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Requirements: when developing business reports, it is necessary to read data from MySQL database, then write it to the database, and run batches using scheduled tasks. Analysis: ① considering performance; ② MySQL is not as convenient and powerful as Oracle. To sum up, thread pool is used to insert MySQL database in batch Submission Scheme. Thi ...

After learning the stored procedures and stored functions, this paper will explain how to access the stored procedures and stored functions of oracle through jdbc. 1 precondition oracle has been installed, scott users have also unlocked [the author uses oracle 11g] jdk installed and environment variables configured Proficient ...

How to restore MySQL database password Stop Mysql server Skip authorization table to start MySQL service program Reset root password (update user table record) Restart MySQL service program in normal way Password recovery instance Example 1: reset MySQL management password Stop the running MySQL service program first [root@host50 ~]# system ...

A binary search tree is locally transformed into a sorted bi-directional circular list. The left and right child pointers can be used as the precursor and successor pointers of the bidirectional circular list.To give you a better understanding of the problem, take the following binary search tree as an example: We want to transform this binary ...

This paper introduces GuassDB's Cross cluster access to remote oracle and remote MPPDB database. Due to the limited environment, docking HDFS and docking Spark functions are not listed here. I. docking with oracle Database 1. Restriction Only connection from Oracle11.2.0.1 to Oracle12.2.0.1 is supported. The Oracle-ODBC driver version is requ ...

1.Oracle batch operation My watch structure is 1.1 batch insertion 1.1.1 primary key does not use sequence insert into students(sid,sname,ssal,ssex) select 9,'Zhang San',3000,'male' from dual union all select 10,'Li Si',4000,'male' from dual union all select 11,'Xiaohong',5000,'female' from dual ...

DNFS is a new feature introduced by Oracle 11g to improve the IO performance of the system with NFS. Compared with system level NFS, DNFS reduces the consumption of network and IO transmission. The reasons for the low IO capacity of normal NFS are:1. Low efficiency data transmission, multi link implementation is difficult;2. The system's RPC s ...

Object oriented: objects, messages, classes, and inheritance, Language basis: variables, arrays, data types, operators, and control flow. Classes and objects statement Interface Number and character: number and String objects generic paradigm package II. Language foundation: variables: bas ...

1. Stop mysql service first ​[root@CentOS ~]# ps -ef | grep mysql root 5365 1 0 15:47 pts/0 00:00:00 /bin/sh /usr/local/mysql/bin/mysqld_safe --datadir=/usr/local/mysql/data --pid-file=/usr/local/mysql/data/CentOS.pid mysql 5452 5365 4 15:47 pts/0 00:00:00 /usr/local/mysql/bin/mysqld --basedir=/usr/local/mysql --d ...

Because of the work requirements, a large amount of data needs to be inserted into ORACLE data, and then the manual management of transaction opening is selected to insert a large amount of data. However, a pit is encountered here. Before the transaction management of mysql was opened to insert data, copying mysql is a bit impractical. Only 299 ...