TAILIEUCHUNG - OCA /OCP Oracle Database 11g A ll-in-One Exam Guide- P24

OCA /OCP Oracle Database 11g A ll-in-One Exam Guide- P24:There is an ever increasing demand for staff with IT industry certification. The benefits to employers are significant—they can be certain that staff have a certain level of competence—and the benefits to the individuals, in terms of demand for their services, are equally great. Many employers are now requiring technical staff to have certifications, and many IT purchasers will not buy from firms that do not have certified staff. | OCA OCP Oracle Database 11g All-in-One Exam Guide 186 and DBA_TEMP_FILES whereas datafiles are listed in V DATAFILE and DBA_DATA_ FILES. Also note that the V views and the DBA views give different information. As the query shows you can query V TABLESPACE to find if a tablespace is a bigfile table and V TEMPFILE or V DATAFILE to find how big a file was at creation time. This information is not shown in the DBA views. However the DBA views give the detail of extent management and segment space management. The different information available in the views is because some information is stored only in the controlfile and therefore visible only in V views and some is stored only in the data dictionary and therefore visible only in DBA views . Other information is duplicated. Altering Tablespaces The changes made to tablespaces after creation are commonly Renaming Taking online and offline Flagging as read-write or read only Resizing Changing alert thresholds Rename a Tablespace and Its Datafiles The syntax is ALTER TABLESPACE tablespaceoldname RENAME TO tablespacenewname This is very simple but can cause problems later. Many sites rely on naming conventions to relate tablespaces to their datafiles. All the examples in this chapter do just that they embed the name of the tablespace in the name of the datafiles. Oracle doesn t care internally it maintains the relationships by using the tablespace number and the datafile or tempfile number. These are visible as the columns V TABLESPACE .TS and V . If your site does rely on naming conventions then it will be necessary to rename the files as well. A tablespace can be renamed while it is in use but to rename a datafile the datafiles must be offline. This is because the file must be renamed at the operating system level as well as within the Oracle environment and this can t be done if the file is open all the file handles would become invalid. Figure 5-8 demonstrates an example of the entire process using the .

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.