–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. 查看所有用戶的表
select owner, table_name, tablespace_name from all_tables
–4. 查看當前用戶表
select table_name, tablespace_name from user_tables
–5. 查看用戶表索引
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. 查看唯一性約束
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 = 外鍵引用表的鍵名
–9. 查看表的列屬性
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. 查看所有表空間
select tablespace_name from dba_data_files group by tablespace_name
############################################
–1. 查看oracle最大連接數
sql>show parameter processes #最大連接數
–2. 修改最大連接數
sql>alter system set processes=value scope=spfile
–重啟數據庫
sql>shutdown force
sql>start force
–3. 查看當前連接數
sql>select * from v$session where username is not null
–4. 查看不同用戶的連接數
sql>select username,count(username) from v$session where username is not null group by username #查看指定用戶的連接數
–5. 查看活動的連接數
sql>select count(*) from v$session where status='active' #查看並發連接數
–6. 查看指定程序的連接數
sql>select count(*) from v$session where program='jdbc thin client' #查看jdbc連接oracle的數目
–7. 查看數據庫安裝實例(dba權限)
sql>select * from v$instance
–8. 查看運行實例名
sql>show parameter instance_name
–9. 查看數據庫名
sql>show parameter db_name
–10. 查看數據庫域名
sql>show parameter db_domain
–11. 查看數據庫服務名
sql>show parameter service_names
–12. 查看全局數據庫名
sql>show parameter global
–13. 查看表空間使用率
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-- (1)
select
dbf.tablespace_name,
dbf.totalspace
"總量(m)"
,
dbf.totalblocks
as
"總塊數"
,
dfs.freespace
"剩余總量(m)"
,
dfs.freeblocks
"剩余塊數"
,
(dfs.freespace / dbf.totalspace) * 100
as
"空閑比例"
from
(
select
t.tablespace_name,
sum
(t.bytes) / 1024 / 1024 totalspace,
sum
(t.blocks) totalblocks
from
dba_data_files t
group
by
t.tablespace_name) dbf,
(
select
tt.tablespace_name,
sum
(tt.bytes) / 1024 / 1024 freespace,
sum
(tt.blocks) freeblocks
from
dba_free_space tt
group
by
tt.tablespace_name) dfs
where
trim(dbf.tablespace_name) = trim(dfs.tablespace_name)
-- (2)
select
t.
name
"tablespace name"
,
free_space,
(total_space - free_space) used_space,
total_space
from
(
select
tablespace_name,
sum
(bytes / 1024 / 1024) free_space
from
sys.dba_free_space
group
by
tablespace_name)
free
,
(
select
b.
name
,
sum
(bytes / 1024 / 1024) total_space
from
sys.v_$datafile a, sys.v_$tablespace b
where
a.ts# = b.ts#
group
by
b.
name
) t
where
free
.tablespace_name = t.
name
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