首先cmd - sqlplusw 普通用户登陆:用户名:scott(普通用户名) 密码:tiger(普通用户密码) 管理员登陆:用户名:system
首先cmd - sqlplusw
普通用户登陆:用户名:scott(普通用户名) 密码:tiger(普通用户密码)
管理员登陆:用户名:system 密码:system(管理员密码)
超级管理员登陆的时候注意:用户名:sys 密码:sys as sysdba(sys 为密码)
一、忘记除SYS、SYSTEM用户之外的用户的登录密码。
使用如下语句修改用户的密码。
ALTER USER user_name IDENTIFIED BY newpass;
注意:密码不能全是数字。并且不能是数字开头。否则会出现:ORA-00988: 口令缺失或无效
二、忘记SYS用户,或者是SYSTEM用户的密码。
如果是忘记SYSTEM用户的密码,可以用SYS用户登录。然后用ALTER USER 密令
修改密码。
ALTER USER SYSTEM IDENTIFIED BY newpass;
如果是忘记SYS用户的密码,可以用SYSTEM用户登录。然后用ALTER USER 密令
修改密码。
ALTER USER SYSTEM IDENTIFIED BY newpass;
三、如果SYS,SYSTEM用户的密码都忘记或是丢失。
这一项尤其重要。
可以使用ORAPWD.EXE 工具修改密码。
开始菜单->运行->输入‘CMD’,打开命令提示符窗口,,输入如下命令:
orapwd file=D:\Oracle\product\10.2.0\db_1\database\pwdctcsys.ora
password=newpass
这个命令重新生成了数据库的密码文件。密码文件的位置在ORACLE_HOME目录下
的\database目录下。
这个密码是修改sys用户的密码。除sys和system其他用户的密码不会改变。
四、查看Oracle系统里的用户列表
select * from all_users;

MySQLviewshavelimitations:1)Theydon'tsupportallSQLoperations,restrictingdatamanipulationthroughviewswithjoinsorsubqueries.2)Theycanimpactperformance,especiallywithcomplexqueriesorlargedatasets.3)Viewsdon'tstoredata,potentiallyleadingtooutdatedinforma

ProperusermanagementinMySQLiscrucialforenhancingsecurityandensuringefficientdatabaseoperation.1)UseCREATEUSERtoaddusers,specifyingconnectionsourcewith@'localhost'or@'%'.2)GrantspecificprivilegeswithGRANT,usingleastprivilegeprincipletominimizerisks.3)

MySQLdoesn'timposeahardlimitontriggers,butpracticalfactorsdeterminetheireffectiveuse:1)Serverconfigurationimpactstriggermanagement;2)Complextriggersincreasesystemload;3)Largertablesslowtriggerperformance;4)Highconcurrencycancausetriggercontention;5)M

Yes,it'ssafetostoreBLOBdatainMySQL,butconsiderthesefactors:1)StorageSpace:BLOBscanconsumesignificantspace,potentiallyincreasingcostsandslowingperformance.2)Performance:LargerrowsizesduetoBLOBsmayslowdownqueries.3)BackupandRecovery:Theseprocessescanbe

Adding MySQL users through the PHP web interface can use MySQLi extensions. The steps are as follows: 1. Connect to the MySQL database and use the MySQLi extension. 2. Create a user, use the CREATEUSER statement, and use the PASSWORD() function to encrypt the password. 3. Prevent SQL injection and use the mysqli_real_escape_string() function to process user input. 4. Assign permissions to new users and use the GRANT statement.

MySQL'sBLOBissuitableforstoringbinarydatawithinarelationaldatabase,whileNoSQLoptionslikeMongoDB,Redis,andCassandraofferflexible,scalablesolutionsforunstructureddata.BLOBissimplerbutcanslowdownperformancewithlargedata;NoSQLprovidesbetterscalabilityand

ToaddauserinMySQL,use:CREATEUSER'username'@'host'IDENTIFIEDBY'password';Here'showtodoitsecurely:1)Choosethehostcarefullytocontrolaccess.2)SetresourcelimitswithoptionslikeMAX_QUERIES_PER_HOUR.3)Usestrong,uniquepasswords.4)EnforceSSL/TLSconnectionswith

ToavoidcommonmistakeswithstringdatatypesinMySQL,understandstringtypenuances,choosetherighttype,andmanageencodingandcollationsettingseffectively.1)UseCHARforfixed-lengthstrings,VARCHARforvariable-length,andTEXT/BLOBforlargerdata.2)Setcorrectcharacters


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 English version
Recommended: Win version, supports code prompts!

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

VSCode Windows 64-bit Download
A free and powerful IDE editor launched by Microsoft

Dreamweaver Mac version
Visual web development tools

Atom editor mac version download
The most popular open source editor
