Programmer Group

1. Preface Seckill is essentially a short-term, sudden and high concurrent access problem. Its business features are as follows: Triggered by timing, the flow suddenly increases in an instant Only some of the requests for seckill are successful Seckill products are often limited in quantity, not over ...

Transaction Delivery Properties for the 200202-SpringBoot series of tutorials For mysql, there may be several main points of knowledge about transactions at the isolation level; in the Spring system, there is also a transfer property of knowledge point transactions that is equally important when using transactions. This article will focus on ...

[Problem Description] Queries_per_sec (QPS) is two important performance counter metrics for databases.We often require development to inform this parameter to evaluate a load on the database.The following code connects to the server to make a simple query: using (MySqlConnection conn = new MySqlConnection()) { conn.ConnectionString = "Database ...

background The programmatic transaction management based on PlatformTransactionManater implemented in the previous article belongs to a very low-level encapsulation. In fact, the original JDBC transaction operation is encapsulated as an interface and then implemented by a specific implementation class ...

One way try....catch...finally, catch and handle exceptions in catch       Mode two Set the default global exception handler.   In case of any abnormality, throw upward one by one, In this process, if the exception is caught and handled by catch, it will be OK; If there is no corresponding catch to catch and handle exceptions, they will be fin ...

Python 3 natural language processing (5) - preprocessing Note: please contact the blogger, or pay attention to the WeChat public number "citation space". Otherwise, the plagiarism will be reported! 1. participle When a document or a long string needs to be processed, the first thing you need ...

Hyperledger Fabric is one of the most popular blockchain development frameworks. It has unique positioning and some distinctive features, such as licensing architecture, pluggable components, channels supporting private transactions, modularity and scalability, so it is suitable for the development of enterprise alliance chain applications. In ...

In the process of configuration, initiation and recovery of Oracle database backup, many Oracle database commands are needed. In this chapter, I will sort out the commands for your reference. Oracle user and instance related commands Linux/Unix platform # ps -ef | grep [p]mon orauxdb 18751 1 ...

Next, we will process the database to see if the processing of sequencing data from the reference database can improve the accuracy of species annotation. It is predicted that the classification results of species can not be improved obviously. Maybe it is because of the defect of sequence length. Even ...

@Transactional attribute The @Transactional annotation can only be applied to public modifiers and will not work with other modifiers without error. @Transactional ly is typically added to an implementation class or implementation class method, not to an interface or interface method. @Transaction ...