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The system is not active recently and has not been upgraded. Therefore, you can optimize the entire ETL system on a stable basis. Top 10 cost time jobs are listed on a daily basis for analysis. The top1 costtime job uses the window functions
Window FunctionOracle provides analysis functions starting from 8.1.6. The analysis function is used to calculate a group-based aggregate value. The difference between the analysis function and the aggregate function is that multiple rows are
Oracle provides analytic functions starting from 8.1.6, which are used to calculate some sort of aggregate value based on a group, which differs from aggregate functions in that multiple rows are returned for each group, whereas aggregate functions
Paste to the old zizhu's website: http://www.laozizhu.com/view-Oracle%E5%88%86%E6%9E%90%E5%87%BD%E6%95%B0%E8%AF%A6%E8%A7%A3-20279.htm (he will not complain to me, not allowed to repost the article) It is designed by Oracle analysis functions for
--- Start DB2 online analysis and processing can be described very well. This function is especially suitable for various statistical queries. These queries are difficult to implement with common SQL statements, or are not implemented at all. First,
one, element:: Declares an element. 1, declaration method: abstract = Boolean:false Block = (#all | List of (Extension | restriction | substitution)) Default = String Final = (#all | List of (Extension | restriction)) Fixed = string Form = (
Thinking logic of computer programs (78) and thinking 78 In the previous section, we initially discussed the task execution service in Java and package. In reality, the main implementation mechanism of the task execution service is the thread pool.
The thread pool resolves two different issues: because of the reduced overhead of each task invocation, they typically provide enhanced performance when performing a large number of asynchronous tasks, and can also provide methods for binding and
blocking queues in Java 1. What is a blocking queue? A blocking queue (Blockingqueue) is a queue that supports two additional operations. The two additional actions are: When the queue is empty, the thread that gets the element waits for the
1. What is a blocking queue? A blocking queue (Blockingqueue) is a queue that supports two additional operations. The two additional actions are that when the queue is empty, the thread that gets the element waits for the queue to become non-null.