object. In response to determining that the definition statement does not change the one or more object properties of the target data object, the method includes not revalidating the data objects depending on the target data object. In this way, database management performance and speed may be improved while maintaining validity of data objects in a database.

Fine-grained decision on propagation of revalidation

Methods and systems are disclosed for managing replication of metadata in a master-slave database environment. While metadata is managed on a master node using database tables with transaction guarantees, metadata copies on the slave node are managed using a lightweight key-value store. In exemplary embodiments, master metadata database tables are mapped to respective key-value structures at one or more slave nodes. The key-value structures have entries pointing to respective metadata objects, which include copies of metadata items stored in the master metadata database tables. The key-value structures can be hierarchically organized under a parent key-value structure. Metadata object versions can be organized as a linked list to facilitate multi-version concurrency control. Methods are disclosed for building the key-value store, for retrieving metadata from the store, for updating the store, for providing multi-version concurrency control, and for pruning obsolete metadata versions. Variants are disclosed.

Key-value store for lightweight replication of metadata

Database revalidation may be provided by parallelized execution of distance-based groups. A change to a first data object of the plurality of data objects is received. The first data object has a plurality of dependent data objects in the plurality of data objects. A maximum dependency distance for the respective dependent data objects in the plurality of dependent data objects is calculated. The respective dependent data objects in the plurality of dependent data objects are grouped into one or more groups based on their respective maximum dependency distance. A given group of the one or more groups represents a given maximum dependency distance. The one or more groups are executed on in order from smallest to largest of their respective representations of maximum dependency distance. Executing on the one or more groups includes revalidating the data objects of a respective group in parallel.

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Seoul, South Korea

Jaehwa Kim