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数据文件从系统文件迁移到asm的操作专栏

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select file_name ,tablespace_name from dba_data_files ;

FILE_NAME TABLESPACE_NAME
--------------------------------------------- ------------------------------
+DATA/rac/datafile/system.259.926647219 SYSTEM
+DATA/rac/datafile/sysaux.260.926647323 SYSAUX
+DATA/rac/datafile/undotbs1.261.926647405 UNDOTBS1
+DATA/rac/datafile/undotbs2.263.926647467 UNDOTBS2
+DATA/rac/datafile/users.264.926647499 USERS
+DATA/rac/datafile/admin_tbs.274.927927081 ADMIN_TBS
+DATA/rac/datafile/admin_tb2.275.927927171 ADMIN_TB2
+DATA/rac/datafile/tbs_low_freq.276.927939255 TBS_LOW_FREQ
/oracle/app/oracle/11.2/db_1/dbs/q1_orders Q1_ORDERS
/oracle/app/oracle/11.2/db_1/dbs/q2_orders Q2_ORDERS
/oracle/app/oracle/11.2/db_1/dbs/q3_orders Q3_ORDERS
/oracle/app/oracle/11.2/db_1/dbs/q4_orders Q4_ORDERS
/oracle/app/oracle/11.2/db_1/dbs/2006_orders 2006_ORDERS
/oracle/app/oracle/11.2/db_1/dbs/2005_orders 2005_ORDERS
/oracle/app/oracle/11.2/db_1/dbs/2004_orders 2004_ORDERS
/oracle/app/oracle/11.2/db_1/dbs/old_orders OLD_ORDERS
/oracle/app/oracle/11.2/db_1/dbs/cc_this_mont CC_THIS_MONTH

数据文件都节点1本地。

案例重演：
sys@RAC> show parameter db_create_file_dest

NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
db_create_file_dest string +DATA

采用了omf管理
sys@RAC> create tablespace qn datafile size 20m ;

Tablespace created.

sys@RAC> select file_name ,tablespace_name from dba_data_files ;

FILE_NAME TABLESPACE_NAME
--------------------------------------------- ------------------------------
.........
+DATA/rac/datafile/qn.277.928807173 QN
此时发现数据文件qn建在ASM存储上

sys@RAC> create tablespace qn2 datafile 'qn2' size 20m ;
Tablespace created.
sys@RAC> select file_name ,tablespace_name from dba_data_files ;

FILE_NAME TABLESPACE_NAME
--------------------------------------------- ------------------------------
/oracle/app/oracle/11.2/db_1/dbs/cc_prev_12 CC_PREV_12MTH
/oracle/app/oracle/11.2/db_1/dbs/cc_old_tran CC_OLD_TRAN
+DATA/rac/datafile/qn.277.928807173 QN
/oracle/app/oracle/11.2/db_1/dbs/qn2 QN2
此时发现数据文件qn2建在系统文件上,这样会出问题的，其节点报错。

那么如何把这个数据库的系统文件迁移到ASM上呢？

在线迁移数据文件至ASM上：

1. offline数据文件
select file_name ,tablespace_name from dba_data_files where tablespace_name in ('Q1_ORDERS','Q2_ORDERS','Q3_ORDERS','Q4_ORDERS','2006_ORDERS','2005_ORDERS','2004_ORDERS','OLD_ORDERS','CC_THIS_MONTH','CC_PREV_MONTH','CC_PREV_12MTH','QN2' ) ;
FILE_NAME TABLESPACE_NAME
------------------------------------------------------------ ------------------------------
/oracle/app/oracle/11.2/db_1/dbs/q1_orders Q1_ORDERS
/oracle/app/oracle/11.2/db_1/dbs/q2_orders Q2_ORDERS
/oracle/app/oracle/11.2/db_1/dbs/q3_orders Q3_ORDERS
/oracle/app/oracle/11.2/db_1/dbs/q4_orders Q4_ORDERS
/oracle/app/oracle/11.2/db_1/dbs/2006_orders 2006_ORDERS
/oracle/app/oracle/11.2/db_1/dbs/2005_orders 2005_ORDERS
/oracle/app/oracle/11.2/db_1/dbs/2004_orders 2004_ORDERS
/oracle/app/oracle/11.2/db_1/dbs/old_orders OLD_ORDERS
/oracle/app/oracle/11.2/db_1/dbs/cc_this_month CC_THIS_MONTH
/oracle/app/oracle/11.2/db_1/dbs/cc_prev_month CC_PREV_MONTH
/oracle/app/oracle/11.2/db_1/dbs/cc_prev_12 CC_PREV_12MTH
/oracle/app/oracle/11.2/db_1/dbs/qn2 QN2

