檢視歸檔日誌是否開啟
archive log list;
檢視預設表空間
select default_tablespace from user_users;
修改預設永久表空間
alter database default tablespace tablespacename
修改零時預設表空間
alter database default temporary tablespace tablespacename
檢視所有表空間名稱
select tablespace_name from user_tablespaces；
檢視資料庫例項名
select instance_name from v$instance;
檢視資料庫服務名
select name from v$database;
查詢正在執行的oracle語句
select a.username, a.sid,b.sql_text, b.sql_fulltext from v$session a, v$sqlarea b where a.sql_address = b.address;
查詢表空間資料檔案使用情況
select
b.file_id,
b.tablespace_name,
b.bytes/1024/1024||'m',
(b.bytes-sum(nvl(a.bytes,0)))/1024/1024||'m',
sum(nvl(a.bytes,0))/1024/1024||'m',
100 - sum(nvl(a.bytes,0))/(b.bytes)*100
from dba_free_space a,dba_data_files b
where a.file_id=b.file_id
group by b.tablespace_name,b.file_id,b.bytes
order by b.file_id;
列出使用頻率最高的5個查詢：
select sql_text,executions
from (select sql_text,executions,
rank() over
(order by executions desc) exec_rank
from v$sql)
where exec_rank <=5;
消耗磁碟讀取最多的sql top5：
select disk_reads,sql_text
from (select sql_text,disk_reads,
dense_rank() over
(order by disk_reads desc) disk_reads_rank
from v$sql)
where disk_reads_rank <=5;
找出需要大量緩衝讀取（邏輯讀）操作的查詢：
select buffer_gets,sql_text
from (select sql_text,buffer_gets,
dense_rank() over
(order by buffer_gets desc) buffer_gets_rank
from v$sql)
where buffer_gets_rank<=5;
查詢cpu使用率最高的10條語句
select * from (select sql_text,sql_id,cpu_time from v$sql order by cpu_time desc) where rownum<=10 order by rownum asc ;
select * from (select sql_text,sql_id,cpu_time from v$sqlarea order by cpu_time desc) where rownum<=10 order by rownum asc ;
占用cpu及時間最長的語句
select
a.username, a.command, a.status,
a.program, a.machine, a.client_identifier,
b.sql_text,
b.cpu_time,
b.sharable_mem,
round((b.disk_reads + b.buffer_gets)/b.executions)
as resource_cost
from
v$session a,
v$sqlstats b
where
a.sql_id = b.sql_id
and b.executions >0
and a.wait_class <> 'idle'
order by
resource_cost desc;
歸檔日誌的清理
su - oracle
rman target /
crosscheck archivelog all;
delete expired archivelog all;
delete force archivelog all completed before 'sysdate-7';(指定刪除7天前的歸檔日誌)
備份資料庫
rman target/
backup databaseplus archivelog delete input format '/dbbackup/phycal/full_%u.bak';
還原小貸資料庫：
tar -xjvf creditfull_20171214.tar.bz2 -c ./ ----解壓檔案
impdp credit/123456 directory=dpump_dir dumpfile=creditfull_20171026.dmp schemas=credit table_exists_action=replace
還原資料庫
impdp test/test directory=dmp dumpfile=creditfull_20180810.dmp logfile=export_201808102201.log schemas=credit transform=segment_attributes:n table_exists_action=replace skip_unusable_indexes=y
檢視oracle邏輯目錄
select * from dba_directories;
建立邏輯目錄
create directory dmp as '/oracle/dmp'
資料幫浦備份指令碼
#!/bin/bash
source /home/oracle/.bash_profile
time=`date "+%y%m%d"`
expdp test/test schemas=test dumpfile=creditfull_$time.dmp directory=dmp
echo $time
#mv /oralog/dmp/creditfull.dmp /oralog/dmp/creditfull_$time.dmp
mv /oralog/dmp/export.log /oralog/dmp/export_$time.log
tar cjvf /oralog/dmp/creditfull_$time.tar.bz2 /oralog/dmp/creditfull_$time.dmp
rm /oralog/dmp/creditfull_$time.dmp -rf
find /oralog/dmp/ -mtime +5 -exec rm -f {} \;
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