introduction to the oracle dbms (29)

8/3/2019 Introduction to the Oracle Dbms (29)

http://slidepdf.com/reader/full/introduction-to-the-oracle-dbms-29 1/72

Introduction to the Oracle DBMS

Kristian Torp

Department of Computer ScienceAalborg University

www.cs.aau.dk/˜torp

[email protected]

December 2, 2011

daisy.aau.dk

Kristian Torp (Aalborg University) Introduction to the Oracle DBMS December 2, 2011 1 / 72

http://www.cs.aau.dk/~torp



mailto:[email protected]

http://daisy.aau.dk/

http://daisy.aau.dk/

mailto:[email protected]


http://find/



Outline

1 Users

2 The Data Dictionary

3 General Stuff


http://goforward/

http://find/

http://goback/



Learning Goals

Prerequisites

Knowledge about basic database concepts, e.g., table and index

Basic knowledge of SQL

Learning Goals

Use the Oracle DBMS

Know where Oracle different from standard or other DBMSs

Know how to find database metadata


http://goforward/

http://find/

http://goback/



Outline

1 Users


3 General Stuff


http://goforward/

http://find/

http://goback/



Disclaimer

For Testing Only!

Examples in the following are only for test machines!

Should not be used in a production environment!

For Production

Contact your local DBA

Read the manual on how to make a secure environment


http://goforward/

http://find/

http://goback/



Overview

Supplied Users

SYS, the “root” user of the Oracle DBMS

SYSTEM, has database administration rights

Note

It is a good idea to create a separate user for your database

How to create users is different on different DBMSs

There are nice GUI tools for creating users


http://goforward/

http://find/

http://goback/



New DBA User

User Requirements

Create a new super user on the Oracle DBMS

The new user must not be one of the supplied users.

Example (Create a Super User)

−− l o g i n as system ( p r e d e f in e d s up er u se r )s q l p l u s system@<system i d e n t i f i e r >

−− C r ea t e a new s u pe r u se r , make n i c e r p as sw or d

c r e at e u se r dbadm i d e n t i f i e d by dbadm ;

−− g ra nt r i g h t s

g r a n t dba t o dbadm ;

−− l o g o u te x i t ;

−− l o g i n as new dba

s q l p l u s dbadm / dbadm@<system i d e n t i f i e r >

−− Now change your password


http://goforward/

http://find/

http://goback/



New User

User RequirementsCreate a new user on the Oracle DBMS no administration rights

Should be able to create tables and query them

Example (Create a Super User)−− l o g i n as system

s q l p l u s dbadm@<system i d e n t i f i e r >

−− C r ea t e a new u s e r

c r e at e u se r dbuser i d e n t i f i e d by dbuser ;

−− g ra nt r i g h t s t o new u ser

g r a n t c on ne ct , r e so u rc e t o dbuser ;−− c o n ne c t as new u s e r

connect dbuse r / dbuse r

−− Now change your password


http://goforward/

http://find/

http://goback/



Drop Users

Example (Drop New Super User and Plain Users)−− l o g i n as system

s q l p l u s system@<system i d e n t i f i e r >

−− d ro p t h e u se rs c r e at e d above

d ro p u s er dbuser ;

Note

All schema object owned by the dropped users are also dropped!

You cannot drop the user currently used


http://goforward/

http://find/

http://goback/



Outline

1 Users


3 General Stuff


http://goforward/

http://find/

http://goback/



Overview of Data Dictionary

The idea in the naming

Name Description

all [rest of name] All the stuff that the current user can see

dba [rest of name] All the stuff in the database

user [rest of name] All the stuff that the current user owns

user ⊆ all ⊆ dba

Access Rights

It is possible that you do not have access to the ’dba’ views.

