A computer system includes transactional memory to implement a nested transaction. The computer system generates a plurality of speculative identification numbers (IDs), identifies at least one of a software thread executed by a hardware processor and a memory operation performed in accordance with an application code. The computer system assigns at least one speculative cache version to a requested transaction based on a corresponding software thread. The speculative ID of the corresponding software thread identifies the speculative cache version. The computer system also identifies a nested transaction in the memory unit, assigns a cache version to the nested transaction, detects a conflict with the nested transaction, determines a conflicted nesting level of the nested transaction, and determines a cache version corresponding to the conflicted nesting level. The computer system also invalidates the cache version corresponding to the conflicted nesting level.

A method includes a digital subscription management system (DSMS) receiving from a source system a request to perform an edit of at least one data object, the DSMS sending a request for response (RFR) to subscribing systems having a copy of the at least one data object, the DSMS receiving a response from the subscribing systems, and the DSMS performing the edit.

A controller maintains exposed and unexposed locations of a first storage device and a second storage device. In response to receiving a request a perform a write operation to write data in locations that span the first storage device and the second storage device, the controller atomically writes an entirety of the data in the unexposed locations of the first storage device.

A method includes a digital subscription management system (DSMS) receiving from a source system a request to perform an edit of at least one data object, the DSMS sending a request for response (RFR) to subscribing systems having a copy of the at least one data object, the DSMS receiving a response from the subscribing systems, and the DSMS performing the edit.