wiritng about db systems and ppt

Using information available on the Internet (e.g., [login to view URL], wikis, Google Scholar, etc) Survey the following data models of modern databases: Document Stores Key-Value Stores Search Engines Wide-Column Stores Graph Stores Time-Series Databases   For each model above, write the following components: Definition Advantages compared to other models Disadvantages compared to other models Application Example Existing Technologies (open source or commercial)   Additional Requirement: Add numbered references (web URL or publications) at the end of your report and mark the citations in your writings/drawings.