Oracle 表空间高水位收缩全攻略

1. 概述

本文档是针对某个特定用户表空间收缩的文档，实际操作要结合生产库具体情况。主要包括以下几个流程：

收集当前数据库相关信息
降低数据库表高水位线
Resize 收缩数据文件
具体细节详见以下章节。

2. 时间规划

操作类型	预估时间	实际时间
数据库信息收集	30min	10min
降低高水位线	30min	20min
Resize 数据文件	30min	10min

3. 详细步骤

3.1. 收集数据库相关信息

3.1.1. 查看表空间使用情况

SQL> SELECT total.tablespace_name,
       Round(total.MB, 2)           AS Total_MB,
       Round(total.MB - free.MB, 2) AS Used_MB,
       Round(( 1 - free.MB / total.MB ) * 100, 2)
       || '%'                       AS Used_Pct
FROM   (SELECT tablespace_name,
               Sum(bytes) / 1024 / 1024 AS MB
        FROM   dba_free_space
        GROUP  BY tablespace_name) free,
       (SELECT tablespace_name,
               Sum(bytes) / 1024 / 1024 AS MB
        FROM   dba_data_files
        GROUP  BY tablespace_name) total
WHERE  free.tablespace_name = total.tablespace_name;

TABLESPACE_NAME                  TOTAL_MB    USED_MB USED_PCT
------------------------------ ---------- ---------- -----------------------------------------
SYSAUX                               5000    1359.19 27.18%
SYSTEM                               1024     625.13 61.05%
TS_AUD                               4000    1483.19 37.08%
TS_BJCA                               512     118.63 23.17%
TS_BT                                 512        .06 .01%
TS_CHDD                              2000     864.06 43.2%
TS_DATA                           2167482  496135.81 22.89%
TS_FCCH                               512       1.94 .38%
TS_FDC                              50000   36266.88 72.53%
TS_INDEX                           390000  294789.81 75.59%
TS_LOG                              30000   23551.81 78.51%
TS_RMAN                               512     266.06 51.97%
TS_SB                                6000       4594 76.57%
TS_SCJY                             10000     5618.5 56.19%
TS_WHMS                               512     310.38 60.62%
TS_ZLPT                              2048     484.06 23.64%
UNDOTBS1                            60000   59999.63 100%
USERS                                5000    1060.06 21.2% 

# 与客户描述的一致，TS_DATA表空间量大，但实际使用量小。

3.1.2. 查看表空间上的用户

SQL> select owner,tablespace_name ,sum(bytes)/1024/1024/1024 G from dba_segments where tablespace_name = 'TS_DATA' group by owner,tablespace_name;

OWNER                          TABLESPACE_NAME                         G
------------------------------ ------------------------------ ----------
TMC                            TS_DATA                        454.085266
IBMS_SEC                       TS_DATA                        .005004883
PLATFORM                       TS_DATA                        .290893555
SZFDC                          TS_DATA                        .661071777
GTB_APP                        TS_DATA                         .20111084
FDC_ZJJYJZX                    TS_DATA                        7.76208496
SZFDCOA                        TS_DATA                        1.01373291
BWPLATFORM                     TS_DATA                        16.6900024
SZFDC_CA                       TS_DATA                        2.73272705
FDC_YJZX                       TS_DATA                        1.35357666
FLOOR                          TS_DATA                        108.474243
SHENBAO                        TS_DATA                        .002502441
IBMS                           TS_DATA                         1.8303833
FCCH                           TS_DATA                         .26361084
PUCHA                          TS_DATA                         .19140625
FDCYS                          TS_DATA                        7.56640625
RIS_ACCESS                     TS_DATA                        1.08044434

17 rows selected.

3.1.3. 查看表空间TOP 10大表

SQL> select * from (
  2     select owner, segment_name, segment_type, tablespace_name, bytes/1024/1024/1024 "G"
  3     from dba_segments where segment_type = 'TABLE' and tablespace_name = 'TS_DATA' order by bytes desc)
  4  where rownum <= 10;

