Indexes. They're one of the most powerful and misunderstood aspects of SQL performance. In this post we'll look at the purpose of an index, how to create and choose choose your index type. Then finish with a discussion of how to decide what to index and
The insert statement adds a new row or rows in a table in theOracle database. We generally use it after we have created a table in the database. One important point to remember is that while inserting records into a table, we must provide a value for every NOT NULL value. Let us lo...
If you want to hide these working columns from the final output, you need to list all the columns out again in the final select. Provided you've listed all the necessary columns in the subquery, you've avoided the performance and maintenance issuesselect *brings. In these cases it'd be ...
Create an Oracle Data Guard Broker configuration for the primary database. You use thedgmgrlcommand to create the Oracle Data Guard Broker configuration. You need to know the name of the Oracle Data Guard Broker configuration that you want to create, the name of the primary database, and the...
DWObject.CurrentImageIndexInBuffer, endPoint, "scanned.jpg", OnEmptyResponse, OnServerReturnedSomething); }, } Create a Python Flask app as the backend HTTP server to receive and serve the scanned documents. In order to access it from APEX via an intranet IP, we have to enable CORS and ...
Write the backend code. Using your preferred programming language and framework, create the backend code that will power your API. This can be an iterative process that includes other collaborators. Test the backend code. Oracle’s API development service includes various tools to test both locally...
Before Oracle 12c, we don’t have a direct method of generating an AUTO_INCREMENT column in a table. We need to use the combination of Sequences and
Oracle Database - Enterprise Edition - Version 11.2.0.3 and later: How to calculate the number of columns in a create index statement giving ORA-01793: Maximum Numbe
Because a block device’s total size is fixed and easy to index, processes have random access to any block in the device with the help of the kernel. 程序以固定的块大小从块设备中访问数据。 上述示例中的sda1是一个磁盘设备,也是一种块设备。 磁盘可以被分割成数据块。 由于块设备的总大小是...
Will there be access to advanced cloud analytics tools? Can the cloud service provider scale instantly to handle an increased number of workloads? Will the cloud service provider be able to store, manage, and analyze the data in the cloud? Can the cloud service provider show tangible efficiencie...