2. rman copy
alter tablespace Q1_ORDERS offline ;

backup as copy datafile '/oracle/app/oracle/11.2/db_1/dbs/q1_orders' format '+DATA';
or
copy datafile '/oracle/app/oracle/11.2/db_1/dbs/q1_orders' to '+DATA';

RMAN> copy datafile '/oracle/app/oracle/11.2/db_1/dbs/q1_orders' to '+DATA';

Starting backup at 2016-11-25 02:55:42
using target database control file instead of recovery catalog
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=28 instance=rac1 device type=DISK
channel ORA_DISK_1: starting datafile copy
input datafile file number=00009 name=/oracle/app/oracle/11.2/db_1/dbs/q1_orders
output file name=+DATA/rac/datafile/q1_orders.278.928810547 tag=TAG20161125T025546 RECID=1 STAMP=928810550
channel ORA_DISK_1: datafile copy complete, elapsed time: 00:00:03
Finished backup at 2016-11-25 02:55:50

3. rename
alter database rename file 'D:\NSOADP\SYSTEM01.DBF' to '+ORADATA/nsoa/datafile/system.260.877082571';
or
switch datafile 37 to copy;

RMAN> switch datafile '/oracle/app/oracle/11.2/db_1/dbs/q1_orders' to copy ;
datafile 9 switched to datafile copy "+DATA/rac/datafile/q1_orders.278.928810547"

4. recover
recover datafile '+DATA/rac/datafile/q1_orders.278.928810547';

5. online
alter tablespace Q1_ORDERS online

sys@RAC> select file_name ,tablespace_name from dba_data_files where tablespace_name in ('Q1_ORDERS')
2 /

FILE_NAME TABLESPACE_NAME
------------------------------------------------------------ ------------------------------
+DATA/rac/datafile/q1_orders.278.928810547 Q1_ORDERS

快速恢复:
sys@RAC> select file_name ,tablespace_name from dba_data_files where tablespace_name in ('Q2_ORDERS','Q3_ORDERS','Q4_ORDERS','2006_ORDERS','2005_ORDERS','2004_ORDERS','OLD_ORDERS','CC_THIS_MONTH','CC_PREV_MONTH','CC_PREV_12MTH','QN2' ) ;

FILE_NAME TABLESPACE_NAME
------------------------------------------------------------ ------------------------------
/oracle/app/oracle/11.2/db_1/dbs/q2_orders Q2_ORDERS
/oracle/app/oracle/11.2/db_1/dbs/q3_orders Q3_ORDERS
/oracle/app/oracle/11.2/db_1/dbs/q4_orders Q4_ORDERS
/oracle/app/oracle/11.2/db_1/dbs/2006_orders 2006_ORDERS
/oracle/app/oracle/11.2/db_1/dbs/2005_orders 2005_ORDERS
/oracle/app/oracle/11.2/db_1/dbs/2004_orders 2004_ORDERS
/oracle/app/oracle/11.2/db_1/dbs/old_orders OLD_ORDERS
/oracle/app/oracle/11.2/db_1/dbs/cc_this_month CC_THIS_MONTH
/oracle/app/oracle/11.2/db_1/dbs/cc_prev_month CC_PREV_MONTH
/oracle/app/oracle/11.2/db_1/dbs/cc_prev_12 CC_PREV_12MTH
/oracle/app/oracle/11.2/db_1/dbs/qn2 QN2

sys@RAC> select 'alter tablespace '|| tablespace_name||' offline;' from dba_data_files where tablespace_name in ('Q2_ORDERS','Q3_ORDERS','Q4_ORDERS','2006_ORDERS','2005_ORDERS','2004_ORDERS','OLD_ORDERS','CC_THIS_MONTH','CC_PREV_MONTH','CC_PREV_12MTH','QN2' ) ;

