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标签归档:ORA-01652
永久表空间出现临时段不能扩展原因探讨
数据库版本
SQL> select * from v$version; BANNER ----------------------------------------------------------------------- Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - Production PL/SQL Release 11.2.0.3.0 - Production CORE 11.2.0.3.0 Production TNS for Linux: Version 11.2.0.3.0 - Production NLSRTL Version 11.2.0.3.0 - Production
创建5M测试表空间
SQL> CREATE TABLESPACE T_1652 DATAFILE '/tmp/t_1652_01.dbf' size 5M 2 AUTOEXTEND OFF LOGGING PERMANENT EXTENT MANAGEMENT LOCAL AUTOALLOCATE 3 SEGMENT SPACE MANAGEMENT AUTO blocksize 8192; Tablespace created.
测试CTAS
SQL> create table CHF.T_XIFENFEI TABLESPACE T_1652 as 2 select LPAD('XIFENFEI',1024,'F') "C_XFF" from dual connect by level <=3500; create table CHF.T_XIFENFEI TABLESPACE T_1652 as * ERROR at line 1: ORA-01652: unable to extend temp segment by 128 in tablespace T_1652 SQL> create table CHF.T_XIFENFEI TABLESPACE T_1652 as 2 select LPAD('XIFENFEI',1024,'F') "C_XFF" from dual connect by level <=3000; Table created.
测试CREATE INDEX
SQL> create index chf.i_xifenfei on chf.t_xifenfei(c_xff) 2 tablespace t_1652; create index chf.i_xifenfei on chf.t_xifenfei(c_xff) * ERROR at line 1: ORA-01658: unable to create INITIAL extent for segment in tablespace T_1652 SQL> Select MAX(d.bytes) total_bytes, 2 nvl(SUM(f.Bytes), 0) free_bytes, 3 d.file_name, 4 MAX(d.bytes) - nvl(SUM(f.bytes), 0) used_bytes, 5 from DBA_FREE_SPACE f , DBA_DATA_FILES d 6 where f.tablespace_name(+) = d.tablespace_name 7 and f.file_id(+) = d.file_id 8 and d.tablespace_name = 'T_1652' 9 group by d.file_name; TOTAL_BYTES FREE_BYTES FILE_NAME USED_BYTES ----------- ---------- ------------------------- ---------- 5242880 0 /tmp/t_1652_01.dbf 5242880 SQL> drop table chf.t_xifenfei purge; Table dropped. SQL> create table CHF.T_XIFENFEI TABLESPACE T_1652 as 2 select LPAD('XIFENFEI',1024,'F') "C_XFF" from dual connect by level <=2000; Table created. SQL> Select MAX(d.bytes) total_bytes, 2 nvl(SUM(f.Bytes), 0) free_bytes, 3 d.file_name, 4 MAX(d.bytes) - nvl(SUM(f.bytes), 0) used_bytes, 5 from DBA_FREE_SPACE f , DBA_DATA_FILES d 6 where f.tablespace_name(+) = d.tablespace_name 7 and f.file_id(+) = d.file_id 8 and d.tablespace_name = 'T_1652' 9 group by d.file_name; TOTAL_BYTES FREE_BYTES FILE_NAME USED_BYTES ----------- ---------- ------------------------- ---------- 5242880 1048576 /tmp/t_1652_01.dbf 4194304 SQL> create index chf.i_xifenfei on chf.t_xifenfei(c_xff) 2 tablespace t_1652; create index chf.i_xifenfei on chf.t_xifenfei(c_xff) * ERROR at line 1: ORA-01652: unable to extend temp segment by 128 in tablespace T_1652 SQL> ALTER DATABASE DATAFILE '/tmp/t_1652_01.dbf' RESIZE 10M; Database altered. SQL> create index chf.i_xifenfei on chf.t_xifenfei(c_xff) 2 tablespace t_1652; Index created.
测试MOVE
SQL> drop table chf.t_xifenfei purge; Table dropped. SQL> create table CHF.T_XIFENFEI TABLESPACE T_1652 as 2 select LPAD('XIFENFEI',1024,'F') "C_XFF" from dual connect by level <=3500; Table created. SQL> alter table chf.t_xifenfei move; alter table chf.t_xifenfei move * ERROR at line 1: ORA-01652: unable to extend temp segment by 128 in tablespace T_1652 SQL> Select MAX(d.bytes) total_bytes, 2 nvl(SUM(f.Bytes), 0) free_bytes, 3 d.file_name, 4 MAX(d.bytes) - nvl(SUM(f.bytes), 0) used_bytes, 5 from DBA_FREE_SPACE f , DBA_DATA_FILES d 6 where f.tablespace_name(+) = d.tablespace_name 7 and f.file_id(+) = d.file_id 8 and d.tablespace_name = 'T_1652' 9 group by d.file_name; TOTAL_BYTES FREE_BYTES FILE_NAME USED_BYTES ----------- ---------- ------------------------- ---------- 10485760 4194304 /tmp/t_1652_01.dbf 6291456 SQL> ALTER DATABASE DATAFILE '/tmp/t_1652_01.dbf' RESIZE 15M; Database altered. SQL> alter table chf.t_xifenfei move; Table altered.
这里可以发现CTAS,CREATE INDEX,MOVE操作都有个共同点:需要一次性创建一个较大SEGMENT,但是这个SEGMENT的创建过程是在数据库中逐渐实现(非初始化指定大小)。
也就是说,ORACLE对这些对象的处理方法是:对于这样的segment先当作临时段处理,当处理完成后,再把这些在永久表空间中的临时段转换为永久段;所以当这些永久表空间中的临时段在扩展的时候,遇到该永久表空间不足,而该段目前还是临时段(在永久表空间中的临时段),就出现了ORA-01652提示一个永久表空间unable to extend temp segment