TAILIEUCHUNG - OCA /OCP Oracle Database 11g A ll-in-One Exam Guide- P81

OCA /OCP Oracle Database 11g A ll-in-One Exam Guide- P81: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 756 128KB stripes in what is known as fine striping. Thus there will be lower latency in satisfying the typically small requests for reads and writes of these file types because the one small request can be split up into several even smaller requests directed to each disk in the group in parallel. The syntax for creating and managing ASM files is exactly the same as for file system-based files. All ASM files are created and managed by the RDBMS instance using the usual commands. The only difference is in the filename when creating a database file you specify only the name of the disk group to which the file should be directed and ASM will generate the actual filename and manage the physical locations. There is a one-to-one relationship between a database file and an ASM file. If your database has 200 datafiles using conventional file system storage it will still have 200 datafiles when you convert to ASM. But they will no longer exist as individual files that you can see with operating system utilities. In fact normal operating system commands will not be able to see anything at all within the ASM disks because they are not formatted with a file system. This means that the only way to get at ASM files is through Oracle utilities. This is not a problem at all but it does mean that you must use RMAN to back up your ASM datafiles archive logs and controlfiles. ASM files can coexist with files stored within file systems. There is no reason why a tablespace should not consist of one ASM file and one conventional file but there would be no purpose in such an arrangement. However this does mean that it is possible to migrate a database to ASM over time by moving the various files whenever convenient. Because you cannot write to an ASM disk group with any operating system tools for datafiles this move must be accomplished with RMAN through a backup and restore operation. To move online logs create new members in an ASM disk

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