'ALTERTABLESPACE'||TABLESPACE_NAME||'OFFLINE;'
--------------------------------------------------------
alter tablespace Q2_ORDERS offline;
alter tablespace Q3_ORDERS offline;
alter tablespace Q4_ORDERS offline;
alter tablespace 2006_ORDERS offline;
alter tablespace 2005_ORDERS offline;
alter tablespace 2004_ORDERS offline;
alter tablespace OLD_ORDERS offline;
alter tablespace CC_THIS_MONTH offline;
alter tablespace CC_PREV_MONTH offline;
alter tablespace CC_PREV_12MTH offline;
alter tablespace QN2 offline;

sys@RAC> sys@RAC> alter tablespace Q2_ORDERS offline;
alter tablespace Q3_ORDERS offline;
alter tablespace Q4_ORDERS offline;
alter tablespace 2006_ORDERS offline;
alter tablespace 2005_ORDERS offline;
alter tablespace 2004_ORDERS offline;
alter tablespace OLD_ORDERS offline;
alter tablespace CC_THIS_MONTH offline;
alter tablespace CC_PREV_MONTH offline;
alter tablespace CC_PREV_12MTH offline;
alter tablespace QN2 offline;

sys@RAC> alter tablespace "2006_ORDERS" offline
*
ERROR at line 1:
ORA-02140: invalid tablespace name

sys@RAC> alter tablespace 2005_ORDERS offline
*
ERROR at line 1:
ORA-02140: invalid tablespace name

sys@RAC> alter tablespace 2004_ORDERS offline
*
ERROR at line 1:
ORA-02140: invalid tablespace name

alter tablespace "2004_ORDERS" offline;
alter tablespace "2005_ORDERS" offline;
alter tablespace "2006_ORDERS" offline;

select 'copy datafile '''||file_name||''' to ''+DATA'';' from dba_data_files where tablespace_name in ('Q2_ORDERS','Q3_ORDERS','Q4_ORDERS','2006_ORDERS','2005_ORDERS','2004_ORDERS','OLD_ORDERS','CC_THIS_MONTH','CC_PREV_MONTH','CC_PREV_12MTH','QN2' ) ;

'COPYDATAFILE'''||FILE_NAME||'''TO''+DATA'';'
----------------------------------------------------------------------------------------------------------------------------------------------------------
copy datafile '/oracle/app/oracle/11.2/db_1/dbs/q2_orders' to '+DATA';
copy datafile '/oracle/app/oracle/11.2/db_1/dbs/q3_orders' to '+DATA';
copy datafile '/oracle/app/oracle/11.2/db_1/dbs/q4_orders' to '+DATA';
copy datafile '/oracle/app/oracle/11.2/db_1/dbs/2006_orders' to '+DATA';
copy datafile '/oracle/app/oracle/11.2/db_1/dbs/2005_orders' to '+DATA';
copy datafile '/oracle/app/oracle/11.2/db_1/dbs/2004_orders' to '+DATA';
copy datafile '/oracle/app/oracle/11.2/db_1/dbs/old_orders' to '+DATA';
copy datafile '/oracle/app/oracle/11.2/db_1/dbs/cc_this_month' to '+DATA';
copy datafile '/oracle/app/oracle/11.2/db_1/dbs/cc_prev_month' to '+DATA';
copy datafile '/oracle/app/oracle/11.2/db_1/dbs/cc_prev_12' to '+DATA';
copy datafile '/oracle/app/oracle/11.2/db_1/dbs/qn2' to '+DATA';

