search
HomeDatabaseMysql TutorialOracle创建/删除、导入/导出等命令总结

Oracle创建/删除、导入/导出等命令总结

Jun 07, 2016 pm 04:22 PM
oraclecreatedeleteOrderimportExportSummarize

//创建临时表空间 create temporary tablespace zfmi_temp tempfile 'D:oracleoradatazfmizfmi_temp.dbf' size 32m autoextend on next 32m maxsize 2048m extent management local; //tempfile参数必须有 //创建数据表空间 create tablespace zfmi logging

   //创建临时表空间

  create temporary tablespace zfmi_temp

  tempfile 'D:oracleoradatazfmizfmi_temp.dbf'

  size 32m

  autoextend on

  next 32m maxsize 2048m

  extent management local;

  //tempfile参数必须有

  //创建数据表空间

  create tablespace zfmi

  logging

  datafile 'D:oracleoradatazfmizfmi.dbf'

  size 100m

  autoextend on

  next 32m maxsize 2048m

  extent management local;

  //datafile参数必须有

  //删除用户以及用户所有的对象

  drop user zfmi cascade;

  //cascade参数是级联删除该用户所有对象,经常遇到如用户有对象而未加此参数则用户删不了的问题,所以习惯性的加此参数

  //删除表空间

  前提:删除表空间之前要确认该表空间没有被其他用户使用之后再做删除

  drop tablespace zfmi including contents and datafiles cascade onstraints;

  //including contents 删除表空间中的内容,如果删除表空间之前表空间中有内容,而未加此参数,表空间删不掉,所以习惯性的加此参数

  //including datafiles 删除表空间中的数据文件

  //cascade constraints 同时删除tablespace中表的外键参照

  如果删除表空间之前删除了表空间文件,解决办法:

  如果在清除表空间之前,,先删除了表空间对应的数据文件,会造成数据库无法正常启动和关闭。

  可使用如下方法恢复(此方法已经在oracle9i中验证通过):

  下面的过程中,filename是已经被删除的数据文件,如果有多个,则需要多次执行;tablespace_name是相应的表空间的名称。

  $ sqlplus /nolog

  SQL> conn / as sysdba;

  如果数据库已经启动,则需要先执行下面这行:

  SQL> shutdown abort

  SQL> startup mount

  SQL> alter database datafile 'filename' offline drop;

  SQL> alter database open;

  SQL> drop tablespace tablespace_name including contents;

  //创建用户并指定表空间

  create user zfmi identified by zfmi

  default tablespace zfmi temporary tablespace zfmi_temp;

  //identified by 参数必须有

  //授予message用户DBA角色的所有权限

  GRANT DBA TO zfmi;

  //给用户授予权限

Statement
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
MySQL: BLOB and other no-sql storage, what are the differences?MySQL: BLOB and other no-sql storage, what are the differences?May 13, 2025 am 12:14 AM

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

MySQL Add User: Syntax, Options, and Security Best PracticesMySQL Add User: Syntax, Options, and Security Best PracticesMay 13, 2025 am 12:12 AM

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

MySQL: How to avoid String Data Types common mistakes?MySQL: How to avoid String Data Types common mistakes?May 13, 2025 am 12:09 AM

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

MySQL: String Data Types and ENUMs?MySQL: String Data Types and ENUMs?May 13, 2025 am 12:05 AM

MySQloffersechar, Varchar, text, Anddenumforstringdata.usecharforfixed-Lengthstrings, VarcharerForvariable-Length, text forlarger text, AndenumforenforcingdataAntegritywithaetofvalues.

MySQL BLOB: how to optimize BLOBs requestsMySQL BLOB: how to optimize BLOBs requestsMay 13, 2025 am 12:03 AM

Optimizing MySQLBLOB requests can be done through the following strategies: 1. Reduce the frequency of BLOB query, use independent requests or delay loading; 2. Select the appropriate BLOB type (such as TINYBLOB); 3. Separate the BLOB data into separate tables; 4. Compress the BLOB data at the application layer; 5. Index the BLOB metadata. These methods can effectively improve performance by combining monitoring, caching and data sharding in actual applications.

Adding Users to MySQL: The Complete TutorialAdding Users to MySQL: The Complete TutorialMay 12, 2025 am 12:14 AM

Mastering the method of adding MySQL users is crucial for database administrators and developers because it ensures the security and access control of the database. 1) Create a new user using the CREATEUSER command, 2) Assign permissions through the GRANT command, 3) Use FLUSHPRIVILEGES to ensure permissions take effect, 4) Regularly audit and clean user accounts to maintain performance and security.

Mastering MySQL String Data Types: VARCHAR vs. TEXT vs. CHARMastering MySQL String Data Types: VARCHAR vs. TEXT vs. CHARMay 12, 2025 am 12:12 AM

ChooseCHARforfixed-lengthdata,VARCHARforvariable-lengthdata,andTEXTforlargetextfields.1)CHARisefficientforconsistent-lengthdatalikecodes.2)VARCHARsuitsvariable-lengthdatalikenames,balancingflexibilityandperformance.3)TEXTisidealforlargetextslikeartic

MySQL: String Data Types and Indexing: Best PracticesMySQL: String Data Types and Indexing: Best PracticesMay 12, 2025 am 12:11 AM

Best practices for handling string data types and indexes in MySQL include: 1) Selecting the appropriate string type, such as CHAR for fixed length, VARCHAR for variable length, and TEXT for large text; 2) Be cautious in indexing, avoid over-indexing, and create indexes for common queries; 3) Use prefix indexes and full-text indexes to optimize long string searches; 4) Regularly monitor and optimize indexes to keep indexes small and efficient. Through these methods, we can balance read and write performance and improve database efficiency.

See all articles

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

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

Hot Article

Hot Tools

VSCode Windows 64-bit Download

VSCode Windows 64-bit Download

A free and powerful IDE editor launched by Microsoft

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

WebStorm Mac version

WebStorm Mac version

Useful JavaScript development tools

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

SAP NetWeaver Server Adapter for Eclipse

SAP NetWeaver Server Adapter for Eclipse

Integrate Eclipse with SAP NetWeaver application server.