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spring integrates mytabis Is to use the function of mybatis in the spring architecture It is equal to the mybatis tar package imported from the code written in non spring architecture to do the operation of the core configuration file, mapping configuration file and dynamic proxy interface of mybatis. Then there are operations such as dao, se ...

Dameng database audit function preface Audit mechanism is one of the important parts of security management in DM database management system. DM database not only provides data security protection measures, but also provides post audit supervision of daily events. DM has a flexible audit subsystem, which can record system level events, in ...

Principle of master-slave replication The Master records the data changes in the binary log, that is, the file specified in the configuration file log bin, These records are called binary log eventsSlave reads binary log events in the Master through I/O threads and writes them to its relay logSlave redoes the events in the relay log and execut ...

1. What is a window function? Window functions are also analysis functions. Oracle from 8.1 6 start to provide window function, which is used to calculate some aggregate value based on group, The window function specifies the data window size of the analysis function. The data window size may change with the change of rows. Unlike aggregat ...

1. Introduction MPP backup is to configure a set of real-time backup systems for each MPP node on the basis of MPP cluster. These real-time backup systems together constitute the MPP backup system. The MPP backup system consists of several daemon groups. Each daemon group is a relatively independent real-time backup system. It has the basic fu ...

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1, Multi table query multi-table query   -- merge union   -- intersection intersect   -- subtraction minus The INTERSECT operator returns only the common rows of the two queries For example: SELECT orderno FROM order_master INTERSECT SELECT orderno FROM order_detail; The MINUS operator returns rows that appear in the sec ...

Introduction to ElasticSearch and its deployment, principle and use Chapter 1: introduction to elastic search Elasticsearch is a Lucene based search server. It provides a distributed multi-user full-text search engine based on RESTful web interface. Elasticsearch is developed in Java and released as an open source under the Apache license ter ...

objective Use SQL language to create and delete the database; Create, delete and update basic tables requirement In MySql Workbench, CREATE and DROP commands in SQL language are used to CREATE and delete databases.In MySql Workbench, CREATE, ALTER and DROP commands in SQL language are used to CREATE, update and delete basic tables, and t ...

SQL master: add, modify, delete and query four sentence patterns SQL statement: a general standard for structured query statements in relational databases. Relational database (table): Mysql, Oracle, DB2, SqlServer, etc. (1) INSERT add statement (1.1) insert all fields Note: the added data must be consistent with the order, number and type ...