OWNER               SEGMENT_NAME                         SEGMENT_TYPE       TABLESPACE_NAME              G
------------------- ------------------------------------ ------------------ ------------------- ----------
TMC                 FDC_INFO_QRY_LOG_2020                TABLE              TS_DATA             144.490234
TMC                 TMC_LOG                              TABLE              TS_DATA             86.6728516
TMC                 BIN$tvmjhUBAC37gVAALXeBfRg==$0       TABLE              TS_DATA             50.9677734
TMC                 BIN$tvSoznk+ICjgVAALXeBfRg==$0       TABLE              TS_DATA               30.59375
TMC                 REMC_WS_LOG_REQUEST                  TABLE              TS_DATA             9.87109375
FDCYS               SYS_20191171126389483_TEMP           TABLE              TS_DATA                 3.4375
BWPLATFORM          SOA_SYSTEM_LOG                       TABLE              TS_DATA                  3.125
FDCYS               TRADE_RECORD                         TABLE              TS_DATA                2.90625
TMC                 JG_TBL_FDC_EST_REGISTE               TABLE              TS_DATA             2.87890625
TMC                 MLOG$_FDC_TMC_CONTRACT               TABLE              TS_DATA             1.44433594

3.1.4. 查看表空间TOP 10大索引

SQL> select * from (
  2  select owner, segment_name, segment_type, tablespace_name, bytes/1024/1024/1024 "G"
  3  from dba_segments where segment_type = 'INDEX' and tablespace_name = 'TS_DATA' order by bytes desc)
  4  where rownum <= 10;

OWNER              SEGMENT_NAME                 SEGMENT_TYPE       TABLESPACE_NAME             G
-----------------  ---------------------------- ------------------ ------------------ ----------
TMC                TMC_LOG_PK                   INDEX              TS_DATA              13.03125
BWPLATFORM         SOA_SYSTEM_LOG               INDEX              TS_DATA            .433837891
TMC                INDEX_USER                   INDEX              TS_DATA            .419921875
TMC                INDEX_ORGAN                  INDEX              TS_DATA               .390625
BWPLATFORM         PK_PLAT_USER_LOGIN_LOG       INDEX              TS_DATA            .267150879
TMC                SEI_IX_NAME                  INDEX              TS_DATA            .216796875
TMC                FTVC_IX_EXPIRE_DATE          INDEX              TS_DATA              .1953125
FDCYS              I_TR_YWBJSJ                  INDEX              TS_DATA              .1953125
BWPLATFORM         SYS_C0066879                 INDEX              TS_DATA              .1484375
TMC                FTVC_UK_CERT_NO_FO_ID        INDEX              TS_DATA              .1328125

10 rows selected.

3.1.5. 查看表空间管理方式

SQL> select tablespace_name, block_size,contents, extent_management, segment_space_management, allocation_type, segment_space_management from dba_tablespaces where tablespace_name='TS_DATA';

TABLESPACE_NAME                BLOCK_SIZE CONTENTS  EXTENT_MAN SEGMEN ALLOCATIO SEGMEN
------------------------------ ---------- --------- ---------- ------ --------- ------
TS_DATA                              8192 PERMANENT LOCAL      AUTO   SYSTEM    AUTO

3.1.6. 查看数据文件使用情况

SQL> col file_name for a50
SQL> select file_name, tablespace_name, bytes/1024/1024/1024 "used G", maxbytes/1024/1024/1024 "total G" from dba_data_files where tablespace_name = 'TS_DATA' order by bytes;