Example (Info. on Indexes)s e l e c t ∗

from a l l i n d e x e s

Example (Info. on Views)s e l e c t ∗

from u s e r v i e ws


http://goforward/

http://find/

http://goback/



What Stuff is in the DBMS

Example (Objects users have in the database)s e l e c t ao . owner , ao . o b j e c t t y p e , count ( ∗ ) as c n t

from a l l o b j e c t s aogroup by ao . owner , ao . o b j e c t t y p e

o r d e r by c n t desc

Note

The all objects lists all objects stored in the databaseThe object type is, e.g., tables, indexes, java classes, and synonyms

Example (Object Types)s e l e c t d i s t i n c t o b j e c t t y p e

from a l l o b j e c t s

Result

OBJECT TYPETABLE

INDEX

SYNONYM

..


http://goforward/

http://find/

http://goback/



Outline

1 Users


3 General Stuff


http://goforward/

http://find/

http://goback/



The Unix ls command

Example (Show me the stuff)s e l e c t ∗

from ca t ;

Note

cat is short for catalog

A view with two columns table name and table type

Contains tables, views, sequences (but not itself!)


http://goforward/

http://find/

http://goback/



Limiting the Number of Rows Returned

Example (Give me the first ten rows)s e l e c t ∗

from c a t

where rownum<

= 10

Note

The rownum pseudo column is Oracle specific on other DBMSs it is

called limit


O li

http://goforward/

http://find/

http://goback/



Outline

4 Tables

5 Columns

6 Constraints

7 Views


A il bl T bl

http://goforward/

http://find/

http://goback/



Available Tables

Example (Look at all my tables)s e l e c t ∗

from u s e r t a b l e s ;

Example (Look at all tables available to me)s e l e c t ∗

from a l l t a b l e s ;

Example (Find tables that are non-local)s e l e c t ∗

from a l l t a b l e s

except

s e l e c t ∗from u s e r t a b l e s ;

Note

Not union compatible!


Th d l T bl

http://goforward/

http://find/

http://goback/



The dual Table

Example (Find the current time)s e l e c t c u r re n t t i m es t a mp

from d u a l

Note

A utility table in Oracle because the from clause is required

Has one column dummy

Has one row (with the value X)

Uses the built-in function current timestamp

Cultural format, e.g., 2012-02-28 12:34:56 vs. 02-28-2012 12:34:56

Uses the dual table


S C ti I

http://goforward/

http://find/

http://goback/



Space Consumption I

Example (How much space are my tables taking up?)s e l e c t us . segment name as ” t a bl e name” ,

b y t e s / 1 0 2 4 as ”KB”

from u s er s e g m en t s us

where us . s e gm e n t t y p e = ’TABLE ’o r d e r by KB desc ;

Note

Note the word ’TABLE’ has to be in upper case


Space Consumption II

http://goforward/

http://find/

http://goback/



Space Consumption II

Example (How much space are my tables taking up (take two)?)

Another way to calculate size http://askanantha.blogspot.com/

2007/09/get-oracle-table-size.html

s e l e c t segment name as table name ,sum( b y t es ) / ( 1 0 2 4 ) as t a b l e s i z e k b

from u s e r e x t e n t s

where s e gm e nt t y pe = ’TABLE ’

group by segment name ;


Space Consumption III

http://askanantha.blogspot.com/2007/09/get-oracle-table-size.html




http://goforward/

http://find/

http://goback/



Space Consumption III

Example (How much space are my tables taking up (take three)?)Size of table based on rows http://askanantha.blogspot.com/

2007/09/get-oracle-table-size.html

s e l e c t t ab le n a me , ( a v g r o w l e n ∗num rows ) / ( 1 0 2 4 )

from u s e r t a b l e s ;

Example (Show more information on table size calculation)s e l e c t table name ,

a v g r o w l e n ,

num rows ,

( a v g r o w l e n ∗num rows ) / ( 1 0 2 4 ) ” s i z e kb ”from u s e r t a b l e s ;


