OracleOracleOracle

9.1 9.2 9.3 9.4 9.5

9.1 9.1.1 9.1.2

(Table, Index, )

data fileos blockOracleI/O

9.2 9.2.1 9.2.2 9.2.3

9.2.1

OracleORACLEOracledb_block_size

9.2.2

PCTFREE = 20%PCTUSED = 40%

PCTFREE PCTFREEUPDATEPCTFREEINSERT

PCTFREE PCTFREE 1

2123

PCTUSED PCTUSED

(Block) Pctfree 10 Pctfree, Pctused, 100 Pctused 40 Inittrans 1 2 Maxtrans 255 UpdatePcrfree 20Pctused 40Insert, Select, UpdatePctfree 5Pctused 60, SelectPctfree 5Pctused 90 Pctfree 0

9.2.3

Before updateAfter update

9. 3 9.3.1 9.3.2 9.3.3

9.3.1 OracleOracleOracle

9.3.2

+ Drop+ Truncated+ (

9.3.3

extentinitial

next

maxextents extent

Minextents extent

pctincrease optimal ()

Initial 5 2 Next 5 1 Minextents 1 1 Maxextents 1 Pctincrease 50 0

, initial = next pctincrease 1 pctincrease 0

Oracleextents

9. 4 9.4.1 9.4.2 9.4.3

9.4.1 DBA_SEGMENTS

9.4.2

9.4.3 DBA_SEGMENTSOWNER SEGMENT_NAME SEGMENT_TYPE TABLESPACE_NAME EXTENTS BLOCKS INITIAL_EXTENT NEXT_EXTENT MIN_EXTENTS MAX_EXTENTS PCT_INCREASE

DBA_EXTENTSOWNERSEGMENT_NAMEEXTENT_ID TABLESPACE_NAMEFILE_IDBLOCK_IDBLOCKS

DBA_FREE_SPACETABLESPACE_NAME FILE_ID BLOCK_IDBLOCKS ()

9. 5 9.5.1 9.5.2 9.5.3 9.5.4

9.5.1

9.5.2 OracleSYSTEM

(1) (2) (3)

I/OI/O

9.5.3 system

9.5.4 9.5.4.1 9.5.4.2 9.5.4.3 9.5.4.4 9.5.4.5

9.5.4.1

CREATE TABLESPACE testspace DATAFILE f:\orcl\testspace1.dbf' SIZE 100M , f:\orcl\testspace2.dbf' SIZE 100M DEFAULT STORAGE (INITIAL 128K NEXT 128KMINEXTENTS 1 MAXEXTENTS UNLIMITED PCTINCREASE 0)EXTENT MANAGEMENT DICTIONARY;

create tablespacedefault storageminimum extentUNIFORMOracleAUTOALLOCATECREATE TABLESPACE user_data DATAFILE f:\orcl\user_data_01.dbf' SIZE 500M EXTENT MANAGEMENT LOCAL UNIFORM SIZE 10M;

systemsystemsystemsystemDBA

create tablespace temp datafile f:\orcl\temp01.dbf size 300M default storage (initial 2M next 2M pctincrease 0 maxextents unlimited) extent management dictionary temporary;

create temporary tablespace temp tempfile f:\orcl\temp_01.dbf size 500M extent management local uniform size 10M;

9.5.4.2

alter tablespace Alter TABLESPACE tablespace { minimum extent integer [k|m] | default storage_clause}

12M alter tablespace app_data minimum extent 2m;

22M2M999 alter tablespace app_data default storage{ initial 2m next 2m maxextents 999);

system alter tablespace user_data online; alter tablespace app_data offline;

system alter tablespace user read_only; alter tablespace app_data read write ;

courseora-0165unable to extend table course in tablespace app_data

alter tablespace student_data add datafile f:\orcl\student2.dbf size 1000M;

student_datastudent3.dbf50MB create tablespace student_data datafile f:\orcl\student3.dbf size 200M autoextend on next 50M maxsize unlimited default storage(initial 100m next 100m minextents 1 maxextents unlimited pctincrease 0);

alter database alter database [databasename] datafile "filename".. resize integer [K|M] alter database datafile f:\orcl\student2.dbf resize 200M;

ALTER TABLESPACE1 ALTER TABLESPACE app_data OFFLINE;23 ALTER TABLESPACE app_data RENAME DATAFILEf:\orcl\app_data_01.dbf' TOd:\orcl\app_data_01.dbf';4 ALTER TABLESPACE app_data ONLINE;

ALTER DATABASE123STARTUP MOUNT4 ALTER DATABASE RENAME FILE f:\orcl\system_01.dbf' TO d:\orcl\system_01.dbf';5ALTER DATABASE OPEN

9.5.4.3 drop tablespace DROP TABLESPACE tablespace_name DROP TABLESPACE tablespace_name INCLUDING CONTENTS;

9.5.4.4 DBA_TABLESPACESV$TABLESPACEDBA_DATA_FILESV$DATAFILEDBA_TEMP_FILESV$TEMPFILE

DBA_TABLESPACESDBA_SEGMENTSDBA_DATA_FILESDBA_FREE_SPACEDBA_EXTENTS

dba_tablespacesdba_data_filesdba_free_spacedba_segmentsdba_extentsdba_free_spacedba_free_spacedba_extents

SQL> select status, bytes, name from v$datafile

SQL> select tablespace_name, bytes, autoextensible, file_name from dba_data_files;

SQL> select * from v$tablespace

SQL>select tablespace_name,block_size,initial_extent,next_extent from dba_tablespaces;

SCOTT SQL> select segment_name, extents, blocks from dba_segments where owner= 'SCOTT';

HRSQL> select segment_type, tablespace_name, file_id, bytes from dba_extents where owner='HR';

SCOTTEMPSQL> select extent_id,file_id,block_id,blocks from dba_extents where owner='SCOTT' and segment_name='EMP';

empSQL> select count(*) extents, sum(bytes) bytes_used, sum(blocks) block_used from dba_extents where owner='SCOTT' and segment_name='EMP' and segment_type='TABLE';

SQL> select owner, segment_name, segment_type, count(*) extents, sum(bytes) bytes_used, sum(blocks) blocks_used from dba_extents where tablespace_name='SYSTEM group by owner,segment_name,segment_type order by owner,segment_name,segment_type;

sql>select tablespace_name, count(*), max(blocks), sum(blocks) from dba_free_space group by tablespace_name;

9.5.4.5 SYSTEM

OracleOracle

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