FILE_NAME                                          TABLESPACE_NAME                    used G    total G
-------------------------------------------------- ------------------------------ ---------- ----------
/Oradata/2nd_fdc/TS_DATA74.dbf                     TS_DATA                                 5          0
/Oradata/2nd_fdc/TS_DATA76.dbf                     TS_DATA                                 5          0
/Oradata/2nd_fdc/TS_DATA75.dbf                     TS_DATA                                 5          0
/Oradata/2nd_fdc/TS_DATA38.dbf                     TS_DATA                          19.53125          0
/Oradata/2nd_fdc/TS_DATA39.dbf                     TS_DATA                          19.53125          0
/Oradata/2nd_fdc/TS_DATA40.dbf                     TS_DATA                          19.53125          0
/Oradata/2nd_fdc/TS_DATA41.dbf                     TS_DATA                          19.53125          0
/Oradata/2nd_fdc/TS_DATA42.dbf                     TS_DATA                          19.53125          0
/Oradata/2nd_fdc/TS_DATA65.dbf                     TS_DATA                          19.53125          0
/Oradata/2nd_fdc/TS_DATA68.dbf                     TS_DATA                        29.2773438  29.296875
/Oradata/2nd_fdc/TS_DATA69.dbf                     TS_DATA                        29.2773438  29.296875
/Oradata/2nd_fdc/TS_DATA03.dbf                     TS_DATA                         29.296875          0
/Oradata/2nd_fdc/TS_DATA04.dbf                     TS_DATA                         29.296875          0
/Oradata/2nd_fdc/TS_DATA05.dbf                     TS_DATA                         29.296875          0
/Oradata/2nd_fdc/TS_DATA06.dbf                     TS_DATA                         29.296875          0
/Oradata/2nd_fdc/TS_DATA07.dbf                     TS_DATA                         29.296875          0
/Oradata/2nd_fdc/TS_DATA08.dbf                     TS_DATA                         29.296875          0
/Oradata/2nd_fdc/TS_DATA09.dbf                     TS_DATA                         29.296875          0
/Oradata/2nd_fdc/TS_DATA10.dbf                     TS_DATA                         29.296875          0
/Oradata/2nd_fdc/TS_DATA15.dbf                     TS_DATA                         29.296875          0
/Oradata/2nd_fdc/TS_DATA16.dbf                     TS_DATA                         29.296875          0
/Oradata/2nd_fdc/TS_DATA17.dbf                     TS_DATA                         29.296875          0
/Oradata/2nd_fdc/TS_DATA20.dbf                     TS_DATA                         29.296875          0
/Oradata/2nd_fdc/TS_DATA21.dbf                     TS_DATA                         29.296875          0
/Oradata/2nd_fdc/TS_DATA22.dbf                     TS_DATA                         29.296875          0
/Oradata/2nd_fdc/TS_DATA23.dbf                     TS_DATA                         29.296875          0
/Oradata/2nd_fdc/TS_DATA24.dbf                     TS_DATA                         29.296875          0
/Oradata/2nd_fdc/TS_DATA25.dbf                     TS_DATA                         29.296875          0
/Oradata/2nd_fdc/TS_DATA26.dbf                     TS_DATA                         29.296875          0
/Oradata/2nd_fdc/TS_DATA28.dbf                     TS_DATA                         29.296875          0
/Oradata/2nd_fdc/TS_DATA29.dbf                     TS_DATA                         29.296875          0
/Oradata/2nd_fdc/TS_DATA30.dbf                     TS_DATA                         29.296875          0
/Oradata/2nd_fdc/TS_DATA31.dbf                     TS_DATA                         29.296875          0
/Oradata/2nd_fdc/TS_DATA32.dbf                     TS_DATA                         29.296875          0
/Oradata/2nd_fdc/TS_DATA33.dbf                     TS_DATA                         29.296875          0
/Oradata/2nd_fdc/TS_DATA34.dbf                     TS_DATA                         29.296875          0
/Oradata/2nd_fdc/TS_DATA35.dbf                     TS_DATA                         29.296875          0
/Oradata/2nd_fdc/TS_DATA36.dbf                     TS_DATA                         29.296875          0
/Oradata/2nd_fdc/TS_DATA43.dbf                     TS_DATA                         29.296875          0
/Oradata/2nd_fdc/TS_DATA44.dbf                     TS_DATA                         29.296875          0
/Oradata/2nd_fdc/TS_DATA45.dbf                     TS_DATA                         29.296875          0
/Oradata/2nd_fdc/TS_DATA46.dbf                     TS_DATA                         29.296875          0
/Oradata/2nd_fdc/TS_DATA47.dbf                     TS_DATA                         29.296875          0
/Oradata/2nd_fdc/TS_DATA48.dbf                     TS_DATA                         29.296875          0
/Oradata/2nd_fdc/TS_DATA49.dbf                     TS_DATA                         29.296875          0
/Oradata/2nd_fdc/TS_DATA50.dbf                     TS_DATA                         29.296875          0
/Oradata/2nd_fdc/TS_DATA51.dbf                     TS_DATA                         29.296875          0
/Oradata/2nd_fdc/TS_DATA52.dbf                     TS_DATA                         29.296875          0
/Oradata/2nd_fdc/TS_DATA53.dbf                     TS_DATA                         29.296875          0
/Oradata/2nd_fdc/TS_DATA54.dbf                     TS_DATA                         29.296875          0
/Oradata/2nd_fdc/TS_DATA55.dbf                     TS_DATA                         29.296875          0
/Oradata/2nd_fdc/TS_DATA56.dbf                     TS_DATA                         29.296875          0
/Oradata/2nd_fdc/TS_DATA57.dbf                     TS_DATA                         29.296875          0
/Oradata/2nd_fdc/TS_DATA58.dbf                     TS_DATA                         29.296875          0
/Oradata/2nd_fdc/TS_DATA59.dbf                     TS_DATA                         29.296875          0
/Oradata/2nd_fdc/TS_DATA60.dbf                     TS_DATA                         29.296875          0
/Oradata/2nd_fdc/TS_DATA61.dbf                     TS_DATA                         29.296875          0
/Oradata/2nd_fdc/TS_DATA62.dbf                     TS_DATA                         29.296875          0
/Oradata/2nd_fdc/TS_DATA63.dbf                     TS_DATA                         29.296875          0
/Oradata/2nd_fdc/TS_DATA64.dbf                     TS_DATA                         29.296875          0
/Oradata/2nd_fdc/TS_DATA66.dbf                     TS_DATA                         29.296875          0
/Oradata/2nd_fdc/TS_DATA67.dbf                     TS_DATA                         29.296875          0
/Oradata/2nd_fdc/TS_DATA02.dbf                     TS_DATA                         29.296875          0
/Oradata/2nd_fdc/TS_DATA37.dbf                     TS_DATA                         29.296875          0
/Oradata/2nd_fdc/TS_DATA01.dbf                     TS_DATA                         29.296875          0
/Oradata/2nd_fdc/TS_DATA71.dbf                     TS_DATA                                30          0
/Oradata/2nd_fdc/TS_DATA72.dbf                     TS_DATA                                30          0
/Oradata/2nd_fdc/TS_DATA73.dbf                     TS_DATA                                30          0
/Oradata/2nd_fdc/TS_DATA70.dbf                     TS_DATA                                30          0
/Oradata/2nd_fdc/TS_DATA27.dbf                     TS_DATA                        31.9550781 31.9999847
/Oradata/2nd_fdc/TS_DATA12.dbf                     TS_DATA                        31.9921875 31.9999847
/Oradata/2nd_fdc/TS_DATA13.dbf                     TS_DATA                        31.9921875 31.9999847
/Oradata/2nd_fdc/TS_DATA18.dbf                     TS_DATA                        31.9921875 31.9999847
/Oradata/2nd_fdc/TS_DATA19.dbf                     TS_DATA                        31.9921875 31.9999847
/Oradata/2nd_fdc/TS_DATA11.dbf                     TS_DATA                        31.9921875 31.9999847
/Oradata/2nd_fdc/TS_DATA14.dbf                     TS_DATA                        31.9921875 31.9999847