Create a SQL Script to drop all Tables I





http://goforward/

http://find/

http://goback/



Create a SQL Script to drop all Tables I

Example (Drop Single Table)

drop t a b l e tab ;

Note

Time consuming when many tables

Example (A script that drops all table)s e l e c t ’ d rop t ab l e ’ | | ua . t able name | | ’ ; ’

from u s e r t a bl e s ua ;

Note|| is the string concatenation operator in Oracle

’ hello , ’ || ’ world! ’ = ’ hello , world! ’

Recall keywords case insensitive in SQL


Create a SQL Script to drop all Tables II

http://goforward/

http://find/

http://goback/



Create a SQL Script to drop all Tables II

User Requirements

All names in lower case in scripts

Example (A script that drops all tables (all lower case))s e l e c t ’ d rop t ab l e ’ | | l o w e r ( ua . t able name ) | | ’ ; ’

from u s e r t a bl e s ua ;

Note

The functionlower

converts a character string to lower case


Create a SQL Script to drop all Tables III

http://goforward/

http://find/

http://goback/



Create a SQL Script to drop all Tables III

Example (Store the drop script in a file)s e t h ea di ng o f f −− do not show t he column names

s e t f ee db ac k o f f −− do n ot w r i t e n r ows r et ur ne d a t t h e end

s e t pagesize 50000 −− make t h e page s i z e v e ry l a r g e

−− send o u tp u t t o a f i l e

s p o o l c : \ d r o p t a b l e s . s q l

−− The a c t u a l q uer y t o e xe cu te

s e l e c t ’ d rop t ab l e ’| |

l o w e r ( ua . t able name )| |

’ ; ’from u s e r t a bl e s ua ;

s po ol o f f −− s t o p w r i t i n g t o a f i l e

Example (Execute the commands in the file from within SQL∗Plus)SQL>@c: \ d r o p t a b l e s . s q l

Note

Assume file is stored in c: drop files.sql


Outline

http://goforward/

http://find/

http://goback/



Outline

4 Tables

5 Columns

6 Constraints

7 Views


Columns for a Table

http://goforward/

http://find/

http://goback/



Columns for a Table

Example (The columns on the student table)s e l e c t ∗

from u s er t a b c o l s u tc

where u t c . t a bl e n a m e = ’STUDENT ’

Note

Internally all identifiers are in upper case


Finding Specific Columns Based on Name

http://goforward/

http://find/

http://goback/



Finding Specific Columns Based on Name

Example (Columns names that include the string ID)s e l e c t ut c . ∗

from u s er t a b c o l s u tc

where ut c . column name l i k e ’%ID%’

Note

like is simple string matching and % is multi-character wildcard

Recall that internally in Oracle all identifiers are in upper case


Space Consumption Column Values

http://goforward/

http://find/

http://goback/



Space Consumption Column Values

Example (Find the number of bytes needed to store a date)s e l e c t v s i z e ( date )

from dual ;

Example (Find the number of bytes needed to store an interval)s e l e c t v s i z e ( i n t e r v a l ’ 37 12 ’ day t o ho ur )

from dual ;

Example (Find the number of bytes needed to store a float)

s e l e c t vsize(123456789012345.34567890)from dual ;


Data Types for Columns

http://goforward/

http://find/

http://goback/



Data Types for Columns

Example (Find the most used data type for columns)s e l e c t u t c . d a t a t y p e , count ( ∗ ) as n o c o l s

from u s er t a b c o l s u tcgroup by u t c . d a t a t y p e

o r d e r by n o c o l s desc


Outline

http://goforward/

http://find/

http://goback/



Outline

4 Tables

5 Columns

6 Constraints

7 Views


Finding Primary Keys

http://goforward/

http://find/

http://goback/



g y y

Example (Name of tables that have a primary key)s e l e c t uc . t able name

from u s e r c o n s t r a i nt s uc

where uc . c o n s t r a i n t t y p e = ’P ’

Constraint Types

Constraint Type Description

P Primary key

R Referential Integrity (foreign key)

C Check constraint


Missing Primary Keys

http://goforward/

http://find/

http://goback/



g y y

Example (Tables with no primary key)s e l e c t t able name

from u s e r t a b l e s

where t able name n o t i n ( s e l e c t t able name

from u s e r c o n s t r a i n t swhere c o n s t r a i n t t y p e = ’P ’ ) ;

Action to Take

Now you should add the missing primary keys or face the consequences!


