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Tablespace and Database in Oracle
What is the relationship between Tablespace and database in Oracle.
Extract from ebook material :
CREATE DATABASE TEST
CONTROLFILE REUSE
LOGFILE
GROUP 1 .......
DATAFILE 'C:\ORADATA\TEST\SYSTEM01.
CREATE TABLESPACE HIST2004
DATAFILE '/ORADATA/PROD/HIST2004.DB
To my limited knowledge in Oracle, Tablespace is existed within a database and tables and index are created under tablespace. So, what is the point of creating datafile for database ? What does it contain ?
Default database orcl is created, when I try to create a Database based on the extract of ebook above, I told me that database parameter oracl not match. Any idea ??? Does it mean that only one database is allowed in a machine ?
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Answers
In addition to the above, database consists of tablespaces, data files, control files, users, objects like roles, tables, indexes, log files, rollback segments etc...
tablespaces cannot exist without a database. I mean we can create tablespaces for the tablespace.
tablespaces are logical structures , data files are physical files residing in some directory in the file system which contain the database objects data.
just to give you a bit more understanding, we can have as many tablespaces you want for a tablespace. For example, small database with 2 or 3 users can have a separate tablespace for tables and a separate tablespace for indexes. This is just an example to give a better understanding.
A tablespace cannot exist in the database without the physical file in the file system.
Thanks but how to create additional database on the same machine. Default database when install in orcl. And when I run the following script, it return with error "database name 'TEST' does not match parameter db_name 'orcl'". To me, it seem that I can only create tablespaces under "orcl", rather than create another database and start creating tablespaces under it. Tks.
SQL> shutdown immediate
Database dismounted.
ORACLE instance shut down.
SQL> startup nomount
ORACLE instance started.
Total System Global Area 209715200 bytes
Fixed Size 1248116 bytes
Variable Size 88081548 bytes
Database Buffers 113246208 bytes
Redo Buffers 7139328 bytes
SQL> create database TEST
2 controlfile reuse
3 logfile
4 group 1 'C:\oracle\product\10.2.0\
5 group 2 'C:\oracle\product\10.2.0\
6 group 3 'C:\oracle\product\10.2.0\
7 datafile 'C:\oracle\product\10.2.0\
8 autoextend on next 50M maxsize unlimited
9 sysaux datafile 'C:\oracle\product\10.2.0\
10 autoextend on next 50M maxsize unlimited
11 default temporary tablespace temp tempfile 'C:\oracle\product\10.2.0\
12 autoextend on next 100M maxsize 8000M
13 undo tablespace undo
14 datafile 'C:\oracle\product\10.2.0\
15 autoextend on next 100M maxsize unlimited
16 character set we8mswin1252
17 national character set al16utf16
18 user sys identified by SOUPERSEEKRET
19 user system identified by MYSEEKRET;
create database TEST
*
ERROR at line 1:
ORA-01501: CREATE DATABASE failed
ORA-01504: database name 'TEST' does not match parameter db_name 'orcl'
You can create additional databases (instances) using the GUI called DBCA (Data base creation assistant)
It is easy, but you have very carefully to plan the new Instance. The most important question are:
1. What will be the Character set (we8mswin1252, AL32UTF8)
2. How much free RAM I have and how RAm will I devote for the
new database for the SGA. In Windows it is recommended to keep free
50% of the RAM to avoid spooling problems.
Tablespaces are logical sets used for keeping tables, indexes and other DB objects.
The comprises of one or more data files that physically represents the tablespaces.
On logical level you use tablespaces. Every user can have quota on every tablespace and usage
privileges. This privileges are controlled by the DBA - it is very important.
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by: sujit_kumarPosted on 2007-07-23 at 08:33:50ID: 19548420
Datafile is a physical file that is created within a database. Tablespace is a logical structure which is created using a data file. As you said, i database can contain 1 or more Tablespaces (And data files).
You can create more than 1 database in a machine, but 1 tablespace will exist in ONLY 1 database. Database is the super-set, Tablespace is the subset.