| they have common characteristics and share a common CA |
| EVA log. |
| See also copy set. |
database server | A computer with a large database stored on it, such as the SAP |
| R/3 or Microsoft SQL database. A server has a database that |
| can be accessed by clients. |
Dbobject | (Informix Server specific term) An Informix Server physical |
| database object. It can be a blobspace, dbspace, or logical |
| log file. |
DC directory | The Detail Catalog (DC) directory contains DC binary files, |
| which store information about file versions. It represents the |
| DCBF part of the IDB, which occupies approximately 80% of |
| the IDB. The default DC directory is called the dcbf directory |
| and is located on the Cell Manager in the directory |
| Data_Protector_program_data\db40 (Windows Server |
| 2008), Data_Protector_home\db40 (other Windows |
| systems), or /var/opt/omni/server/db40 (UNIX systems). |
| You can create more DC directories and use a custom location. |
| Up to 50 DC directories are supported per cell. The default |
| maximum size of a DC directory is 16 GB. |
DCBF | The Detail Catalog Binary Files (DCBF) part of the IDB stores |
| information about file versions and attributes. It occupies |
| approximately 80% of the IDB. One DC binary file is created |
| for each Data Protector medium used for backup. Its maximum |
| size is limited by the file system settings. |
delta backup | A delta backup is a backup containing all the changes made |
| to the database from the last backup of any type. |
| See also backup types. |
device | A physical unit which contains either just a drive or a more |
| complex unit such as a library. |
device chain | A device chain consists of several standalone devices configured |
| for sequential use. When a medium in one device gets full, the |
| backup automatically continues on a medium in the next device |
| in the device chain. |
device group | (EMC Symmetrix specific term) A logical unit representing several |
| EMC Symmetrix devices. A device cannot belong to more than |
Concepts guide | 357 |