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The most headache before is to insert data into the table, there is a primary key problem. Because the primary key cannot be duplicated, you have to use a function to customize a rule to generate duplicate values to assign to the primary key.Now that Oracle has sequence, it doesn't have to be that troublesome.Transferred from: http://zhoufoxcn.blog.51cto.com/792419/166418/Let's first assume that there is a table:CreateTableS_depart (DepartidINT notNUL
The method for creating an auto-increment field in Oracle-A Brief Introduction to oracle sequence first assumes that there is such a table: create table S_Depart ( DepartId INT not null, DepartName NVARCHAR2( 40) not null, DepartOrder INT defa
some views to speed up the project progress. In order to make the creation and modification of Basic Tables not necessarily related to the creation and modification of views, so as to facilitate the synchronization of work between employees and improve work efficiency, in the Oracle database, the concept of "Force create View" is proposed. That is to say, under
$ sql_workarea_active information about the current system workspace--In the v$process dynamic performance view, you can query the memory and memory used by the PGA allocated to each Oracle process,--where pga_used_mem represents a used, Pag_alloc_mem represents an assigned, pga_max_men represents the maximum value of the PGA.Sql> select Pid,pga_used_mem,pga_alloc_mem,pga_max_mem from v$process;--
, VARCHAR2, CLOB, LONG, and other data types(2) used to mark table names, column names, PL/SQL variables, etc.(3) used to store SQL and PL/SQL program units2.4.2 National Character Set:(1) used to store NCHAR, NVARCHAR2, NCLOB, and other data types(2) The National Character Set is essentially an additional character set selected for oracle. It is mainly used to enhance the character processing capability of oracle
Character Set SuperWhen the encoded value of a character set (character set a) contains the encoded value of all another character set (character set B), and the same encoded value for both character sets represents the same character, the character set A is the super of character set B, or character set B is a subset of character set A.Oracle8i and Oracle9i have a subset-super table (Subset-superset pairs) in the official documentation, for example: WE8ISO8859P1 is a subset of we8mswin1252. Be
Oracle server-side operations are generally as follows: 1) Installing Oracle Server Software2) Create database (automatically created at installation)3) Configure monitoring (automatic configuration at installation)4) Start Oracle Instance5) Create user table space6)
>sqlplus.exe/as SYSDBA Sql*plus:release 11.2.0.2.0 Production on Friday December 18 11:17:05 2015 Copyright (c) 1982, Oracle. All rights reserved. Connected to the idle routine. Sql>create SPFile from Pfile; The file was created. 8. Start the database to Nomount Sql>startup Nomount Ora-32004:obsolete or deprecated parameter (s) specified for RDBMS instanceOra-12853:insufficient memory for PX buffers:curre
the database, that is, data files and redo log files. The user still cannot establish a connection or session with the database in the mount status. If the control file reuse copy is lost or damaged, oracle Reports an error. You need to restore the control file, modify the parameter file, manually create the control file, or replace the lost or damaged control file. 3. open Mode You can establish a connect
any procedure, debug connect session to HR;Oracle creates table spaces, creates users, grants, access to authorized objects, and view permissions1. Create a temporary table spaceThe Oracle temp table space is used primarily for querying and storing some buffer data. The primary reason for the temporary tablespace cons
Let's assume that there is a table: Copy Code code as follows: CREATE TABLE S_depart ( Departid INT NOT NULL, Departname NVARCHAR2 () NOT NULL, Departorder INT Default 0, Constraint Pk_s_depart primary KEY (Departid) ); In Oracle sequence is called the serial number, each time it will automatically increase, generally used in the need to order by serial number of places. 1
stored in binary mode, and the user cannot modify the contents of the control file. Suppose the user modifies the database name in the parameter file, modifying the db_name value. However, at Oracle startup, a ORA-01103 error is returned because the db_name in the parameter file is inconsistent with the database name in the control file, causing the database to fail to start. Database parameter file: [Oracle
encoded value of a character set (character set a) contains the encoded value of all another character set (character set B), and the two character sets have the same encoded value representing the same character, the character set A is the super of character set B, or the character set B is a subset of the character set A. A subset-Super table (Subset-superset pairs) is available in official documentation for Oracle8i and oracle9i, for example: WE8ISO8859P1 is a subset of we8mswin1252. Because
: (The number of logs may be slightly different)Control01.ctl example01.dbf redo02.log sysaux01.dbf undotbs01.dbfControl02.ctl Redo03.log system01.dbf users01.dbfControl03.ctl Redo01.log shttest.dbf temp01.dbfThree How to view Oracle logs:Sql>select * from V$sql (#查看最近所作的操作)Sql>select * FROMV $sqlarea (#查看最近所作的操作)All changes to the Oracle database are recorded in
)Two What the Oracle log file contains: (The number of logs may be slightly different)Control01.ctl example01.dbf redo02.log sysaux01.dbf undotbs01.dbfControl02.ctl Redo03.log system01.dbf users01.dbfControl03.ctl Redo01.log shttest.dbf temp01.dbfThree How to view Oracle logs:Sql>select * from V$sql (#查看最近所作的操作)Sql>select * FROMV $sqlarea (#查看最近所作的操作)All changes
commands shocould work even when the database is not running! This is important when you want to change a database to use an spfile before you start it.How can I create a pfile from an spfile?The commands for creating a pfile are almost identical to those for creating a spfile before t you reverse the order of spfile and pfile:If your pfile is in the default location and you want your spfile created there as well run
1. View Overview A view is actually a query SQL statement used to display relevant data in one or more tables or other views. The view uses the results of a query as a table. Therefore, the view can be viewed as a stored query or a virtual table. The view comes from the
, 2005, Oracle. All rights reserved.Connected to an idle instance.sql> startup Nomount;ORACLE instance started.Total System Global area 314572800 bytesFixed Size 1219160 bytesVariable Size 96470440 bytesDatabase buffers 213909504 bytesRedo buffers 2973696 bytessql> @createDB. sqlDatabase created.7, run the underlying script for the corresponding databaseThe following 5 scripts are executed under the SYS sch
1. View Overview A view is actually a query SQL statement used to display relevant data in one or more tables or other views. The view uses the results of a query as a table. Therefore, the view can be viewed as a stored query or a virtual table. The view comes from the tabl
1. View Overview A view is actually a query SQL statement used to display relevant data in one or more tables or other views. The view uses the results of a query as a table. Therefore, the view can be viewed as a stored query or a virtual table. The view comes from th
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