SQL Server and other database management systems have their own mechanisms for dealing with deadlocks. However, in practice, after a deadlock is resolved, how to determine the cause of the deadlock problem and how to deal with the follow-up (deadlock does not occur again) should be concerned.

There are two ways to display the details of an SQL statement: on the SQL Statements TAB, click Table/View/Procedure Nam in the left column

In the process of building the warehouse, we gradually draw lessons from the platform development experience, and often introduce the concept of CI/CD, which requires the function of static code scanning to identify dangerous operations such as database deletion, table deletion and table modification in advance. In addition, for Hive and other computing engines, you can dynamically obtain blood through Hook, but

Most results of DBCC command execution are in tabular form. Such as DBCC useroptions; Most of the results can be tabled using the with TABLERESULTS parameters, but some are in text format, such as DBCC CHECKDB

The SQL SERVER Date DateDiff function returns the time between two dates. DATEDIFF(datepart,startdate,enddate) DATEDIFF(MONTH,startdat

This article is mainly a summary of the basics of subqueries. Why use subqueries? You can avoid the need to split operations into multiple steps in a query solution and store intermediate query results in variables.

This article has been authorized by the author Liu Chao netease cloud community. Welcome to visit netease Cloud Community to learn more about Netease's technical product operation experience. The database is always the most critical part of the application. At the same time, the more to the high concurrency stage, the database often becomes the bottleneck. If the database table and index are not well designed at the beginning, the later database will be horizontally expanded, and the sub-database sub-table will encounter difficulties. For Internet companies, generally...

Sqlite3 supports almost all versions of NodeJS and can also be integrated with NWJS. In addition to installing the NPM package for SQlite3, the most important thing is also installing the SQLite database, because SQLite is an embedded database, embedded in the client. Sqlite3 uses node-pre-gyp for each...

The concept of dynamic table was put forward by the community for a long time, but not all of them have been realized. All the descriptions below are based on existing plans and proposals, which may be different from the later realization. Dynamic tables change over time; Similar to static Batch table can be...

Chapter 1 Introduction to SQL Performance Optimization InterSystems SQL supports several features to optimize SQL performance for the InterSystems IRIS® data platform. Table definition optimization for SQL performance is fundamentally dependent on good data architecture. Divide the data into multiple