{"id":14672,"date":"2024-03-15T09:43:22","date_gmt":"2024-03-15T09:43:22","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/what-is-the-rule-for-generating-rowids-in-oracle\/"},"modified":"2025-08-06T11:53:30","modified_gmt":"2025-08-06T11:53:30","slug":"what-is-the-rule-for-generating-rowids-in-oracle","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/what-is-the-rule-for-generating-rowids-in-oracle\/","title":{"rendered":"Oracle ROWID Generation Explained"},"content":{"rendered":"

In Oracle database, ROWID is a unique identifier used by Oracle to identify each row in a database table. It consists of three parts.<\/p>\n

    \n
  1. Datafile Identifier: It represents the identifier of the data file in which the row resides. In an Oracle database, each data file has a unique identifier.<\/li>\n
  2. Block Identifier: It signifies the identifier of the data block in which the row is located. A data block is the fundamental unit for storing data in an Oracle database.<\/li>\n
  3. Row Identifier: It indicates the position of a row within a data block by using a numerical value.<\/li>\n<\/ol>\n

    When Oracle database needs to reference a row, it can use ROWID to locate the row’s position. ROWID can be obtained in the following way:<\/p>\n

      \n
    1. You can use the ROWID pseudocolumn in a SELECT statement to retrieve the ROWID of a row. For example:<\/li>\n
    2. Choose the ROWID, column1, and column2 from the table_name based on the specified condition.<\/li>\n
    3. You can use the ROWID pseudo-column in INSERT, UPDATE, and DELETE statements to manipulate specific rows. For example:<\/li>\n
    4. Add data into the table named table_name where the ROWID is equal to ‘ROWID_value’ and the values for column1 and column2 are value1 and value2, respectively.<\/li>\n<\/ol>\n

      It is important to note that ROWID is a physical address that is closely related to the structure and physical storage of a table. Therefore, in some cases, ROWID may change, such as when the table is rebuilt or data is migrated. It is important to be aware of these potential changes when using ROWID.<\/p>\n","protected":false},"excerpt":{"rendered":"

      In Oracle database, ROWID is a unique identifier used by Oracle to identify each row in a database table. It consists of three parts. Datafile Identifier: It represents the identifier of the data file in which the row resides. In an Oracle database, each data file has a unique identifier. Block Identifier: It signifies the […]<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[19824,19825,813,19803,19823],"class_list":["post-14672","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-database-identifiers","tag-oracle-data-block","tag-oracle-database","tag-oracle-rowid","tag-rowid-structure"],"yoast_head":"\nOracle ROWID Generation Explained - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Discover how Oracle generates unique ROWIDs: learn the datafile, block, and row identifier structure.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/blog\/what-is-the-rule-for-generating-rowids-in-oracle\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Oracle ROWID Generation Explained\" \/>\n<meta property=\"og:description\" content=\"Discover how Oracle generates unique ROWIDs: learn the datafile, block, and row identifier structure.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/blog\/what-is-the-rule-for-generating-rowids-in-oracle\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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