Constraints on Which Columns

http://goforward/

http://find/

http://goback/



Example (Columns associated with a constraint)s e l e c t ∗

from u s er c o ns c o lu m ns ucc

where u cc . t a bl e n a m e = ’STUDENT ’

Note

Only for the Student table

All types of constraints are used


Composite Primary Keys

http://goforward/

http://find/

http://goback/



p y y

Example (Find tables with a composite primary key)s e l e c t uc . table name , count ( ucc . column name )

from u se r co ns c ol um ns ucc , u s e r c o n s t r a i n t s uc

where uc . c o n s t r a i n t t y p e = ’P ’ −− p r i m ar y keyand uc . owner = u cc . owner

and uc . c o n s tr a i n t n a m e = ucc . c o n s tr a i n t n a m e

group by uc . t able name

h a vi n g c o un t ( ucc . column name ) > 1


Outline

http://goforward/

http://find/

http://goback/



4 Tables

5 Columns

6 Constraints

7 Views


Which Views are Defined

http://goforward/

http://find/

http://goback/



Example (Show all views)

s e l e c t ∗from u s e r v i e w s


View Implementation

http://goforward/

http://find/

http://goback/



Example (The select statements used for creating the view)s e l e c t uv . t e x t

from u s er v i e ws uv

Note

The text is a long column (an old type of clob) therefore the text may not

be directly visible. Click on the field to see the content in most IDEs.


Outline

http://goforward/

http://find/

http://goback/



8 Sequences

9 Directories and Files

10 Synonyms

11 Comments


Which Sequences are Available

http://goforward/

http://find/

http://goback/



Example (Find all sequences)s e l e c t ∗

from user sequences

Example (Find the last number used from the sequence)s e l e c t us . l a s t n u m b e r

from u s er s e q u en c es us


Outline

http://goforward/

http://find/

http://goback/



8 Sequences


10 Synonyms

11 Comments


Examples

http://goforward/

http://find/

http://goback/



Example (Create a Directory Alias)

c re at e d i r e c t o r y f i l e s t u f f as ’ c : \ tmp ’ ;

Note

Directory alias file stuff is stored and used in upper case FILE STUFF

Directory name is case sensitive

No warning if directory does not exists on server side

Example (Create a Stupid Directory Alias)c re at e d i r e c t o r y dummy as ’ c : \ DoesNotExist ’ ;

Note

Create a directory alias to a non-existing directory


Overview: Directories

http://goforward/

http://find/

http://goback/



Idea

An alias for a directory on the server file system

Can be used to read from and write to files

Must have the create any directory to create directories

Directory aliases can be use for external tables

If the directory is drop in the operating system, a run-time error is

raised if alias is used.


List Directory Aliases

http://goforward/

http://find/

http://goback/



Examples e l e c t ∗

from a l l d i r e c t o r i e s ;

Note

Describes all directories aliases accessible to the current user

View is in the sys schema


Grant

http://goforward/

http://find/

http://goback/



Example (Grant Read/Write Access)g r a n t r ead , w r i t e on d i r e c t o r y f i l e s t u f f t o <user name> ;

Note

Provides both read and write rights the directory alias

Example (Grant Read-Only Access)g ra nt read on d i r e c t o r y f i l e s t u f f t o <user name> ;

