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Counseling Astrology Advice | Tarot Advice | Parenting Dating Advice | Love Advice | Divorce Advice Legal Advice | Debt Advice | Career Advice Public database link is created for the special user group PUBLIC. A public database link can be used when any user in the associated database specifies a global object name in a SQL statement or object definition. 32. Explain network database link? Network database link is created and managed by a network domain service. A network database link can be used when any user of any database in the network specifies a global object name in a SQL statement or object definition. 33. Explain data block? Oracle database's data is stored in data blocks. One data block corresponds to a specific number of bytes of physical database space on disk. 34. How to define data block size? A data block size is specified for each Oracle database when the database is created. A database users and allocated free database space in Oracle data blocks. Block size is specified in init.ora file and cannot be changed latter. 35. Explain row chaining? In circumstances, all of the data for a row in a table may not be able to fit in the same data block. When this occurs, the data for the row is stored in a chain of data block (one or more) reserved for that segment. 36. Explain an extent? An extent is a specific number of contiguous data blocks, obtained in a single allocation and used to store a specific type of information. 37. Explain a segment? A segment is a set of extents allocated for a certain logical structure. 38. Explain the different types of segments? Data segment, index segment, rollback segment and temporary segment. 39. Explain a data segment? Each non-clustered table has a data segment. All of the table's data is stored in the extents of its data segment. Each cluster has a data segment. The data of every table in the cluster is stored in the cluster's data segment. 40. Explain an index segment? Each index has an index segment that stores all of its data. |
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