RMAN> copy datafile '/oracle/app/oracle/11.2/db_1/dbs/q2_orders' to '+DATA';
copy datafile '/oracle/app/oracle/11.2/db_1/dbs/q3_orders' to '+DATA';
copy datafile '/oracle/app/oracle/11.2/db_1/dbs/q4_orders' to '+DATA';
copy datafile '/oracle/app/oracle/11.2/db_1
/dbs/2006_orders' to '+DATA';
copy datafile '/oracle/app/oracle/11.2/db_1/dbs/2005_orders' to '+DATA';
copy datafile '/oracle/app/oracle/11.2/db_1/dbs/2004_orders' to '+DATA';
copy datafile '/oracle/app/oracle/11.2/db_1/dbs/old_orders' to '+DATA';
copy datafile '/oracle/app/oracle/11.2/db_1/dbs/cc_this_month' to '+DATA';
copy datafile '/oracle/app/oracle/11.2/db_1/dbs/cc_prev_month' to '+DATA';
copy datafile '/oracle/app/oracle/11.2/db_1/dbs/cc_prev_12' to '+DATA';
copy datafile '/oracle/app/oracle/11.2/db_1/dbs/qn2' to '+DATA';Starting backup at 2016-11-25 03:20:57
using channel ORA_DISK_1
channel ORA_DISK_1: starting datafile copy
input datafile file number=00010 name=/oracle/app/oracle/11.2/db_1/dbs/q2_orders
output file name=+DATA/rac/datafile/q2_orders.279.928812061 tag=TAG20161125T032059 RECID=3 STAMP=928812062
channel ORA_DISK_1: datafile copy complete, elapsed time: 00:00:03
Finished backup at 2016-11-25 03:21:02

RMAN>
Starting backup at 2016-11-25 03:21:08
using channel ORA_DISK_1
channel ORA_DISK_1: starting datafile copy
input datafile file number=00011 name=/oracle/app/oracle/11.2/db_1/dbs/q3_orders
output file name=+DATA/rac/datafile/q3_orders.280.928812071 tag=TAG20161125T032109 RECID=4 STAMP=928812073
channel ORA_DISK_1: datafile copy complete, elapsed time: 00:00:07
Finished backup at 2016-11-25 03:21:17

RMAN>
Starting backup at 2016-11-25 03:21:22
using channel ORA_DISK_1
channel ORA_DISK_1: starting datafile copy
input datafile file number=00012 name=/oracle/app/oracle/11.2/db_1/dbs/q4_orders
output file name=+DATA/rac/datafile/q4_orders.281.928812085 tag=TAG20161125T032124 RECID=5 STAMP=928812088
channel ORA_DISK_1: datafile copy complete, elapsed time: 00:00:03
Finished backup at 2016-11-25 03:21:28

RMAN>
Starting backup at 2016-11-25 03:21:33
using channel ORA_DISK_1
channel ORA_DISK_1: starting datafile copy
input datafile file number=00013 name=/oracle/app/oracle/11.2/db_1/dbs/2006_orders
output file name=+DATA/rac/datafile/2006_orders.282.928812095 tag=TAG20161125T032134 RECID=6 STAMP=928812099
channel ORA_DISK_1: datafile copy complete, elapsed time: 00:00:07
Finished backup at 2016-11-25 03:21:42

RMAN>
Starting backup at 2016-11-25 03:21:46
using channel ORA_DISK_1
channel ORA_DISK_1: starting datafile copy
input datafile file number=00014 name=/oracle/app/oracle/11.2/db_1/dbs/2005_orders
output file name=+DATA/rac/datafile/2005_orders.283.928812109 tag=TAG20161125T032148 RECID=7 STAMP=928812112
channel ORA_DISK_1: datafile copy complete, elapsed time: 00:00:07
Finished backup at 2016-11-25 03:21:56

RMAN>
Starting backup at 2016-11-25 03:22:00
using channel ORA_DISK_1
channel ORA_DISK_1: starting datafile copy
input datafile file number=00015 name=/oracle/app/oracle/11.2/db_1/dbs/2004_orders
output file name=+DATA/rac/datafile/2004_orders.284.928812123 tag=TAG20161125T032202 RECID=8 STAMP=928812126
channel ORA_DISK_1: datafile copy complete, elapsed time: 00:00:07
Finished backup at 2016-11-25 03:22:10

RMAN>
Starting backup at 2016-11-25 03:22:14
using channel ORA_DISK_1
channel ORA_DISK_1: starting datafile copy
input datafile file number=00016 name=/oracle/app/oracle/11.2/db_1/dbs/old_orders
output file name=+DATA/rac/datafile/old_orders.285.928812137 tag=TAG20161125T032216 RECID=9 STAMP=928812141
channel ORA_DISK_1: datafile copy complete, elapsed time: 00:00:07
Finished backup at 2016-11-25 03:22:24