NoteProvides only read rights the directory alias


Write A String to A File

http://goforward/

http://find/

http://goback/



c r e at e o r r e pl a c e p ro ce du re s t r 2 f i l e ( d ir n am e varchar2 ,

f i l e n a m e varchar2 ,

s t r v a r c h a r 2 )as

v f i l e u t l f i l e . f i l e t y p e ;

begin

v f i l e : = u t l f i l e . fo pen ( d ir n am e , f i l e n a me , ’w ’ ) ;

u t l f i l e . p u t l i n e ( v f i l e , s t r ) ;

u t l f i l e . f c l o s e ( v f i l e ) ;e x c e p t i o n

when o t h e r s t h en

i f u t l f i l e . i s o p e n ( v f i l e ) then

u t l f i l e . f c l o s e ( v f i l e ) ;

end i f ;

end ;

Example (Called the Stored Procedure)execute s t r 2 f i l e ( ’FILE STUFF ’ , ’ n e w f i l e . t x t ’ , ’ H e l l o F i l e ! ’ ) ;


Convert a Text file to a clob Il f i f i l 2 l b ( d i h 2

http://goforward/

http://find/

http://goback/



c re at e o r r ep la ce f u n c t io n f i l e 2 c l o b ( d ir n am e varchar2 ,

f i l e n a m e v a r c h a r 2 )

r e t u r n c l o b i s

v f i l e u t l f i l e . f i l e t y p e ; v c l o b c l o b ;

v l i n e v a r c h a r 2 ( 2 0 0 0 ) ; v l e n g t h i n t ;

begin

dbms lob . crea t et emp orar y ( v c lo b , f a l s e ) ;

v f i l e : = u t l f i l e . fo pen ( d ir n am e , f i l e n a me , ’ r ’ ) ;

begin

l o o pu t l f i l e . g e t l i n e ( v f i l e , v l i n e ) ;

v l e n g t h : = dbms l ob . g e t l e n g t h ( v c l o b ) + 1 ;

dbms lob . w r i t e ( v c lo b , l e ng t h ( v l i n e ) , v l en gt h , v l i n e ) ;

end l o o p ;

e x c e p t i o n when o t h e r s t h en

i f u t l f i l e . i s o p e n ( v f i l e ) thenu t l f i l e . f c l o s e ( v f i l e ) ;

end i f ;

end ;

r e t u r n v c l o b ;


Convert a Text file to a clob II

http://goforward/

http://find/

http://goback/



Example (Use the Clob Conversion)−− Cr eate a t a b l e w i th a c l ob column

c re at e t a b l e withA Clob ( i i n t , l c l o b ) ;

−− Use t he new f u n c t i o n t o l oa d a f i l e i n t o a c l ob columkn

i n s e r t i n t o withAClob

v a l u e s ( 1 , f i l e 2 c l o b ( ’FILE STUFF ’ , ’ t e s t r e a d f i l e . t x t ’ ) ) ;

commit ;

−− Check f i l e i s ‘ ‘ u plo aded ’ ’ as a c l o b

s e l e c t ∗

from withAClob ;


Updating/Moving a Directory

http://goforward/

http://find/

http://goback/



Example (Relocate Directory Alias)c re at e o r r ep la ce d i r e c t o r y f i l e s t u f f as ’ c : \ tmp \ d b f i l e s ’ ;

Note

The directory alias has now been relocated

Example (Stupid Relocation)c re at e o r r ep la ce d i r e c t o r y f i l e s t u f f as ’ / un ix / path / dos / machine ’ ;

NoteNo warning/error when creating non-existing directory


Dropping

http://goforward/

http://find/

http://goback/



Example (Drop a Directory)drop d i r e c t o r y f i l e s t u f f ;

Note

The directory alias is now removed


Outline

http://goforward/

http://find/

http://goback/



8 Sequences


10 Synonyms

11

Comments


Introduction

http://goforward/

http://find/

http://goback/



Concept

A synonym is an alias, such that it is simpler to refer to databaseobjects own by another user.