76 rows selected.

3.1.7. 查看表空间高水位线情况

SQL> select max(block_id)*8/1024/1024 "G size" from dba_extents where tablespace_name='TS_DATA';

    G size
----------
31.9920731

3.2. 降低高水位线

3.2.1. 检查失效索引（建议处理高水位前和后都要检查。并及时处理失效索引）

--检查分区索引（包括分区表的分区本地索引，分区表的分区全局索引），如果存在重建，并修改并行度 
select 'alter index '||a.index_owner||'.'||a.index_name||' rebuild  partition '||a.partition_name ||' parallel 10;' from 
dba_ind_partitions a 
where a.status='UNUSABLE'; 
select 'alter index '||a.index_owner||'.'||a.index_name||' parallel 1;' from 
dba_ind_partitions a 
where a.status='UNUSABLE’; 

--检查普通索引(包括普通表的索引，分区表的普通全局索引)，如果存在重建，并修改并行度 
select 'alter index '||a.owner||'.'||a.index_name||' rebuild  parallel 10;' from 
dba_indexes a 
where a.status='UNUSABLE'; 
select 'alter index '||a.owner||'.'||a.index_name||'   parallel 1;' from 
dba_indexes a 
where a.status='UNUSABLE’;

3.2.2. 查询指定用户中的高水位

# 比较表的行数和表的大小关系。如果行数为0，而表的当前占用大小减去初始化时的大小（INITIAL_EXTENT）后依然很大，那么说明该表有高水位。=====为了保证结果准确，建议先对表进行统计信息收集。
# 查看TMC用户高水位
SQL> SELECT D.OWNER,
  2         ROUND(D.NUM_ROWS / D.BLOCKS, 2),
  3         D.NUM_ROWS,
  4         D.BLOCKS,
  5         D.TABLE_NAME,
  6   ROUND((d.BLOCKS*8-D.INITIAL_EXTENT/1024)/1024)  t_size
  7    FROM DBA_TABLES D
  8   WHERE D.BLOCKS > 10
  9     AND ROUND(D.NUM_ROWS / D.BLOCKS, 2) < 5
 10   AND d.OWNER = 'TMC' ;

