標籤:blog color io os 使用 ar strong for 資料
Oracle DBA常用查詢
–1. 查詢系統所有對象
select owner, object_name, object_type, created, last_ddl_time, timestamp, status
from dba_objects
where owner=upper(‘scott‘)
–2. 查看系統所有表
select owner, table_name, tablespace_name from dba_tables
–3. 查看所有使用者的表
select owner, table_name, tablespace_name from all_tables
–4. 查看目前使用者表
select table_name, tablespace_name from user_tables
–5. 查看使用者表索引
select t.*,i.index_type from user_ind_columns t, user_indexes i where
t.index_name = i.index_name and t.table_name = i.table_name
and t.table_name = 要查詢的表
–6. 查看主鍵
select cu.* from user_cons_columns cu, user_constraints au
where cu.constraint_name = au.constraint_name
and au.constraint_type = upper(‘p‘) and au.table_name = 要查詢的表
–7. 查看唯一性限制式
select column_name from user_cons_columns cu, user_constraints au
where cu.constraint_name = au.constraint_name and au.constraint_type = upper(‘u‘)
and au.table_name = 要查詢的表
–8. 查看外鍵
select * from user_constraints c where c.constraint_type = ‘r‘ and c.table_name = 要查詢的表
select * from user_cons_columns cl where cl.constraint_name = 外鍵名稱
select * from user_cons_columns cl where cl.constraint_name = 外鍵參考資料表的鍵名
–9. 查看錶的列屬性
select t.*,c.comments
from user_tab_columns t, user_col_comments c
where t.table_name = c.table_name and t.column_name = c.column_name and t.table_name = 要查詢的表
–10. 查看所有資料表空間
select tablespace_name from dba_data_files group by tablespace_name
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–1. 查看oracle最大串連數
sql>show parameter processes #最大串連數
–2. 修改最大串連數
sql>alter system set processes=value scope=spfile
–重啟資料庫
sql>shutdown force
sql>start force
–3. 查看當前串連數
sql>select * from v$session where username is not null
–4. 查看不同使用者的串連數
sql>select username,count(username) from v$session where username is not null group by username #查看指定使用者的串連數
–5. 查看活動的串連數
sql>select count(*) from v$session where status=‘active‘ #查看並發串連數
–6. 查看指定程式的串連數
sql>select count(*) from v$session where program=‘jdbc thin client‘ #查看jdbc串連oracle的數目
–7. 強行斷開使用者串連的方法
sql>select sid,serial# from v$session where username=‘ERP‘;(注意:serial# 中的 # 不能漏掉)
sql>alter system kill session ‘sid,serial‘;(select 可能會返回多條記錄,所以alter也要執行多次!)
–7. 查看資料庫安裝執行個體(dba許可權)
sql>select * from v$instance
–8. 查看運行執行個體名
sql>show parameter instance_name
–9. 查看資料庫名
sql>show parameter db_name
–10. 查看資料庫網域名稱
sql>show parameter db_domain
–11. 查看資料庫服務名
sql>show parameter service_names
–12. 查看全域資料庫名
sql>show parameter global
–13. 查看錶空間使用率
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-- (1) select dbf.tablespace_name, dbf.totalspace "總量(m)" , dbf.totalblocks as "總塊數" , dfs.freespace "剩餘總量(m)" , dfs.freeblocks "剩餘塊數" , (dfs.freespace / dbf.totalspace) * 100 as "空閑比例" from ( select t.tablespace_name, sum (t.bytes) / 1024 / 1024 totalspace, sum (t.blocks) totalblocks from dba_data_files t group by t.tablespace_name) dbf, ( select tt.tablespace_name, sum (tt.bytes) / 1024 / 1024 freespace, sum (tt.blocks) freeblocks from dba_free_space tt group by tt.tablespace_name) dfs where trim(dbf.tablespace_name) = trim(dfs.tablespace_name) -- (2) select t. name "tablespace name" , free_space, (total_space - free_space) used_space, total_space from ( select tablespace_name, sum (bytes / 1024 / 1024) free_space from sys.dba_free_space group by tablespace_name) free , ( select b. name , sum (bytes / 1024 / 1024) total_space from sys.v_$datafile a, sys.v_$tablespace b where a.ts# = b.ts# group by b. name ) t where free .tablespace_name = t. name |
Oracle DBA常用查詢