Example (List all non-public synonyms)

s e l e c t ∗from a ll s yn on ym s a l s

where al s . owner <> ’PUBLIC ’ ;

Note

A public synonym is visible to all database usersPublic synonyms are used heavily by the Oracle DBMS to provide

access to meta data.


Synonyms for Tables

http://goforward/

http://find/

http://goback/



Example

Find the synonym name plus the base table for a public synonym that

is a table and starts with a ’D’

s e l e c t al s . synonym name , al s . t able owner , a l s . t able name

from a ll s yn on ym s a l s

where a l s . owner = ’ PUBLIC ’

and a l s . synonym name l i k e ’D%’and e x i s t s ( s e l e c t ’ x ’

from a l l t a b l e s a t t

where a t t . owner = a l s . t a b l e o w n e r

and a t t . t ab l e n am e = a l s . t ab l e n am e ) ;

Note

The dual is return. This means that dual is real table and not a view.


Outline

http://goforward/

http://find/

http://goback/



8 Sequences


10 Synonyms

11

Comments


Comments on Tables

http://goforward/

http://find/

http://goback/



Example (Find all tables with comments)s e l e c t ut c . ∗

from u se r t ab c o mm en ts u t cwhere u t c . comments i s n o t n u l l


Column Comments

http://goforward/

http://find/

http://goback/



Example (Find column comments on the Student table)s e l e c t ucc . column name , ucc . comments

from u s e r c o l c om m e n ts u ccwhere u cc . t a bl e n a m e = ’STUDENT ’


Outline

http://goforward/

http://find/

http://goback/



12 Stored Procedures

13 Triggers

14 Timing


The Unix ls command I

Example (Create the ls command as a stored procedure)

http://goforward/

http://find/

http://goback/



Example (Create the ls command as a stored procedure)c r e at e o r r e pl a c e p ro ce du re l s i s

c u r s o r c t a b l e s i s

s e l e c t ∗ from ca t ;v t a b l e n a m e c a t . t a bl e n a m e%t ype ;

v t y p e c a t . t a b l e t y p e%t ype ;

begin

open c t a b l e s ;

l o o p

f e t c h c t a b l e s i n t o v t ab le n am e , v t y p e ;

e x i t when c t a b l e s %not f ound ;

p ( v t a b l e n a m e ) ;

end l o o p ;

c l o s e c t a b l e s ;

end ;

/

Note

The slash ’/’ at the end


The Unix ls command II

http://goforward/

http://find/

http://goback/



Example (Executed the stored procedure)−− t o enabl e o u tp ut from t he s er v er

s e t s e r v e r o u t p u t on

−− exec i s s h or t f o r executeexec l s ;


Space Usage Function I

http://goforward/

http://find/

http://goback/



User Requirements

Create a stored procedure that returns the space usage for a table

Must take the table name as input and return the size in KB


Space Usage Function II

http://goforward/

http://find/

http://goback/



Examplec re at e o r r ep la ce f u n c t io n space usage

( p t a b l e n a m e i n u s e r t a b l e s . t a bl e n a m e%t y p e )

r e t u r n number i s

v s i z e k b number ;

begin

s e l e c t ( u t . a v g r o w l e n∗

u t . num rows ) / ( 1 0 2 4 )i n t o v s i z e k b

from u s er t a bl e s u t

where u t . t a bl e n a m e = upper ( p t a b l e n a m e ) ;

r e t u r n v s i z e k b ;

end ; /


Space Usage Function III

http://goforward/

http://find/

http://goback/



NoteThe into keyword

The upper keyword

The return keyword

It is very important that parameter names, e.g., p table name aredifferent from any colum name

The code convention is to prefix all parameter names with ’p ’