OWNER    ROUND(D.NUM_ROWS/D.BLOCKS,2)   NUM_ROWS     BLOCKS TABLE_NAME                         T_SIZE
-------- ---------------------------- ---------- ---------- ------------------------------ ----------
TMC                               2.6       2597       1000 EX_ZQ_MIDDLE_ACCESS                     8
TMC                              2.31         30         13 EX_ZW_SRV_CONFIG                        0
TMC                               1.1         66         60 FDC_ROLES_CATALOG                      -1
TMC                               .35         21         60 FDC_ORGANTYPE_SUBSYSTEM                -1
TMC                                .1          6         58 FDC_USER_DEV_UPLOAD                     0
TMC                              3.05    1149260     377166 JG_TBL_FDC_EST_REGISTE               2947
TMC                                 0          0       1522 JG_TBL_JSYDGH                          12
TMC                                 0          0       2410 JG_TBL_LAND_CONTRACT                   19
TMC                              4.83     713497     147670 FDC_YS_CONTRACT_APPENDIX             1154
TMC                              1.94       3646       1882 SIREA_REPORT_3                         15
TMC                              2.56        625        244 DZZZ_FDC_YS_PREPROJECT                  2
TMC                               .22       9703      44390 FDC_ORGAN_REPORT_DEV_USER             347
TMC                                 0          0         13 SYS_20185311110401376_TEMP              0
TMC                              1.57    1902326    1210229 REMC_WS_LOG_REQUEST                  9455

# 查看表上边的索引
SQL> select index_name, status from dba_indexes where owner = 'TMC' and table_name = 'JG_TBL_FDC_EST_REGISTE';
INDEX_NAME                     STATUS
------------------------------ --------
EST_REGISTE_PARCEL_NO          VALID
EST_REGISTE_PROJ_NO            VALID

SQL> select index_name, status from dba_indexes where owner = 'TMC' and table_name = 'FDC_YS_CONTRACT_APPENDIX';
INDEX_NAME                     STATUS
------------------------------ --------
SYS_IL0000060570C00006$$       VALID
SYS_IL0000060570C00020$$       VALID
FYCA_IX_FYC_ID                 VALID
FYCA_IX_YS_FYB_ID              VALID
SYS_IL0000060570C00026$$       VALID
FYCA_PK                        VALID

6 rows selected.

SQL> select index_name, status from dba_indexes where owner = 'TMC' and table_name = 'REMC_WS_LOG_REQUEST';
INDEX_NAME                     STATUS
------------------------------ --------
SYS_IL0000142741C00026$$       VALID
SYS_IL0000142741C00027$$       VALID
SYS_IL0000142741C00028$$       VALID


# 查看FDCYS用户高水位线
SELECT D.OWNER,
       ROUND(D.NUM_ROWS / D.BLOCKS, 2),
       D.NUM_ROWS,
       D.BLOCKS,
       D.TABLE_NAME,
 ROUND((d.BLOCKS*8-D.INITIAL_EXTENT/1024)/1024)  t_size
  FROM DBA_TABLES D
 WHERE D.BLOCKS > 10
   AND ROUND(D.NUM_ROWS / D.BLOCKS, 2) < 5
 AND d.OWNER = 'FDCYS' ;

OWNER                          ROUND(D.NUM_ROWS/D.BLOCKS,2)   NUM_ROWS     BLOCKS TABLE_NAME                         T_SIZE
------------------------------ ---------------------------- ---------- ---------- ------------------------------ ----------
FDCYS                                                     0          0     449636 SYS_20191171126389483_TEMP           3513

# 查看表上的索引
SQL> select index_name,status from dba_indexes where owner = 'FDCYS' and table_name = 'SYS_20191171126389483_TEMP';

INDEX_NAME                     STATUS
------------------------------ --------
SYS_C0060562                   VALID

3.2.1. 收缩指定表的高水位线

# TMC用户收缩高水位线
alter table TMC.JG_TBL_FDC_EST_REGISTE enable row movement;
alter table TMC.JG_TBL_FDC_EST_REGISTE shrink space;
alter index TMC.EST_REGISTE_PARCEL_NO rebuild;
alter index TMC.EST_REGISTE_PROJ_NO rebuild;
alter table TMC.JG_TBL_FDC_EST_REGISTE disable row movement;

alter table TMC.FDC_YS_CONTRACT_APPENDIX enable row movement;
alter table TMC.FDC_YS_CONTRACT_APPENDIX shrink space;
alter index TMC.FYCA_IX_FYC_ID rebuild parallel 4 nologging;
alter index TMC.FYCA_IX_YS_FYB_ID rebuild parallel 4 nologging;
alter index TMC.FYCA_PK rebuild parallel 4 nologging;
alter index TMC.FYCA_IX_FYC_ID parallel 1 ;
alter index TMC.FYCA_IX_YS_FYB_ID parallel 1 ;
alter index TMC.FYCA_PK parallel 1 ;
alter index TMC.FDC_YS_CONTRACT_APPENDIX disable row movement;

alter table TMC.REMC_WS_LOG_REQUEST enable row movement;
alter table TMC. REMC_WS_LOG_REQUEST shrink space;
alter table TMC.REMC_WS_LOG_REQUEST disable row movement;