RMAN>
Starting backup at 2016-11-25 03:22:29
using channel ORA_DISK_1
channel ORA_DISK_1: starting datafile copy
input datafile file number=00017 name=/oracle/app/oracle/11.2/db_1/dbs/cc_this_month
output file name=+DATA/rac/datafile/cc_this_month.286.928812151 tag=TAG20161125T032231 RECID=10 STAMP=928812154
channel ORA_DISK_1: datafile copy complete, elapsed time: 00:00:03
Finished backup at 2016-11-25 03:22:34

RMAN>
Starting backup at 2016-11-25 03:22:45
using channel ORA_DISK_1
channel ORA_DISK_1: starting datafile copy
input datafile file number=00018 name=/oracle/app/oracle/11.2/db_1/dbs/cc_prev_month
output file name=+DATA/rac/datafile/cc_prev_month.287.928812167 tag=TAG20161125T032246 RECID=11 STAMP=928812167
channel ORA_DISK_1: datafile copy complete, elapsed time: 00:00:01
Finished backup at 2016-11-25 03:22:47

RMAN>
Starting backup at 2016-11-25 03:22:52
using channel ORA_DISK_1
channel ORA_DISK_1: starting datafile copy
input datafile file number=00019 name=/oracle/app/oracle/11.2/db_1/dbs/cc_prev_12
output file name=+DATA/rac/datafile/cc_prev_12mth.288.928812175 tag=TAG20161125T032253 RECID=12 STAMP=928812175
channel ORA_DISK_1: datafile copy complete, elapsed time: 00:00:03
Finished backup at 2016-11-25 03:22:57

Starting backup at 2016-11-25 03:26:09

RMAN>
using channel ORA_DISK_1
channel ORA_DISK_1: starting datafile copy
input datafile file number=00022 name=/oracle/app/oracle/11.2/db_1/dbs/qn2
output file name=+DATA/rac/datafile/qn2.289.928812371 tag=TAG20161125T032611 RECID=13 STAMP=928812376
channel ORA_DISK_1: datafile copy complete, elapsed time: 00:00:07
Finished backup at 2016-11-25 03:26:18

sys@RAC> select 'switch datafile '''||file_name||''' to copy;' from dba_data_files where tablespace_name in ('Q2_ORDERS','Q3_ORDERS','Q4_ORDERS','2006_ORDERS','2005_ORDERS','2004_ORDERS','OLD_ORDERS','CC_THIS_MONTH','CC_PREV_MONTH','CC_PREV_12MTH','QN2' ) ;

'SWITCHDATAFILE'''||FILE_NAME||'''TOCOPY;'
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
switch datafile '/oracle/app/oracle/11.2/db_1/dbs/q2_orders' to copy;
switch datafile '/oracle/app/oracle/11.2/db_1/dbs/q3_orders' to copy;
switch datafile '/oracle/app/oracle/11.2/db_1/dbs/q4_orders' to copy;
switch datafile '/oracle/app/oracle/11.2/db_1/dbs/2006_orders' to copy;
switch datafile '/oracle/app/oracle/11.2/db_1/dbs/2005_orders' to copy;
switch datafile '/oracle/app/oracle/11.2/db_1/dbs/2004_orders' to copy;
switch datafile '/oracle/app/oracle/11.2/db_1/dbs/old_orders' to copy;
switch datafile '/oracle/app/oracle/11.2/db_1/dbs/cc_this_month' to copy;
switch datafile '/oracle/app/oracle/11.2/db_1/dbs/cc_prev_month' to copy;
switch datafile '/oracle/app/oracle/11.2/db_1/dbs/cc_prev_12' to copy;
switch datafile '/oracle/app/oracle/11.2/db_1/dbs/qn2' to copy;

