Oracle中scheduler的管理主要是通过dbms_scheduler来执行。开始前的工作:创建一个用户:create user sched identified by oracl
Oracle中scheduler的管理主要是通过dbms_scheduler来执行。
开始前的工作:
创建一个用户:create user sched identified by oracle;
grant create session to sched;
grant scheduler_admin to sched;
使用用户hr登录数据库执行下面操作:
create table sched_test(dt date,str varchar2(32));
create or replace procedure p_scheduler_test
is
begin
insert into hr.sched_test values(sysdate,'scheduler job test!');
commit;
end;
/
把存储过程p_scheduler_test 执行权限赋予用户sched
grant execute on p_scheduler_test to sched;
创建一个jobs
BEGIN
DBMS_SCHEDULER.CREATE_JOB (
job_name => 'INSERT_SCHED_TEST',
job_type => 'STORED_PROCEDURE',
job_action => 'HR.P_SCHEDULER_TEST', //这里必须加上用户模式的限制
start_date => sysdate,
repeat_interval => 'FREQ=MINUTELY;INTERVAL=1');
END;
/
可以通过表user_scheduler_jobs查看作业属性,,
查看SCHEDULER管理的JOB,可以通过USER_SCHEDULER_JOB_LOG和USER_SCHEDULER_JOB_RUN_DETAILS两个视图中查询。
执行命令:exec dbms_scheduler.enable('INSERT_SCHED_TEST'); 使作业生效
执行命令:exec dbms_scheduler.disable('INSERT_SCHED_TEST'); 使作业失效
执行命令:exec dbms_scheduler.set_attribute('job_name','job_attribute','new_value'); 更改作业相关属性。
手工执行作业:exec dbms_scheduler.run_job('job_name');
job、program和schedule的关系
program:指定要做的具体内容,也就是做什么
schedule:指定作业执行的时间和频率,也就是怎么做
job:指定要执行作业,就是做

How to effectively monitor MySQL performance? Use tools such as mysqladmin, SHOWGLOBALSTATUS, PerconaMonitoring and Management (PMM), and MySQL EnterpriseMonitor. 1. Use mysqladmin to view the number of connections. 2. Use SHOWGLOBALSTATUS to view the query number. 3.PMM provides detailed performance data and graphical interface. 4.MySQLEnterpriseMonitor provides rich monitoring functions and alarm mechanisms.

The difference between MySQL and SQLServer is: 1) MySQL is open source and suitable for web and embedded systems, 2) SQLServer is a commercial product of Microsoft and is suitable for enterprise-level applications. There are significant differences between the two in storage engine, performance optimization and application scenarios. When choosing, you need to consider project size and future scalability.

In enterprise-level application scenarios that require high availability, advanced security and good integration, SQLServer should be chosen instead of MySQL. 1) SQLServer provides enterprise-level features such as high availability and advanced security. 2) It is closely integrated with Microsoft ecosystems such as VisualStudio and PowerBI. 3) SQLServer performs excellent in performance optimization and supports memory-optimized tables and column storage indexes.

MySQLmanagescharactersetsandcollationsbyusingUTF-8asthedefault,allowingconfigurationatdatabase,table,andcolumnlevels,andrequiringcarefulalignmenttoavoidmismatches.1)Setdefaultcharactersetandcollationforadatabase.2)Configurecharactersetandcollationfor

A MySQL trigger is an automatically executed stored procedure associated with a table that is used to perform a series of operations when a specific data operation is performed. 1) Trigger definition and function: used for data verification, logging, etc. 2) Working principle: It is divided into BEFORE and AFTER, and supports row-level triggering. 3) Example of use: Can be used to record salary changes or update inventory. 4) Debugging skills: Use SHOWTRIGGERS and SHOWCREATETRIGGER commands. 5) Performance optimization: Avoid complex operations, use indexes, and manage transactions.

The steps to create and manage user accounts in MySQL are as follows: 1. Create a user: Use CREATEUSER'newuser'@'localhost'IDENTIFIEDBY'password'; 2. Assign permissions: Use GRANTSELECT, INSERT, UPDATEONmydatabase.TO'newuser'@'localhost'; 3. Fix permission error: Use REVOKEALLPRIVILEGESONmydatabase.FROM'newuser'@'localhost'; then reassign permissions; 4. Optimization permissions: Use SHOWGRA

MySQL is suitable for rapid development and small and medium-sized applications, while Oracle is suitable for large enterprises and high availability needs. 1) MySQL is open source and easy to use, suitable for web applications and small and medium-sized enterprises. 2) Oracle is powerful and suitable for large enterprises and government agencies. 3) MySQL supports a variety of storage engines, and Oracle provides rich enterprise-level functions.

The disadvantages of MySQL compared to other relational databases include: 1. Performance issues: You may encounter bottlenecks when processing large-scale data, and PostgreSQL performs better in complex queries and big data processing. 2. Scalability: The horizontal scaling ability is not as good as Google Spanner and Amazon Aurora. 3. Functional limitations: Not as good as PostgreSQL and Oracle in advanced functions, some functions require more custom code and maintenance.


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Safe Exam Browser
Safe Exam Browser is a secure browser environment for taking online exams securely. This software turns any computer into a secure workstation. It controls access to any utility and prevents students from using unauthorized resources.

Atom editor mac version download
The most popular open source editor

EditPlus Chinese cracked version
Small size, syntax highlighting, does not support code prompt function

SecLists
SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.