在Linux下虽然通过dbca也可以创建数据库,但是在某些环境下却是不能使用图形环境,如数据库服务器在机房,并且开放的端口有限制,
在Linux下虽然通过dbca也可以创建数据库,但是在某些环境下却是不能使用图形环境,如数据库服务器在机房,并且开放的端口有限制,或者需要批量创建数据库。那么,这个时候为了方便就不得不使用手工创建数据库了。以下是创建数据库的步骤:
操作系统:CentOS 5 (安装的时候,修改/etc/RedHat-real* 输入redhat enterprise 4)
数据库:Oracle 10g
环境:
已经使用dbca创建了数据库orcl。
oracle用户所属组为:oracle,dba
ORACLE_BASE=/home/oracle/oracle/
ORACLE_HOME=$ORACLE_BASE/db1
ORACLE_SID=test
ORACLE_OWNER=oracle
NLS_LANG="Simplified Chinese_china"
DB_HOME=/home/oracle/oradata
步骤:
1、创建pfile文件
使用sqlplus sys/orcl@orcl as sysdba 登陆orcl数据库环境,使用命令
create pfile from spfile; 创建pfile文件
再到系统下到$ORACLE_HOME/dbs/目录中使用命令
cp initorcl.ora inittest.ora
或者直接在系统下到$ORACLE_HOME/dbs/目录中使用命令
strings spfileorcl.ora >inittest.ora
完成后,修改inittest.ora文件,将orcl替换为test
2、创建密码文件
cd $ORACLE_HOME/dbs/
orapwd file=orapwtest password=test
3、创建目录
mkdir -p $ORACLE_BASE/admin/test
cd $ORACLE_BASE/admin/test
mkdir adump bdump cdump dpdump pfile
mkdir -p $DB_HOME/test
4、修改监听程序
vi $ORACLE_HOME/network/admin/tnsnames.ora
将其中ORCL部分复制粘贴,并且修改其名称为test
5、开始创建数据库
export ORACLE_SID=test
sqlplus /nolog
conn / as sysdba
spool $ORACLE_BASE/admin/$ORACLE_SID/create/createdb
startup nomount
create database test
LOGFILE
GROUP 1 ('$DB_HOME/test/redo01.log',
'$ORACLE_BASE/oradata/test/redo01_1.log') size 100m reuse,
GROUP 2 ('$DB_HOME/test/redo02.log',
'$DB_HOME/test/redo02_1.log') size 100m reuse,
GROUP 3 ('$DB_HOME/oradata/test/redo03.log',
'$DB_HOME/test/redo03_1.log') size 100m reuse
MAXLOGFILES 50
MAXLOGMEMBERS 5
MAXLOGHISTORY 200
MAXDATAFILES 500
MAXINSTANCES 5
ARCHIVELOG
CHARACTER SET UTF8
NATIONAL CHARACTER SET UTF8
DATAFILE '$DB_HOME/test/system01.dbf' SIZE 1000M EXTENT MANAGEMENT LOCAL
SYSAUX DATAFILE '$DB_HOME/test/sysaux01.dbf' SIZE 1000M
UNDO TABLESPACE UNDOTBS1 DATAFILE '$DB_HOME/test/undo.dbf' SIZE 500M
DEFAULT TEMPORARY TABLESPACE TEMP TEMPFILE
'$DB_HOME/test/temp.dbf' SIZE 500M
;
等待一定时间,如果没有问题会显示数据库创建成功注意UNDO TABLESPACE UNDOTBS1中的名字,,需要和inittest.ora中的名字一样。
@$ORACLE_HOME/rdbms/admin/catalog.sql;
@$ORACLE_HOME/rdbms/admin/catproc.sql;
@$ORACLE_HOME/rdbms/admin/catdbsyn.sql;
alter user system identified by test;
grant sysdba to system;
shutdown immediate;
startup;
spool off
exit
使用system用户登陆
sqlplus system/test
@$ORACLE_HOME/sqlplus/admin/pupbld.sql
exit
数据库创建完成。
如果遇到问题,可以查看日志
$ORACLE_BASE/admin/$ORACLE_SID/create/createdb

MySQL is suitable for beginners to learn database skills. 1. Install MySQL server and client tools. 2. Understand basic SQL queries, such as SELECT. 3. Master data operations: create tables, insert, update, and delete data. 4. Learn advanced skills: subquery and window functions. 5. Debugging and optimization: Check syntax, use indexes, avoid SELECT*, and use LIMIT.

MySQL efficiently manages structured data through table structure and SQL query, and implements inter-table relationships through foreign keys. 1. Define the data format and type when creating a table. 2. Use foreign keys to establish relationships between tables. 3. Improve performance through indexing and query optimization. 4. Regularly backup and monitor databases to ensure data security and performance optimization.

MySQL is an open source relational database management system that is widely used in Web development. Its key features include: 1. Supports multiple storage engines, such as InnoDB and MyISAM, suitable for different scenarios; 2. Provides master-slave replication functions to facilitate load balancing and data backup; 3. Improve query efficiency through query optimization and index use.

SQL is used to interact with MySQL database to realize data addition, deletion, modification, inspection and database design. 1) SQL performs data operations through SELECT, INSERT, UPDATE, DELETE statements; 2) Use CREATE, ALTER, DROP statements for database design and management; 3) Complex queries and data analysis are implemented through SQL to improve business decision-making efficiency.

The basic operations of MySQL include creating databases, tables, and using SQL to perform CRUD operations on data. 1. Create a database: CREATEDATABASEmy_first_db; 2. Create a table: CREATETABLEbooks(idINTAUTO_INCREMENTPRIMARYKEY, titleVARCHAR(100)NOTNULL, authorVARCHAR(100)NOTNULL, published_yearINT); 3. Insert data: INSERTINTObooks(title, author, published_year)VA

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.


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