Oracle creates and deletes users, roles, tablespaces, imports and exports ,... Command Summary

// Create a temporary tablespace

Create temporary tablespace zfmi_temp
Tempfile 'd:/Oracle/oradata/zfmi/zfmi_temp.dbf'
Size 32 m
Autoextend on
Next 32 m maxsize 2048 m
Extent management local;

// The tempfile parameter must have

// Create a data table space

Create tablespace zfmi
Logging
Datafile 'd:/Oracle/oradata/zfmi. dbf'
Size 100 m
Autoextend on
Next 32 m maxsize 2048 m
Extent management local;

// The datafile parameter must have

// Delete the user and all objects of the user

Drop user zfmi cascade;

// The cascade parameter is used to cascade the deletion of all objects of the user. if the user has an object but does not add this parameter, the user cannot delete it. Therefore, this parameter is habitually added.

// Delete the tablespace
Prerequisites: before deleting a tablespace, make sure that the tablespace is not used by other users before deleting it.

Drop tablespace zfmi including contents and datafiles cascade onstraints;

// Including contents deletes the content in the tablespace. If the content in the tablespace is not added before the tablespace is deleted, the tablespace cannot be deleted. Therefore, this parameter is habitually added.
// Including datafiles Delete the data files in the tablespace
// Cascade Constraints

 

If the tablespace file is deleted before the tablespace is deleted, the solution is as follows:

If the data file corresponding to the tablespace is deleted before the tablespace is cleared, the database cannot be started or shut down normally.
You can use the following method to restore data (this method has been verified in Oracle9i ):
In the following process, filename is a deleted data file. If there are multiple data files, it needs to be executed multiple times. tablespace_name is the name of the corresponding tablespace.
$ Sqlplus/nolog
SQL> Conn/As sysdba;
If the database has been started, run the following line first:
SQL> shutdown abort
SQL> startup Mount
SQL> alter database datafile 'filename' offline drop;
SQL> alter database open;
SQL> drop tablespace tablespace_name including contents;

 

// Create a user and specify the tablespace

Create user zfmi identified by zfmi
Default tablespace zfmiTemporary tablespace zfmi_temp;

// The identified by parameter must have

// Grant all permissions for the message user DBA role

Grant DBA to zfmi;

// Grant permissions to users

Grant connect, resource to zfmi;(DB2: Specify all permissions)

 

Import and Export commands:

Importing and exporting Oracle Data imp/exp is equivalent to restoring and backing up ORACLE data. The exp command can export data from the remote database server to the local DMP file, and the IMP command can import the DMP file from the local to the distant database server. This function can be used to build two identical databases, one for testing and the other for formal use.

Execution environment: it can be executed in sqlplus. EXE or DoS (command line,
In dos, the installation directory ora81bin in Oracle 8i is set as a global path,
The exp. EXE and imp. EXE files in this directory are used for import and export.
Oracle is written in Java. sqlplus. EXE, exp. EXE, and imp. EXE files may be packaged class files.
Sqlplus. EXE calls the classes encapsulated by exp. EXE and imp. EXE to complete the Import and Export function.

The following describes the Import and Export instances.
Data export:
1. Export the database test completely, and the username System Password Manager is exported to D: daochu. dmp.
Exp system/manager @ test file = D: daochu. dmp full = y
2. Export the tables of system users and SYS users in the database
Exp system/manager @ test file = D: daochu. dmp owner = (system, sys)
3. Export the inner_policy and policy_staff_relat tables in the database.
Exp aichannel/aichannel @ testdb2 file = D: datanewsmgnt. dmp tables = (inner_policy, policy_staff_relat)

4. Export the data with the field filed1 in table 1 in the database starting with "00"
Exp system/manager @ test file = D: daochu. dmp tables = (Table1) query = "where filed1 like '201312 '"

The above is a commonly used export. For compression, you can use WinZip to compress the DMP file.
You can also add compress = Y to the command above.

Data Import
1. import data from D: daochu. dmp to the test database.
IMP system/manager @ test file = D: daochu. dmp
IMP aichannel/aichannel @ HUST full = y file = D: datanewsmgnt. dmp ignore = y
The above may be a problem, because some tables already exist, and then it will report an error, the table will not be imported.
Add ignore = Y to the end.
2. Import table 1 in D: daochu. dmp
IMP system/manager @ test file = D: daochu. dmp tables = (Table1)

The preceding import and export operations are sufficient. In many cases, you must first completely delete the table and then import it.

Note:
If the operator has sufficient permissions, a prompt is displayed.
Databases can be connected. You can use tnsping test to obtain whether the database test can be connected.

Appendix 1:
Add data import permissions to users
First, start SQL * puls
Second, log in with system/Manager
Third, create user username identified by password (this step can be omitted if you have already created a user)
Fourth, grant create user, drop user, alter user, create any view,
Drop any view, exp_full_database, imp_full_database,
DBA, connect, resource, create session to Username
Fifth, run-cmd-to enter the directory where the DMP file is located,
IMP userid = system/manager full = y file = *. dmp
Or imp userid = system/manager full = y file = filename. dmp

Example:
F: workoracle_databackup> imp userid = test/test full = y file = inner_policy.dmp

Screen Display
Import: Release 8.1.7.0.0-production on Thursday February 16 16:50:05 2006
(C) Copyright 2000 Oracle Corporation. All rights reserved.

Connect to: Oracle8i Enterprise Edition Release 8.1.7.0.0-Production
With the partitioning Option
Jserver release 8.1.7.0.0-Production

Export the files created by export: v08.01.07 in the normal path
The zhs16gbk Character Set and zhs16gbk nchar character set have been imported.
The export server uses the utf8 nchar character set (possible ncharset conversion)
. Importing aichannel object to aichannel
.. Importing table "inner_policy" 4 rows
Prepare to enable constraints...
Import is terminated successfully, but a warning is displayed.

Appendix 2:
Oracle cannot directly change the table owner. Export/Import can be used to achieve this purpose.
First create import9.par,
The command is as follows: IMP parfile =/filepath/import9.par
The content of import9.par is as follows:
Fromuser = tgpms
Touser = tgpms2 (Note: You can change the table owner from fromuser to touser. Users of fromuser and touser can be different)
Rows = y
Indexes = y
Grants = y
Constraints = y
Buffer= 409600
File =/backup/ctgpc_20030623.dmp
Log =/backup/import_20030623.log