RMAN> switch datafile '/oracle/app/oracle/11.2/db_1/dbs/q2_orders' to copy;
switch datafile '/oracle/app/oracle/11.2/db_1/dbs/q3_orders' to copy;
switch datafile '/oracle/app/oracle/11.2/db_1/dbs/q4_orders' to copy;
switch datafile '/oracle/app/oracle/11.2/db_1/
dbs/2006_orders' to copy;
switch datafile '/oracle/app/oracle/11.2/db_1/dbs/2005_orders' to copy;
switch datafile '/oracle/app/oracle/11.2/db_1/dbs/2004_orders' to copy;
switch datafile '/oracle/app/oracle/11.2/db_1/dbs/old_orders' to copy;
switch datafile '/oracle/app/oracle/11.2/db_1/dbs/cc_this_month' to copy;
switch datafile '/oracle/app/oracle/11.2/db_1/dbs/cc_prev_month' to copy;
switch datafile '/oracle/app/oracle/11.2/db_1/dbs/cc_prev_12' to copy;
switch datafile '/oracle/app/oracle/11.2/db_1/dbs/qn2' to copy;
datafile 10 switched to datafile copy "+DATA/rac/datafile/q2_orders.279.928812061"
RMAN>
datafile 11 switched to datafile copy "+DATA/rac/datafile/q3_orders.280.928812071"
RMAN>
datafile 12 switched to datafile copy "+DATA/rac/datafile/q4_orders.281.928812085"
RMAN>
datafile 13 switched to datafile copy "+DATA/rac/datafile/2006_orders.282.928812095"
RMAN>
datafile 14 switched to datafile copy "+DATA/rac/datafile/2005_orders.283.928812109"
RMAN>
datafile 15 switched to datafile copy "+DATA/rac/datafile/2004_orders.284.928812123"
RMAN>
datafile 16 switched to datafile copy "+DATA/rac/datafile/old_orders.285.928812137"
RMAN>
datafile 17 switched to datafile copy "+DATA/rac/datafile/cc_this_month.286.928812151"
RMAN>
datafile 18 switched to datafile copy "+DATA/rac/datafile/cc_prev_month.287.928812167"
RMAN>
datafile 19 switched to datafile copy "+DATA/rac/datafile/cc_prev_12mth.288.928812175"
RMAN>
datafile 22 switched to datafile copy "+DATA/rac/datafile/qn2.289.928812371"

alter tablespace Q3_ORDERS online;
alter tablespace Q4_ORDERS online;
alter tablespace "2006_ORDERS" online;
alter tablespace "2005_ORDERS" online;
alter tablespace "2004_ORDERS" online;
alter tablespace OLD_ORDERS online;
alter tablespace CC_THIS_MONTH online;
alter tablespace CC_PREV_MONTH online;
alter tablespace CC_PREV_12MTH online;
alter tablespace QN2 online;

sys@RAC> select file_name ,tablespace_name from dba_data_files where tablespace_name in ('Q1_ORDERS','Q2_ORDERS','Q3_ORDERS','Q4_ORDERS','2006_ORDERS','2005_ORDERS','2004_ORDERS','OLD_ORDERS','CC_THIS_MONTH','CC_PREV_MONTH','CC_PREV_12MTH','QN2' ) ;
FILE_NAME TABLESPACE_NAME
------------------------------------------------------------ ------------------------------
+DATA/rac/datafile/q1_orders.278.928810547 Q1_ORDERS
+DATA/rac/datafile/q2_orders.279.928812061 Q2_ORDERS
+DATA/rac/datafile/q3_orders.280.928812071 Q3_ORDERS
+DATA/rac/datafile/q4_orders.281.928812085 Q4_ORDERS
+DATA/rac/datafile/2006_orders.282.928812095 2006_ORDERS
+DATA/rac/datafile/2005_orders.283.928812109 2005_ORDERS
+DATA/rac/datafile/2004_orders.284.928812123 2004_ORDERS
+DATA/rac/datafile/old_orders.285.928812137 OLD_ORDERS
+DATA/rac/datafile/cc_this_month.286.928812151 CC_THIS_MONTH
+DATA/rac/datafile/cc_prev_month.287.928812167 CC_PREV_MONTH
+DATA/rac/datafile/cc_prev_12mth.288.928812175 CC_PREV_12MTH
+DATA/rac/datafile/qn2.289.928812371 QN2

至此系统上的数据文件都迁移到asm上。

更多相关教程请访问 MySQL视频教程

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从入门到自闭之Python--MySQL数据库的单表操作【代码】

单表查询：select * from 表 where 条件 group by 分组 having 过滤 order by 排序 limit n;语法：select distinct 字段1，字段2... from 表名 where 条件 group by 组名 having 筛选 order by 排序 limit 限制条数找到表:from拿着where指定的约束条件，去文件/表中取出一条条记录将取出的一条条记录进行分组group by，如果没有group by，则整体作为一组执行select（去重）：select * from 表名;将分组的结果进行having过滤将结果按...

