查看已有VG #lsvg rootvg oravg datavg 查看每个VG使用状态 #lsvg oravg 重点关注几个值 PP SIZE: 512 megabyte(s)
查看已有VG
#lsvg
rootvg
oravg
datavg
查看每个VG使用状态
#lsvg oravg
重点关注几个值
PP SIZE: 512 megabyte(s) 注释:每个PP大小
FREE PPs: 147 (75264 megabytes) 注释:剩余pp数及空间大小
#lsvg datavg
PP SIZE: 512 megabyte(s)
FREE PPs: 3974 (2034688 megabytes)
查看当前lv建立的数目
#lsvg -l rootvg 注释:rootvg上面没有关于数据库的lv
#lsvg -l oravg
........... ... ... ... . .......... ...
lv_users_49 raw 128 128 1 open/syncd N/A
lv_users_50 raw 128 128 1 open/syncd N/A
lv_users_51 raw 128 128 1 open/syncd N/A
lv_users_52 raw 128 128 2 open/syncd N/A
#lsvg -l datavg
datavg:
LV NAME TYPE LPs PPs PVs LV STATE MOUNT POINT
lv_users_53 raw 128 128 1 open/syncd N/A
lv_users_54 raw 128 128 1 open/syncd N/A
lv_users_55 raw 128 128 1 open/syncd N/A
lv_users_56 raw 128 128 1 open/syncd N/A
lv_users_57 raw 128 128 1 open/syncd N/A
lv_users_58 raw 128 128 1 open/syncd N/A
lv_users_59 raw 128 128 1 open/syncd N/A
lv_users_60 raw 128 128 1 open/syncd N/A
查看完成后,新的lv从lv_users_61开始建
例如:
在oravg下建十块lv,每块大小64g,名字为
lv_users_61 lv_users_62 lv_users_63 ... ... lv_users_64
PP_Size=512M,64G/PP_Size=128(NumPPs)
命令格式:
"/usr/sbin/mklv -y LVname -T O -w n -s n -r n VGname NumPPs"
#mklv -y lv_users_61 -t 'raw' -T O -w n -s n -r n datavg 128
#mklv -y lv_users_62 -t 'raw' -T O -w n -s n -r n datavg 128
#mklv -y lv_users_63 -t 'raw' -T O -w n -s n -r n datavg 128
... ...
#mklv -y lv_users_70 -t 'raw' -T O -w n -s n -r n datavg 128
修改rlv块设备权限
#cd /dev/
#ls -l rlv_user_60 查看以前块设备权限
#ls -l rlv_user_61 查看刚才新建的块设备权限
#chown Oracle:dba rlv_user_61
#chown oracle:dba rlv_user_62
#chown oracle:dba rlv_user_63
... ...
#chown oracle:dba rlv_user_70
然后加到表空间 Usersoracle加空间命令
#su - oracle
$sqlplus /nolog
$conn sys/oracle as sysdba;
进入sqlplus
>ALTER TABLESPACE "USERS" ADD DATAFILE '/dev/rlv_users_61' SIZE 65500M REUSE;
>ALTER TABLESPACE "USERS" ADD DATAFILE '/dev/rlv_users_62' SIZE 65500M REUSE;
>ALTER TABLESPACE "USERS" ADD DATAFILE '/dev/rlv_users_63' SIZE 65500M REUSE;
... ...
>ALTER TABLESPACE "USERS" ADD DATAFILE '/dev/rlv_users_70' SIZE 65500M REUSE;
逐个添加,输入加空间命令之后耐心等待,直至出现添加成功的提示之后方可输入下一条
添加命令。
添加完成后检查表空间,,确认添加已经成功!

The main role of MySQL in web applications is to store and manage data. 1.MySQL efficiently processes user information, product catalogs, transaction records and other data. 2. Through SQL query, developers can extract information from the database to generate dynamic content. 3.MySQL works based on the client-server model to ensure acceptable query speed.

The steps to build a MySQL database include: 1. Create a database and table, 2. Insert data, and 3. Conduct queries. First, use the CREATEDATABASE and CREATETABLE statements to create the database and table, then use the INSERTINTO statement to insert the data, and finally use the SELECT statement to query the data.

MySQL is suitable for beginners because it is easy to use and powerful. 1.MySQL is a relational database, and uses SQL for CRUD operations. 2. It is simple to install and requires the root user password to be configured. 3. Use INSERT, UPDATE, DELETE, and SELECT to perform data operations. 4. ORDERBY, WHERE and JOIN can be used for complex queries. 5. Debugging requires checking the syntax and use EXPLAIN to analyze the query. 6. Optimization suggestions include using indexes, choosing the right data type and good programming habits.

MySQL is suitable for beginners because: 1) easy to install and configure, 2) rich learning resources, 3) intuitive SQL syntax, 4) powerful tool support. Nevertheless, beginners need to overcome challenges such as database design, query optimization, security management, and data backup.

Yes,SQLisaprogramminglanguagespecializedfordatamanagement.1)It'sdeclarative,focusingonwhattoachieveratherthanhow.2)SQLisessentialforquerying,inserting,updating,anddeletingdatainrelationaldatabases.3)Whileuser-friendly,itrequiresoptimizationtoavoidper

ACID attributes include atomicity, consistency, isolation and durability, and are the cornerstone of database design. 1. Atomicity ensures that the transaction is either completely successful or completely failed. 2. Consistency ensures that the database remains consistent before and after a transaction. 3. Isolation ensures that transactions do not interfere with each other. 4. Persistence ensures that data is permanently saved after transaction submission.

MySQL is not only a database management system (DBMS) but also closely related to programming languages. 1) As a DBMS, MySQL is used to store, organize and retrieve data, and optimizing indexes can improve query performance. 2) Combining SQL with programming languages, embedded in Python, using ORM tools such as SQLAlchemy can simplify operations. 3) Performance optimization includes indexing, querying, caching, library and table division and transaction management.

MySQL uses SQL commands to manage data. 1. Basic commands include SELECT, INSERT, UPDATE and DELETE. 2. Advanced usage involves JOIN, subquery and aggregate functions. 3. Common errors include syntax, logic and performance issues. 4. Optimization tips include using indexes, avoiding SELECT* and using LIMIT.


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