欢迎进入Oracle社区论坛,与200万技术人员互动交流 >>进入 改变数据库实例名称 env : Windows + oracle8i ---------------------------------- 1.Be sure database closed.if not ,please shutdown first. 2.利用oradim 可以创建服务, ORADIM -NEW -SID new
欢迎进入Oracle社区论坛,与200万技术人员互动交流 >>进入
改变数据库实例名称
env : Windows + oracle8i
----------------------------------
1.Be sure database closed.if not ,please shutdown first.
2.利用oradim 可以创建服务,
> ORADIM -NEW -SID newname -INTPWD pwdnewname.pwd -STARTMODE AUTO -PFILE yourpfile,then you can see the new servcie .
3. Be sure the ORACLE_SID is set in the registry correctly. Goto
Start button-->RUN-->type regedt32-->
Goto the following directory tree within the registry -
HKEY_LOCAL_MACHINE -> SOFTWARE -> ORACLE -
highlight ORACLE - look on the left side look for ORACLE_SID =
To change you can highlight ORACLE_SID - right click on your mouse and
select modify.
Enter the SID.
The above is only valid when using DEFAULT_HOME, when you have another
home then you need to highlight that HOME under ORACLE key
usually HOME1-HOMEx . No spaces can be entered after the = when setting ORACLE_SID
at the DOS Prompt, set oracle_sid=xyz should be used and not
set oracle_sid = xyz
4.Be sure the new instance is started Goto
Start-->Settings-->Control Panel-->Services
and check if the database service is started.
5..in Command line prompt, SET ORACLE_SID=NEWNAME
6.Startup the database ,then you can view v$instance,you will see your new instance name here.

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.

MySQL is an efficient relational database management system suitable for storing and managing data. Its advantages include high-performance queries, flexible transaction processing and rich data types. In practical applications, MySQL is often used in e-commerce platforms, social networks and content management systems, but attention should be paid to performance optimization, data security and scalability.

The relationship between SQL and MySQL is the relationship between standard languages and specific implementations. 1.SQL is a standard language used to manage and operate relational databases, allowing data addition, deletion, modification and query. 2.MySQL is a specific database management system that uses SQL as its operating language and provides efficient data storage and management.

InnoDB uses redologs and undologs to ensure data consistency and reliability. 1.redologs record data page modification to ensure crash recovery and transaction persistence. 2.undologs records the original data value and supports transaction rollback and MVCC.

Key metrics for EXPLAIN commands include type, key, rows, and Extra. 1) The type reflects the access type of the query. The higher the value, the higher the efficiency, such as const is better than ALL. 2) The key displays the index used, and NULL indicates no index. 3) rows estimates the number of scanned rows, affecting query performance. 4) Extra provides additional information, such as Usingfilesort prompts that it needs to be optimized.

Usingtemporary indicates that the need to create temporary tables in MySQL queries, which are commonly found in ORDERBY using DISTINCT, GROUPBY, or non-indexed columns. You can avoid the occurrence of indexes and rewrite queries and improve query performance. Specifically, when Usingtemporary appears in EXPLAIN output, it means that MySQL needs to create temporary tables to handle queries. This usually occurs when: 1) deduplication or grouping when using DISTINCT or GROUPBY; 2) sort when ORDERBY contains non-index columns; 3) use complex subquery or join operations. Optimization methods include: 1) ORDERBY and GROUPB


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