mysql大数据量下优化

1 优化sql和索引2 增加缓存如：redis3 主从复制或主主复制，读写分离4 利用mysql自带分区表5 先做垂直拆分，将一个大系统分为多个小系统，也就是分布式6 水平切分，要选择一个合理的sharding key,为了有好的查询效率，表结构也要改动，做一定的冗余，应用也要改，sql中尽量带sharding key，将数据定位到限定的表上去查，而不是扫描全部的表参考：https://www.cnblogs.com/nengka/p/mysqloptimization.html原文：https://www.cnblo...

jeecg数据库切换至mysql8.0方式【代码】

1、修改pom.xml mysql版本 <mysql.version>8.0.11</mysql.version>2、修改dbconfig.properties文件hibernate.dialect=org.hibernate.dialect.MySQL5Dialect jdbc.url.jeecg=jdbc:mysql://172.xx.xx.xx:3306/dbname?useUnicode=true&characterEncoding=UTF-8&serverTimezone=UTC&useSSL=false3、数据库连接池增加驱动 spring-mvc-hibernate.xml<property name="driverClassName" value="com.mysql.cj.jdbc.Driver"/> 以前版本的驱...

mysql - 日期数据类型

分类：类型名称日期格式日期范围存储需求YEARYYYY1901 ~ 21551 个字节TIMEHH:MM:SS-838:59:59 ~ 838:59:593 个字节DATEYYYY-MM-DD1000-01-01 ~ 9999-12-33 个字节DATETIMEYYYY-MM-DD HH:MM:SS1000-01-01 00:00:00 ~ 9999-12-31 23:59:598 个字节TIMESTAMPYYYY-MM-DD HH:MM:SS1980-01-01 00:00:01 UTC ~ 2040-01-19 03:14:07 UTC4 个字节DATETIME 类型DATETIME 类型用于需要同时包含日期和时间信息的值，在存储时需要 8 个字节。日...

备份mysql数据库【图】

使用navicate 使用命令备份mysqldump -hlocalhost -uroot -prootdatabases > C:\Users\asus008\Desktop\mp4\databases.sql还原mysql -hlocalhost -uroot -proot databases < C:\Users\asus008\Desktop\mp4\databases.sql备份多个数据库mysqldump -hlocalhost -uroot -proot --databases oa tele > C:\Users\asus008\Desktop\mp4\databasesf.sql备份所有数据库mysqldump --all -databases -hlocalhost -uroot -proot > C:\Users\as...

Ubuntu下取消MySQL数据库本机绑定限制方法

出现问题：在Ubuntu系统中，添加了MySQL账户，赋予了数据库完全操作权限，并且允许数据库从外部链接但是，还是无法远程访问MySQL数据库。原因：Ubuntu系统中，默认安装的MySQL限制了只有本机才能访问数据库解决办法：取消MySQL数据库的本机绑定限制nano /etc/mysql/my.cnf #编辑配置文件找到bind-address = 127.0.0.1改为#bind-address = 127.0.0.1ctrl+o #保存配置ctrl+x #退出/etc/init.d/mysql restart #重启数据库现在已经可以...

MySQL数据库web维护管理软件【图】

TreeSoft数据库管理系统使用JAVA开发，采用稳定通用的springMVC +JDBC架构，实现基于WEB方式对 MySQL，Oracle，PostgreSQL 等数据库进行维护管理操作。功能包括：数据库的展示,库表的展示，表字段结构的展示， SQL语句的在线编辑批量执行，表结构的在线设计维护，数据的在线编辑维护，查询语句保存，JSON数据格式化，SQL语法帮助，在线数据源选择配置等。系统内置14套UI皮肤，45套代码编辑区UI方案，使用中可以依个人喜好选择配...

