Oracle Employ And Manipulate Users And Roles - 1253 Words

Oracle DBAs employ and manipulate users and roles, as well as various other objects on a daily basis. They do not belong to a schema similar to other objects, including profiles and tablespaces. Users and roles access schema objects like tables, views, synonyms, and indexes. Even novice DBAs possess a reasonable awareness of working with tables including querying, updating, reading, and deleting data from them. Because tables can easily expand in row numbers, performance will inevitably suffer. An adept DBA should retain a fundamental expertise of indexes to alleviate these performance issues. Much like the index of a book, a database index speeds up table searches by adopting pointers to rows of data in contrast to performing full table scans to locate a minute amount of data. An index is a data structure (most commonly a B- tree) that stores the values for a specific column in a table. The B-tree index is the prevailing index and takes advantage of an efficient algorithm for searching columns of high cardinality. This type of search is performed in logarithmic time which exponentially decreases the time to execute a search. Fig 2 illustrates a B-tree index and how it provides more granular levels of information at each level. An index is constructed on the last name column of a table. Oracle uses ‘Miller’ as the root node and divides any last names that are alphabetically less than Miller on the left child node and any last names greater on the right side. The next levelShow MoreRelatedEvolution of Oracle Time Machine: FlashBack Essay901 Words   |  4 Pag esof Oracle Time Machine: FlashBack â€Å"It’s gone by mistake†. We human beings are tend to make mistakes. But what happens when this mistake committed by database user. Is there any simple recycle bin concept or simple time travelling concept The answer is YES, there is. 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