例如，Oracle 数据库中，发生了 SYSAUX 表空间过大的情况，如何查找到哪些对象占据了较多的空间呢。可以使用如下的语句：
COL SEGMENT_NAME FORMAT A30 COL OWNER FORMAT A10 COL TABLESPACE_NAME FORMAT A10 COL SEGMENT_TYPE FORMAT A15 SELECT * FROM (SELECT SEGMENT_NAME,OWNER,TABLESPACE_NAME,BYTES/1024/1024 "SIZE(MB)",SEGMENT_TYPE FROM DBA_SEGMENTS WHERE TABLESPACE_NAME='SYSAUX' ORDER BY BYTES DESC) WHERE ROWNUM<=20;
下面是一个结果的例子：
SEGMENT_NAME OWNER TABLESPACE SIZE(MB) SEGMENT_TYPE ------------------------------ ---------- ---------- ---------- --------------- I_WRI$_OPTSTAT_H_OBJ#_ICOL#_ST SYS SYSAUX 200 INDEX I_WRI$_OPTSTAT_H_ST SYS SYSAUX 104 INDEX SYS_LOB0000007350C00005$$ SYS SYSAUX 88.1875 LOBSEGMENT SYS_LOB0000067470C00006$$ MDSYS SYSAUX 50.1875 LOBSEGMENT I_WRI$_OPTSTAT_HH_OBJ_ICOL_ST SYS SYSAUX 31 INDEX WRH$_SYSMETRIC_HISTORY_INDEX SYS SYSAUX 23 INDEX WRH$_SYSMETRIC_HISTORY SYS SYSAUX 19 TABLE PARTITION SYS_LOB0000069706C00004$$ SYS SYSAUX 17.1875 LOBSEGMENT I_WRI$_OPTSTAT_HH_ST SYS SYSAUX 15 INDEX SCHEDULER$_EVENT_LOG SYS SYSAUX 10 TABLE WRI$_OPTSTAT_HISTGRM_HISTORY SYS SYSAUX 10 TABLE PARTITION WRI$_OPTSTAT_OPR_TASKS SYS SYSAUX 9 TABLE SDO_CS_SRS MDSYS SYSAUX 9 TABLE WRI$_OPTSTAT_HISTGRM_HISTORY SYS SYSAUX 9 TABLE PARTITION SYS_LOB0000070658C00002$$ MDSYS SYSAUX 8.1875 LOBSEGMENT SYS_LOB0000007350C00004$$ SYS SYSAUX 7.1875 LOBSEGMENT SYS_LOB0000069691C00004$$ SYS SYSAUX 7.1875 LOBSEGMENT SYS_LOB0000010641C00038$$ SYS SYSAUX 7.1875 LOBSEGMENT WRH$_SQL_PLAN SYS SYSAUX 5 TABLE I_WRI$_OPTSTAT_OPR_TASKS_TGST SYS SYSAUX 5 INDEX