# FDCYS用户收缩高水位线
alter table FDCYS.SYS_20191171126389483_TEMP enable row movement;
alter table FDCYS.SYS_20191171126389483_TEMP shrink space;
alter index SYS_C0060562 rebuild;
alter table FDCYS.SYS_20191171126389483_TEMP disable row movement;

3.2.2. 重新收集表的统计信息

exec dbms_stats.gather_table_stats('TMC','JG_TBL_FDC_EST_REGISTE',cascade=>true);
exec dbms_stats.gather_table_stats('TMC','FDC_YS_CONTRACT_APPENDIX',cascade=>true);
exec dbms_stats.gather_table_stats('TMC','REMC_WS_LOG_REQUEST',cascade=>true);
exec dbms_stats.gather_table_stats('FDCYS','SYS_20191171126389483_TEMP',cascade=>true);


如果是大表，建议使用如下语句进行统计信息收集
说明：需要替换用户名、表名、及分区名（如果是分区表） 
如果要单独分析表的某个分区，将 --granularity和--  partname=>'p200902', 这句注释去掉，并替换分区名 

begin 
  DBMS_STATS.GATHER_TABLE_STATS(ownname=>'NETFORCE', 
                                tabname=>'TBL_PROCESS_DRAFT', 
                                --granularity => 'PARTITION', 
                                --partname=>'POPERATIONPROCESS0102',   
                                estimate_percent=>1, 
                                method_opt=>'FOR ALL COLUMNS SIZE 1', 
                                no_invalidate=>false, 
                                cascade=>true, 
                                degree => 10);                        
end ; 
/

3.3. Resize 数据文件

# 查看最大可resize的数据文件大小
col name for a50
col resizecmd for a90
select a.file#,
a.name,
a.bytes / 1024 / 1024 CurrentMB,
ceil(HWM * a.block_size / 1024 / 1024) Resizeto,
(a.bytes - HWM * a.block_size) / 1024 / 1024 releaseMB,
'alter database datafile ''' || a.name || ''' resize ' ||
ceil(HWM * a.block_size / 1024 / 1024) || 'M;' ResizeCmd
from v$datafile a,
(select file_id, max(block_id + blocks - 1) HWM
from dba_extents
where tablespace_name = 'TS_DATA'
group by file_id) b
where a.file# = b.file_id(+)
and (a.bytes - HWM * a.block_size) > 0
order by 5;