There is no error handling here at all Should be added in a production version


Space Usage Function IV

Example (Executed the function)

http://goforward/

http://find/

http://goback/



Example (Executed the function)−− t o enabl e o u tp ut from t he s er v er

s e t s e r v e r o u t p u t on

d e c l a r e

v r v number ;

begin

v r v : = space usage ( ’ s t u d e n t ’ ) ;

d bm s o ut pu t . p u t l i n e ( ’ S ize s t u d e n t t a b l e i s ’ | | v r v | | ’ K B ’ ) ;

end ; /

Note

Note allowed to use lower case table names, e.g., student

The return value has to be defined

The return is printed to the screen

The trailing slash


See the Source Code

http://goforward/

http://find/

http://goback/



Example (Show source code for the ls stored procedure )s e l e c t us . t e x t

from u s e r s ou r c e us

where us . name = ’ LS ’

o r d e r by us . l i n e

Note

The text comes out in the corrected order due to the order by clause

Note the bad name convention there is a column name name. This

names overlaps with a reserved word


Reserved Words in PL/SQL

http://goforward/

http://find/

http://goback/



Reserved Words

There is a huge number of reserved words in PL/SQL.They can (naturally) be queried

Example (List the Reserved Words)s e l e c t ∗

from v $ r e s er v e d w o r d s

Note

All v$ views are also called dynamic views

Access Rights

It is possible that you do not have access to the view v$reserved words


Outline

http://goforward/

http://find/

http://goback/




13 Triggers

14 Timing


Introduction

http://goforward/

http://find/

http://goback/



Example (List all tables with triggers)s e l e c t d i s t i n c t ut . table name

from u s e r t r i g g e r s u twhere u t . b a s e o b j e c t t y p e = ’TABLE ’


Outline

http://goforward/

http://find/

http://goback/




13 Triggers

14 Timing


Timing a Query

Example (From SQL∗Plus)

http://goforward/

http://find/

http://goback/



Example (From SQL∗Plus)s e t h ea di ng o f f

s e t pagesize 50000

s e t t er mo ut o f f

s p o o l c : \ t e s t . l s t

t i m i n g s t a r t

−− S t a r t query t o t im e

s e l e c t c . c a r i d , c . r o ad i d , c . speed

from c ar g p s a r r ay co r d e r by c a r i d desc ;

−− Stop q ue ry t o t im e

t i m i n g st op

s po ol o f f

s e t t e r m o u t on

Note

Output is spooled to a file

The result of the query is not displayed on screen


Outline

http://goforward/

http://find/

http://goback/



15 Tablespace Usage

16 Additional Information


Space Usage

http://goforward/

http://find/

http://goback/



Example (Space consumption for tablespaces)s e l e c t segment name , tablespace name , sum( b y t e s / ( 1 0 2 4 ∗ 1 0 2 4 ) ) ”MB”

from dba segments

where owner= ’TORP ’ and segment name no t l i k e ’ BIN ’

group by segment name , tablespace name

o r d e r by segment name , tablespace name ;

Note

Dropped tablespaces are not included

Dropped database objects are in the ’BIN’ segment

The size is in MB


Outline

http://goforward/

http://find/

http://goback/



15 Tablespace Usage

16 Additional Information


Web Sites

http://goforward/

http://find/

http://goback/



SitesOracle technical network otn.oracle.com

The official homepage good information but no critique

Morgan’s Library www.psoug.org/library.html

Many concrete examples, little or no explanationdbazine.com’s Oracle home page www.dbazine.com/oracle

Good examples

dbasupport.com’s www.dbasupport.com/oracle/

Overall good site with informaton on several DBMSs


http://otn.oracle.com/

http://www.psoug.org/library.html

http://www.dbazine.com/oracle

http://www.dbasupport.com/oracle/

http://www.dbasupport.com/oracle/

http://www.dbazine.com/oracle

http://www.psoug.org/library.html

http://otn.oracle.com/

http://goforward/

http://find/

http://goback/

introduction to the oracle dbms (29)

Documents