TAILIEUCHUNG - Microsoft SQL Server 2008 R2 Unleashed- P64

Microsoft SQL Server 2008 R2 Unleashed- P64:SQL Server 2005 provided a number of significant new features and enhancements over what was available in SQL Server 2000. This is not too surprising considering there was a five-year gap between these major SQL Server 2008 is not as much of a quantum leap forward from SQL Server 2005 | 574 CHAPTER 19 Replication Snapshot replication A complete copy of the publication is sent out to all subscribers. This includes both changed and unchanged data. Merge replication All sites make changes to local data independently and then update the publisher. It is possible for conflicts to occur but they can be resolved. SQL Server Replication Types Microsoft has narrowed the field to three major types of data replication approaches within SQL Server snapshot transactional and merge. Each replication type applies to only a single publication. However it is possible to have multiple replication types per database. Snapshot Replication Snapshot replication makes an image of all the tables in a publication at a single moment in time and then moves that entire image to the subscribers. Little overhead on the server is incurred because snapshot replication does not track data modifications as the other forms of replication do. It is possible however for snapshot replication to require large amounts of network bandwidth especially if the articles being replicated are large. Snapshot replication is the easiest form of replication to set up and is used primarily with smaller tables for which subscribers do not have to perform updates. An example of this might be a phone list that is to be replicated to many subscribers. This phone list is not considered to be critical data and the frequency of it being refreshed is more than enough to satisfy all its users. The primary agents used for snapshot replication are the snapshot agent and distribution agent. The snapshot agent creates files that contain the schema of the publication and the data. The files are temporarily stored in the snapshot folder of the distribution server and then the distribution jobs are recorded in the distribution database. The distribution agent is responsible for moving the schema and data from the distributor to the subscribers. A few other agents are also used they deal with other needed tasks .

TỪ KHÓA LIÊN QUAN
TAILIEUCHUNG - Chia sẻ tài liệu không giới hạn
Địa chỉ : 444 Hoang Hoa Tham, Hanoi, Viet Nam
Website : tailieuchung.com
Email : tailieuchung20@gmail.com
Tailieuchung.com là thư viện tài liệu trực tuyến, nơi chia sẽ trao đổi hàng triệu tài liệu như luận văn đồ án, sách, giáo trình, đề thi.
Chúng tôi không chịu trách nhiệm liên quan đến các vấn đề bản quyền nội dung tài liệu được thành viên tự nguyện đăng tải lên, nếu phát hiện thấy tài liệu xấu hoặc tài liệu có bản quyền xin hãy email cho chúng tôi.
Đã phát hiện trình chặn quảng cáo AdBlock
Trang web này phụ thuộc vào doanh thu từ số lần hiển thị quảng cáo để tồn tại. Vui lòng tắt trình chặn quảng cáo của bạn hoặc tạm dừng tính năng chặn quảng cáo cho trang web này.