FILE# NAME                              CURRENTMB   RESIZETO  RELEASEMB RESIZECMD
----- -------------------------------- ---------- ---------- ---------- -------------------------------------------------------------------------
    7 /Oradata/2nd_fdc/TS_DATA02.dbf        30000      30000      .0625 alter database datafile '/Oradata/2nd_fdc/TS_DATA02.dbf' resize 30000M;
    9 /Oradata/2nd_fdc/TS_DATA04.dbf        30000      30000      .0625 alter database datafile '/Oradata/2nd_fdc/TS_DATA04.dbf' resize 30000M;
    6 /Oradata/2nd_fdc/TS_DATA01.dbf        30000      30000      .0625 alter database datafile '/Oradata/2nd_fdc/TS_DATA01.dbf' resize 30000M;
   41 /Oradata/2nd_fdc/TS_DATA29.dbf        30000      30000      .0625 alter database datafile '/Oradata/2nd_fdc/TS_DATA29.dbf' resize 30000M;
   12 /Oradata/2nd_fdc/TS_DATA07.dbf        30000      30000      .0625 alter database datafile '/Oradata/2nd_fdc/TS_DATA07.dbf' resize 30000M;
   61 /Oradata/2nd_fdc/TS_DATA45.dbf        30000      30000      .0625 alter database datafile '/Oradata/2nd_fdc/TS_DATA45.dbf' resize 30000M;
   26 /Oradata/2nd_fdc/TS_DATA17.dbf        30000      30000      .0625 alter database datafile '/Oradata/2nd_fdc/TS_DATA17.dbf' resize 30000M;
   31 /Oradata/2nd_fdc/TS_DATA22.dbf        30000      30000      .0625 alter database datafile '/Oradata/2nd_fdc/TS_DATA22.dbf' resize 30000M;
   10 /Oradata/2nd_fdc/TS_DATA05.dbf        30000      30000      .0625 alter database datafile '/Oradata/2nd_fdc/TS_DATA05.dbf' resize 30000M;
   19 /Oradata/2nd_fdc/TS_DATA12.dbf        32760      32760      .0625 alter database datafile '/Oradata/2nd_fdc/TS_DATA12.dbf' resize 32760M;
   14 /Oradata/2nd_fdc/TS_DATA09.dbf        30000      30000      .0625 alter database datafile '/Oradata/2nd_fdc/TS_DATA09.dbf' resize 30000M;
   13 /Oradata/2nd_fdc/TS_DATA08.dbf        30000      30000      .0625 alter database datafile '/Oradata/2nd_fdc/TS_DATA08.dbf' resize 30000M;
   11 /Oradata/2nd_fdc/TS_DATA06.dbf        30000      30000      .0625 alter database datafile '/Oradata/2nd_fdc/TS_DATA06.dbf' resize 30000M;
   83 /Oradata/2nd_fdc/TS_DATA65.dbf        20000      20000      .0625 alter database datafile '/Oradata/2nd_fdc/TS_DATA65.dbf' resize 20000M;
   20 /Oradata/2nd_fdc/TS_DATA13.dbf        32760      32760      .0625 alter database datafile '/Oradata/2nd_fdc/TS_DATA13.dbf' resize 32760M;
   18 /Oradata/2nd_fdc/TS_DATA11.dbf        32760      32760      .0625 alter database datafile '/Oradata/2nd_fdc/TS_DATA11.dbf' resize 32760M;
   24 /Oradata/2nd_fdc/TS_DATA15.dbf        30000      30000      .0625 alter database datafile '/Oradata/2nd_fdc/TS_DATA15.dbf' resize 30000M;
   15 /Oradata/2nd_fdc/TS_DATA10.dbf        30000      30000      .0625 alter database datafile '/Oradata/2nd_fdc/TS_DATA10.dbf' resize 30000M;
   49 /Oradata/2nd_fdc/TS_DATA36.dbf        30000      30000      .0625 alter database datafile '/Oradata/2nd_fdc/TS_DATA36.dbf' resize 30000M;
   39 /Oradata/2nd_fdc/TS_DATA27.dbf        32722      32722      .0625 alter database datafile '/Oradata/2nd_fdc/TS_DATA27.dbf' resize 32722M;
   25 /Oradata/2nd_fdc/TS_DATA16.dbf        30000      30000      .0625 alter database datafile '/Oradata/2nd_fdc/TS_DATA16.dbf' resize 30000M;
    8 /Oradata/2nd_fdc/TS_DATA03.dbf        30000      30000      .0625 alter database datafile '/Oradata/2nd_fdc/TS_DATA03.dbf' resize 30000M;
   30 /Oradata/2nd_fdc/TS_DATA21.dbf        30000      30000      .0625 alter database datafile '/Oradata/2nd_fdc/TS_DATA21.dbf' resize 30000M;
   45 /Oradata/2nd_fdc/TS_DATA32.dbf        30000      30000      .0625 alter database datafile '/Oradata/2nd_fdc/TS_DATA32.dbf' resize 30000M;
   29 /Oradata/2nd_fdc/TS_DATA20.dbf        30000      30000      .0625 alter database datafile '/Oradata/2nd_fdc/TS_DATA20.dbf' resize 30000M;
