temporary tablespace用途
用于排序，可以建立多个临时表空间，但默认的临时表空间只能有一个，default temporary tablespace不能offline和drop。如果未指定默认的临时表空间，oracle将会使用system作为临时表空间（非本地管理），只有temp表空间是nologing。
temporary tablespace原地重建
alter tablespace temp add tempfile ‘/opt/oracle/oradata/orcl/temp01.dbf’ size 100m reuse;
临时表空间什么时候需要原地重建
当查看dba_temp_files;没有检索出内容时，需要原地重建
idle>select file_id,file_name,tablespace_name,bytes/1024/1024 from dba_temp_files;
FILE_ID FILE_NAME TABLESPACE_NAME BYTES/1024/1024
---------- ------------------------------------------------------------ ------------------------------ ---------------
1 /opt/oracle/oradata/orcl/temp01.dbf TEMP 100
2 /opt/oracle/oradata/orcl/temp02.dbf TEMP2 10
查看临时数据文件size
dba_temp_files
v$tempfile
查看默认的临时表空间
idle>col property_value for a30;
idle>col description for a40;
idle>select * from database_properties;
PROPERTY_NAME PROPERTY_VALUE DESCRIPTION
------------------------------ ------------------------------ ----------------------------------------
DICT.BASE 2 dictionary base tables version #
DEFAULT_TEMP_TABLESPACE TEMP Name of default temporary tablespace
DEFAULT_PERMANENT_TABLESPACE USERS Name of default permanent tablespace
DEFAULT_EDITION ORA$BASE Name of the database default edition
Flashback Timestamp TimeZone GMT Flashback timestamp created in GMT
TDE_MASTER_KEY_ID
DST_UPGRADE_STATE NONE State of Day Light Saving Time Upgrade
DST_PRIMARY_TT_VERSION 11 Version of primary timezone data file
DST_SECONDARY_TT_VERSION 0 Version of secondary timezone data file
DEFAULT_TBS_TYPE SMALLFILE Default tablespace type
NLS_LANGUAGE AMERICAN Language
NLS_TERRITORY AMERICA Territory
NLS_CURRENCY $ Local currency
NLS_ISO_CURRENCY AMERICA ISO currency
NLS_NUMERIC_CHARACTERS ., Numeric characters
NLS_CHARACTERSET WE8MSWIN1252 Character set
NLS_CALENDAR GREGORIAN Calendar system
NLS_DATE_FORMAT DD-MON-RR Date format
NLS_DATE_LANGUAGE AMERICAN Date language
NLS_SORT BINARY Linguistic definition
NLS_TIME_FORMAT HH.MI.SSXFF AM Time format
NLS_TIMESTAMP_FORMAT DD-MON-RR HH.MI.SSXFF AM Time stamp format
NLS_TIME_TZ_FORMAT HH.MI.SSXFF AM TZR Time with timezone format
NLS_TIMESTAMP_TZ_FORMAT DD-MON-RR HH.MI.SSXFF AM TZR Timestamp with timezone format
NLS_DUAL_CURRENCY $ Dual currency symbol
NLS_COMP BINARY NLS comparison
NLS_LENGTH_SEMANTICS BYTE NLS length semantics
NLS_NCHAR_CONV_EXCP FALSE NLS conversion exception
NLS_NCHAR_CHARACTERSET AL16UTF16 NCHAR Character set
NLS_RDBMS_VERSION 11.2.0.1.0 RDBMS version for NLS parameters
GLOBAL_DB_NAME ORCL Global database name
EXPORT_VIEWS_VERSION 8 Export views revision #
WORKLOAD_CAPTURE_MODE CAPTURE implies workload capture is in p
rogress
WORKLOAD_REPLAY_MODE PREPARE implies external replay clients
can connect; REPLAY implies workload rep
lay is in progress
NO_USERID_VERIFIER_SALT 8BF56230FC49D6ECFE53EB96A5922D
D5
DBTIMEZONE 00:00 DB time zone
36 rows selected.
切换默认临时表空间
alter database default temporary tablespace temp3;
指定用户使用临时表空间
alter user scott temporary tablespace temp2;
创建临时表空间 ,新增/删除tempfile
idle>create temporary tablespace temp3 tempfile '/opt/oracle/oradata/orcl/temp03.dbf' size 10m;
Tablespace created.
idle>alter tablespace temp2 add tempfile '/opt/oracle/oradata/orcl/temp04.dbf' size 5m;
Tablespace altered.
idle>select file_id,file_name,tablespace_name,bytes/1024/1024 from dba_temp_files;
FILE_ID FILE_NAME TABLESPACE_NAME BYTES/1024/1024
---------- ---------------------------------------- -------------------- ---------------
1 /opt/oracle/oradata/orcl/temp01.dbf TEMP 100
2 /opt/oracle/oradata/orcl/temp02.dbf TEMP2 10
3 /opt/oracle/oradata/orcl/temp03.dbf TEMP3 10
4 /opt/oracle/oradata/orcl/temp04.dbf TEMP2 5
idle>alter tablespace temp2 drop tempfile '/opt/oracle/oradata/orcl/temp04.dbf';
Tablespace altered.
创建临时表空间组
idle>alter tablespace temp tablespace group group1;
Tablespace altered.
idle>alter tablespace temp2 tablespace group group1;
Tablespace altered.
idle>select * from dba_tablespace_groups;
GROUP_NAME TABLESPACE_NAME
------------------------------ --------------------
GROUP1 TEMP
GROUP1 TEMP2
idle>
将临时表空间组设成默认临时表空间，实现负载均衡
alter database default temporary tablespace group1;
移除表空间组时，该组不能使缺省的临时表空间
idle>alter database default temporary tablespace group1;
Database altered.
idle>alter database default temporary tablespace temp;
Database altered.
idle>alter tablespace temp tablespace group '';
Tablespace altered.
idle>alter tablespace temp2 tablespace group '';
Tablespace altered.
idle>select * from dba_tablespace_groups;
no rows selected
idle>drop tablespace temp2 including contents and datafiles;
Tablespace dropped.
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