成功安装Oracle 11g数据库后,你会发现自己电脑运行速度会变慢,配置较低的电脑甚至出现非常卡的状况,通过禁止非必须开启的Oracle服务可以提升电脑的运行速度。那么,具体该怎么做呢? 按照win7 64位环境下Oracle 11g R2安装详解中的方法成功安装Oracle 11g
成功安装Oracle 11g数据库后,你会发现自己电脑运行速度会变慢,配置较低的电脑甚至出现非常卡的状况,通过禁止非必须开启的Oracle服务可以提升电脑的运行速度。那么,具体该怎么做呢?
按照win7 64位环境下Oracle 11g R2安装详解中的方法成功安装Oracle 11g后,共有7个服务,分别为Oracle ORCL VSS Writer Service,OracleDBConsoleorcl,OracleJobSchedulerORCL,
OracleMTSRecoveryService,OracleOraDb11g_home1ClrAgent,OracleOraDb11g_home1TNSListener,OracleServiceORCL。其中OracleDBConsoleorcl,
OracleMTSRecoveryService,OracleOraDb11g_home1TNSListener,OracleServiceORCL是默认自动启动的,OracleJobSchedulerORCL是默认自动禁止的,其余的默认为手动操作。假设您的全局数据库名为orcl,则您的Oracle服务应该和上面的一样。如下图所示:
这七个服务的含义分别为:
Oracle ORCL VSS Writer Service:Oracle卷映射拷贝写入服务,VSS(Volume Shadow Copy Service)能够让存储基础设备(比如磁盘,阵列等)创建高保真的时间点映像,即映射拷贝(shadow copy)。它可以在多卷或者单个卷上创建映射拷贝,同时不会影响到系统的系统能。(非必须启动)
OracleDBConsoleorcl:Oracle数据库控制台服务,orcl是Oracle的实例标识,默认的实例为orcl。在运行Enterprise Manager(企业管理器OEM)的时候,需要启动这个服务。(非必须启动)
OracleJobSchedulerORCL:Oracle作业调度(定时器)服务,,ORCL是Oracle实例标识。(非必须启动)
OracleMTSRecoveryService:服务端控制。该服务允许数据库充当一个微软事务服务器MTS、COM/COM+对象和分布式环境下的事务的资源管理器。(非必须启动)
OracleOraDb11g_home1ClrAgent:Oracle数据库.NET扩展服务的一部分。 (非必须启动)
OracleOraDb11g_home1TNSListener:监听器服务,服务只有在数据库需要远程访问的时候才需要。(非必须启动,下面会有详细详解)。
OracleServiceORCL:数据库服务(数据库实例),是Oracle核心服务该服务,是数据库启动的基础, 只有该服务启动,Oracle数据库才能正常启动。(必须启动)
那么在开发的时候到底需要启动哪些服务呢?
对新手来说,要是只用Oracle自带的sql*plus的话,只要启动OracleServiceORCL即可,要是使用PL/SQL Developer等第三方工具的话,OracleOraDb11g_home1TNSListener服务也要开启。OracleDBConsoleorcl是进入基于web的EM必须开启的,其余服务很少用。
注:ORCL是数据库实例名,默认的数据库是ORCL,你可以创建其他的,即OracleService+数据库名。

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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