如何删除MySQL表中的前10万条数据

给出以下几种方案：方案一：delete from t limit 100000; 直接删除方案二：delete from t limit 1000; 在for循环中执行100次方案三：在100个连接中同时执行 delete from t limit 1000;前面有说到，要尽量避免长连接，方案一事务较长，占用锁时间长，可能会导致其他客户端连接等待资源时间过长，甚至还有可能导致主从延迟。方案二，串行化执行，把长事务划分成短事务，每次事务占用锁的时间会较短，其他连接等待时间也会相应缩短。将...

mysql数据库相关基础知识01【代码】

数据库的简介1.什么是数据库：数据仓库。访问必须只能用SQL语句来访问。数据库也是一个文件的系统。 2.数据库的作用：存储数据的作用。开发任何的应用，都有数据库。 3.关系型的数据库：数据库中保存的都是实体与实体之间的关系。 4.常见的数据库* Java开发，必用的两个数据库Oracle和MySQL* Oracle数据库（甲骨文）大型的数据库，收费的。* MySQL数据库小型的数据库，免费开源的。被Oracle收购了（在6.x版本下开始收费了）*...

大量删除MySQL中的数据【代码】

出现的背景：公司做了一个redis相关的项目，其中mysql存储了很多统计数据。比如客户端上报的数据，redis实例的数据，应用的数据，机器的数据等。每天都在上报，采集，由于没有定期删除，数据大量累积。大概有一年左右的数据，一个表的数据已经达到亿级别的。这样算下来，一个表的数据至少是几十GB了。因此需要删除过期的数据，暂时保留近三个月的统计数据。解决方案：基本每个表都有个字段叫create_time或者collect_time的字段，只...

关于Mysql 查询所有表的实时记录用于对比2个MySQL 库的数据是否异步【代码】【图】

Xu言：今天，为了研究一个MySQL主从同步开机后报错问题，如下图故障原因分析：经过分析，可能是主从服务器开机顺序导致。（有待下次断电再次测试）主从错误提示：日志读取错误的问题。解决方法：更新日志记录文件，重新主从同步。担心主从问题过程中有数据写入，想去确认下主从库上的数据是否一致。想到了查询下数据库行数的方式。网上查询了下，一般有2种：方法一：查看当前表的记录行数SELECT count(*) from 表名方法二：...

python连接mysql数据库

1.系统必须安装MySQL-python软件，否则python没有连接的模块(在Linux系统)yum install MySQL-python2.安装mysql数据库yum install mysql-server mysql[root@AY140528120357495c4bZ ~]# /etc/init.d/mysqld restartStopping mysqld: [ OK ]Starting mysqld: [ OK ][root@AY140528120357495c4bZ ~]#3.在mysql中创建数据库和表[root@AY1405...

配置MySQL数据库【图】

一、配置MySQL数据库1、解压绿色版mysql，如下图二、安装服务1、运行cmd（管理员版本，否则没有权限），如下图 2、运行命令mysqld –install安装服务，如下图：如果不需要mysql里，只需要运行mysqld –remove即可移除，如下图 3、运行net start mysql 启动服务，如下图如需要配置是否开机启动mysql可以在windows服务里面配置。三、客户端测试1、mysql –uroot –p 如下图四、配置编码为UTF-81、在mysql5.6的根目录下，复制my-d...

Mysql备份数据库的一种方法

今天添加了一个数据库自动备份的模块，mysql数据备份的方法有很多，可以对单个数据库备份，可以多个数据库备份，也可以对某一个表进行备份，可以只备份数据库的结构不备份数据，可以根据需要做不同处理，正好现在有点时间，简单的记录一下最为简单的一种备份方法。Mysql版本：5.11.利用mysqldump对mysql数据库进行备份mysqldump是一个单独的可执行程序，并非mysql运行时的一个命令，使用mysqldump时，如果是在Windows下下，需要先在...

MYSQLshu数据库学习----查询

查询语句是MYSQL数据库中用到的最多的语句。查询语句分为几种单表查询集合函数查询连接查询子查询合并查询正则表达式查询一：单表查询SELECT 属性 FROM 表名 [WHERE 查询条件][GROUP BY 属性名1 [HAVING 分组条件]][ORDER BY 属性2 [ASC/DESC]][LIMIT];WHERE 查询条件查询条件符号或关键字例子比较=、<、<=、>、>=、!=、<>、!>、!<WHERE ID = 1指定范围BETWEEN AND、NOT BETWEEN ANDWHERE ID BETWEEN 2 AND 3指定集合IN、NOT INWH...

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