Learn more. Update Based on rowid in Oracle Ask Question. Asked 5 years, 2 months ago. Active 5 years, 2 months ago. Viewed 3k times. Improve this question. Shailesh Yadav. Shailesh Yadav Shailesh Yadav 14 14 silver badges 30 30 bronze badges.
Are you sure this sql is semanticaly correct? It selects rows with geotag. Add a comment. Active Oldest Votes. Improve this answer. Justin Cave Justin Cave k 22 22 gold badges silver badges bronze badges. Hi Justin thanks for answering, I had used the query where exists for updating 70k records but it took too long to execute so i changed it to merge based on rowid.
The number of rows itself is stored somewhere in the block header See orale documentation on the block layout. With a little bit of programming knowledge and looking up the documentation on oracle database files an blocks for the exact layout of blocks, you can see how rows are stored on disk, and even reconstruct all the values the row stores for each column.
Each row contains metadata for the length of the row and the number of columns, and for each column, an indication for the type of the column and the bytesize and therafter the value. Bytesize 0 means that the column data is empty or: NULL. ROWID uniquely identifies a row within a table. The two are very different and are not interchangeable. Check out this article which explains the difference. ROWID basically allows you to have two rows with the exact same data.
While, you typically want your Primary Key to be a little more meaningful than a RowID, it is just a simple way of automatically ensuring uniqueness between rows. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. ROWID oracle - any use for it? Ask Question. Asked 11 years, 8 months ago. Active 3 years, 3 months ago.
Viewed 80k times. Paolo Optional 'thank-you' note:. After modification , user submits the form. Now i have to update the corresponding record based on rowid that was fetched for that record, but i am not able to do so. Speaking as an Oracle database administrator Nothing, absolutely nothing, about a web-based application can ever justify using ROWID in this manner.
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