   27 /Oradata/2nd_fdc/TS_DATA18.dbf        32760      32760      .0625 alter database datafile '/Oradata/2nd_fdc/TS_DATA18.dbf' resize 32760M;
   28 /Oradata/2nd_fdc/TS_DATA19.dbf        32760      32760      .0625 alter database datafile '/Oradata/2nd_fdc/TS_DATA19.dbf' resize 32760M;
   35 /Oradata/2nd_fdc/TS_DATA23.dbf        30000      30000       .125 alter database datafile '/Oradata/2nd_fdc/TS_DATA23.dbf' resize 30000M;
   76 /Oradata/2nd_fdc/TS_DATA60.dbf        30000      30000       .125 alter database datafile '/Oradata/2nd_fdc/TS_DATA60.dbf' resize 30000M;
   74 /Oradata/2nd_fdc/TS_DATA58.dbf        30000      30000       .125 alter database datafile '/Oradata/2nd_fdc/TS_DATA58.dbf' resize 30000M;
   21 /Oradata/2nd_fdc/TS_DATA14.dbf        32760      32760       .125 alter database datafile '/Oradata/2nd_fdc/TS_DATA14.dbf' resize 32760M;
   50 /Oradata/2nd_fdc/TS_DATA37.dbf        30000      30000      .1875 alter database datafile '/Oradata/2nd_fdc/TS_DATA37.dbf' resize 30000M;
   40 /Oradata/2nd_fdc/TS_DATA28.dbf        30000      30000      .1875 alter database datafile '/Oradata/2nd_fdc/TS_DATA28.dbf' resize 30000M;
   44 /Oradata/2nd_fdc/TS_DATA31.dbf        30000      30000      .3125 alter database datafile '/Oradata/2nd_fdc/TS_DATA31.dbf' resize 30000M;
   58 /Oradata/2nd_fdc/TS_DATA43.dbf        30000      30000      .3125 alter database datafile '/Oradata/2nd_fdc/TS_DATA43.dbf' resize 30000M;
   43 /Oradata/2nd_fdc/TS_DATA30.dbf        30000      30000      .3125 alter database datafile '/Oradata/2nd_fdc/TS_DATA30.dbf' resize 30000M;
   67 /Oradata/2nd_fdc/TS_DATA51.dbf        30000      30000      .3125 alter database datafile '/Oradata/2nd_fdc/TS_DATA51.dbf' resize 30000M;
   82 /Oradata/2nd_fdc/TS_DATA64.dbf        30000      30000      .5625 alter database datafile '/Oradata/2nd_fdc/TS_DATA64.dbf' resize 30000M;
   56 /Oradata/2nd_fdc/TS_DATA42.dbf        20000      20000       .625 alter database datafile '/Oradata/2nd_fdc/TS_DATA42.dbf' resize 20000M;
   85 /Oradata/2nd_fdc/TS_DATA67.dbf        30000      29973     27.875 alter database datafile '/Oradata/2nd_fdc/TS_DATA67.dbf' resize 29973M;
   84 /Oradata/2nd_fdc/TS_DATA66.dbf        30000      29645    355.875 alter database datafile '/Oradata/2nd_fdc/TS_DATA66.dbf' resize 29645M;
  102 /Oradata/2nd_fdc/TS_DATA74.dbf         5120       3580   1540.875 alter database datafile '/Oradata/2nd_fdc/TS_DATA74.dbf' resize 3580M;
   90 /Oradata/2nd_fdc/TS_DATA70.dbf        30720      29121   1599.875 alter database datafile '/Oradata/2nd_fdc/TS_DATA70.dbf' resize 29121M;
  103 /Oradata/2nd_fdc/TS_DATA75.dbf         5120       3422   1698.875 alter database datafile '/Oradata/2nd_fdc/TS_DATA75.dbf' resize 3422M;
   91 /Oradata/2nd_fdc/TS_DATA71.dbf        30720      28993   1727.875 alter database datafile '/Oradata/2nd_fdc/TS_DATA71.dbf' resize 28993M;
  104 /Oradata/2nd_fdc/TS_DATA76.dbf         5120       3295   1825.875 alter database datafile '/Oradata/2nd_fdc/TS_DATA76.dbf' resize 3295M;
   88 /Oradata/2nd_fdc/TS_DATA69.dbf        29980      22035  7945.9375 alter database datafile '/Oradata/2nd_fdc/TS_DATA69.dbf' resize 22035M;
   86 /Oradata/2nd_fdc/TS_DATA68.dbf        29980      21958  8022.9375 alter database datafile '/Oradata/2nd_fdc/TS_DATA68.dbf' resize 21958M;
   92 /Oradata/2nd_fdc/TS_DATA72.dbf        30720      21246   9474.875 alter database datafile '/Oradata/2nd_fdc/TS_DATA72.dbf' resize 21246M;
   93 /Oradata/2nd_fdc/TS_DATA73.dbf        30720      20626  10094.875 alter database datafile '/Oradata/2nd_fdc/TS_DATA73.dbf' resize 20626M;

4. 结论

本次表空间高水位线收缩动作共释放50G左右空间。
通过合理地收缩表空间高水位，不仅可以有效释放磁盘空间，还能优化数据库的存储结构，提升整体性能表现。在实际运维过程中，掌握Shrinking、Move、Rebuild等手段的适用场景与操作细节，能够帮助我们更高效地解决空间浪费问题。希望本文提供的实践操作和经验总结，能为广大DBA在日常维护中提供借鉴与参考。

数据库管理虽无银弹，但精益求精的每一步，终将让系统更加稳定、可靠、高效。