查看表空间使用的两条常用SQL
时间:2022-03-14 03:31
1. 查看表空间大小:
SELECT tablespace_name, SUM(bytes)/1024/1024 total FROM DBA_FREE_SPACE GROUP BY tablespace_name ORDER BY 2 DESC;
SQL> SELECT tablespace_name, SUM(bytes)/1024/1024 || ‘MB‘ total FROM DBA_FREE_SPACE GROUP BY tablespace_name ORDER BY 2 DESC;
注意下上面两条SQL的排序,显然第一条SQL是我们需要的结果,按照表空间大小降序排列。之所以第二条SQL的排序乱,是因为使用了|| ‘MB‘连接字符串,则这个字段就作为字符串类型检索,排序时就会按照字符的ASCII进行排序。
2. 查看表空间使用率:
SQL>BREAK ON REPORT SQL>COMPUT SUM OF tbsp_size ON REPORT SQL>compute SUM OF used ON REPORT SQL>compute SUM OF free ON REPORT
SQL>COL tbspname FORMAT a20 HEADING ‘Tablespace Name‘ SQL>COL tbsp_size FORMAT 999,999 HEADING ‘Size|(MB)‘ SQL>COL used FORMAT 999,999 HEADING ‘Used|(MB)‘ SQL>COL free FORMAT 999,999 HEADING ‘Free|(MB)‘ SQL>COL pct_used FORMAT 999,999 HEADING ‘% Used‘
SQL>SELECT df.tablespace_name tbspname, sum(df.bytes)/1024/1024 tbsp_size, nvl(sum(e.used_bytes)/1024/1024,0) used, nvl(sum(f.free_bytes)/1024/1024,0) free, nvl((sum(e.used_bytes)*100)/sum(df.bytes),0) pct_used FROM DBA_DATA_FILES df, (SELECT file_id, SUM(nvl(bytes, 0)) used_bytes FROM dba_extents GROUP BY file_id) e, (SELECT MAX(bytes) free_bytes, file_id FROM dba_free_space GROUP BY file_id) f WHERE e.file_id(+) = df.file_id AND df.file_id = f.file_id(+) GROUP BY df.tablespace_name ORDER BY 5 DESC;
视图定义: