Using transactions in databases is often necessary and useful. If several database operations depend on each other, then it was both easier and prettier to make use of transactions. This article shows how the Zend\Db makes database transactions easy to use.
The primary index is essential in databases. In this article, we present the main characteristics of the primary index along with its problems and solutions. A primary index physically orders the records on the secondary storage device to speed up the retrieval of data records. The index is sparse or non-dense because it only contains a block pointer for each block in the data file.