tailieunhanh - Managing time in relational databases- P24

Tham khảo tài liệu 'managing time in relational databases- p24', công nghệ thông tin, cơ sở dữ liệu phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 448 THE ASSERTED VERSIONING GLOSSARY temporal data management taxonomy queryable temporal data Mechanics any method of managing temporal data that does not require manipulation of the data before it can be queried. From Chapter 2. Components temporal data. temporal data management taxonomy reconstructable temporal data Description any method of managing temporal data that requires manipulation of the data before it can be queried. From Chapter 2. Components temporal data. temporal data management taxonomy state temporal data Description any method of managing queryable temporal data that keeps track of the states of things as they change over time. Comments As an object changes from one state to the next we store the before-image of the current state and update a copy of that state not the original. The update becomes the new current state of the object. When managing time using state data what we record are not transactions but rather the results of transactions the rows resulting from inserts and logical deletes and the rows representing both a before- and an after-image of every update. From Chapter 2. Components state temporal data management taxonomy queryable temporal data . temporal data management taxonomy temporal data best practices Description as described in Chapter 4 best practices in managing temporal data concern themselves with versioning . with keeping track of the changes to objects of interest by recording the states which those objects pass through as they change. Components object state temporal data versioning. temporal data management taxonomy temporal data management Description any method of managing temporal data at the table and row level by means of explicit temporal schemas and constraints on the instances of those schemas. Comments Thus for example data warehouses and data marts are not part of this taxonomy because they are methods of managing temporal data at the database level. Components temporal data. temporal data management .

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