Memory system capable of effectively storing a plurality of write data grouped into a transaction and operating method thereof

Abstract

A memory system includes a write buffer and a controller. The controller, when, among write data, first write data which are grouped into a transaction are inputted to the write buffer, receives total size information of a transaction for completion of commit of the first write data. The controller checks, at a time of performing an actual flush operation for the write buffer check, in the case where it is determined that commit-uncompleted first write data are included in the write buffer, a size of a space left in the write buffer by simulating a flush operation with the commit-uncompleted first write data excluded from the simulated flush operation, compares a checked size of the space left in the write buffer and the total size information, and determines whether to include the commit-uncompleted first write data in the actual flush operation depending on a comparison result.