oracle 缩小数据文件大小
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set verify off col value format a20 column file_name format a50 word_wrapped column smallest format 999,990 heading "Smallest|Size|Poss." column currsize format 999,990 heading "Current|Size" column savings format 999,990 heading "Poss.|Savings" break on report compute sum of savings on report column value new_val blksize select value from v$parameter where name = 'db_block_size' / select file_name, ceil( (nvl(hwm,1)*&&blksize)/1024/1024 ) smallest, ceil( blocks*&&blksize/1024/1024) currsize, ceil( blocks*&&blksize/1024/1024) - ceil( (nvl(hwm,1)*&&blksize)/1024/1024 ) savings from dba_data_files a, ( select file_id, max(block_id+blocks-1) hwm from dba_extents group by file_id ) b where a.file_id = b.file_id(+) / column cmd format a75 word_wrapped set heading off feedback off termout off spool /tmp/tmp_shrink_data_files.sql select 'alter database datafile '''||file_name||''' resize ' || ceil( (case when nvl(hwm,100)>=10240 then nvl(hwm,100) else 10240 end*&&blksize)/1024/1024 ) || 'm;' cmd from dba_data_files a, ( select file_id, max(block_id+blocks-1) hwm from dba_extents group by file_id ) b where a.file_id = b.file_id(+) and ceil( blocks*&&blksize/1024/1024) - ceil( (nvl(hwm,100)*&&blksize)/1024/1024 ) > 0 / spool off; set heading on feedback on termout on @/tmp/tmp_shrink_data_files.sql |