查看歸檔日誌是否打開
archive log list;
查看默認表空間
select default_tablespace from user_users;
修改默認永久表空間
alter database default tablespace tablespaceName
修改零時默認表空間
alter database default temporary tablespace tablespaceName
查看所有表空間名稱
select tablespace_name from user_tablespaces；
查看數據庫實例名
select instance_name from v$instance;
查看數據庫服務名
select name from v$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;
增加用戶表空間文件
alter tablespace users add datafile '/home/u01/app/oracle/oradata/orcl/users04.dbf' size 10240m autoextend on next 500m maxsize unlimited; unlimited最大支持32G
查詢表空間數據文件使用情況 https://blog.csdn.net/michaelzhou224/article/details/20688365
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$sql)
where exec_rank <=5;
消耗磁盤讀取最多的sql top5：
select disk_reads,sql_text
from (select sql_text,disk_reads,
dense_rank() over
(order by disk_reads desc) disk_reads_rank
from v$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$sqlarea order by cpu_time desc) where rownum<=10 order by rownum asc ;
佔用cpu及時間最長的語句
SELECT
A.USERNAME, A.COMMAND, A.STATUS,
A.PROGRAM, A.MACHINE, A.CLIENT_IDENTIFIER,
B.SQL_TEXT,
B.CPU_TIME,
B.SHARABLE_MEM,
ROUND((B.DISK_READS + B.BUFFER_GETS)/B.EXECUTIONS)
AS RESOURCE_COST
FROM
V$SESSION A,
V$SQLSTATS B
WHERE
A.SQL_ID = B.SQL_ID
AND B.EXECUTIONS >0
AND A.WAIT_CLASS <> 'Idle'
ORDER BY
RESOURCE_COST DESC;
歸檔日誌的清理
su - oracle
rman target /
crosscheck archivelog all;
delete expired archivelog all;
DELETE FORCE ARCHIVELOG ALL COMPLETED BEFORE 'SYSDATE-7';(指定刪除7天前的歸檔日誌)
備份數據庫
rman target/
backup databaseplus archivelog delete input format '/DBBackup/Phycal/full_%U.bak';
還原小貸數據庫：
tar -xjvf creditfull_20171214.tar.bz2 -C ./ ----解壓文件
impdp credit/123456 directory=dpump_dir dumpfile=creditfull_20171026.dmp schemas=credit table_exists_action=replace
還原數據庫
impdp test/test directory=dmp dumpfile=creditfull_20180810.dmp logfile=export_201808102201.log schemas=credit transform=segment_attributes:n table_exists_action=replace SKIP_UNUSABLE_INDEXES=Y
查看oracle邏輯目錄
select * from dba_directories;
創建邏輯目錄
create directory dmp as '/oracle/dmp'
數據泵備份腳本
#!/bin/bash
source /home/oracle/.bash_profile
time=`date "+%Y%m%d"`
expdp test/test schemas=test dumpfile=creditfull_$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 {} \;