周末在窝里整RAC,尤其是在笔记本上整 使用VBOX软件 因为VBOX 不够稳定 导致死机,无法进图形界面等问题,从而把节点1个干了. 然后从节点2复制过来,可惜VBOX拒绝加载,FUCK VBOX ! ORACLE公司除了ORACLE数据库好外,其他都比较烂,只会收购好公司! 说实在的ORACLE
周末在窝里整RAC,尤其是在笔记本上整 使用VBOX软件 因为VBOX 不够稳定 导致死机,无法进图形界面等问题,从而把节点1个干了.
然后从节点2复制过来,可惜VBOX拒绝加载,FUCK VBOX ! ORACLE公司除了ORACLE数据库好外,其他都比较烂,只会收购好公司!
说实在的ORACLE 数据库也不咋地,使用起来很不方便,尤其是安装的时候. 步骤很多,没个步骤没做好 就要重新来过.
11G的RAC 虽然简化了些,可惜非常地慢, 在CRS图形界面配置后 执行ROOT.SH脚本 才真正地配置CRS 启动CRS各个进程,并且ASM盘格式化.
如果ASM已经被装过或者污染过,则要用DD命令刷屏 FUCK ORACLE 要刷个20G的硬盘会等死人的. 我在笔记本上DD 三个5G硬盘 花费了N个小时.
因为在做ASM盘格式化的时候,不知道是笔记本硬盘不给力还是CPU P61000不给力? 妈地逼耗费了1个小时,然后报错.查看日志说ASM 不支持该版本的操作系统
吊你妹啊 我可是用ORACLE LINUX 6.4 ! 网上有人说 更改/tmp/下的 linux relase 信息. 妈地逼 cat 该文件一看 说是redhat linux 6.4....xxxxx.xxx
不吊你妹 吊谁的妹啊 从ORACLE 官方网站下来的 ORACLE公司人居然不改此信息.
ORACLE 11G 统统使用JAVA系统 非常地慢,需要4G内存 快速硬盘 超强CPU . 比起10G R2版本来说 简直是牛车啊! 当然在窝里的台式电脑10分钟做完ASM工作
连版本不匹配都不说 刷刷就装好了. 看来玩新数据库 得要配置超好的机器.
妈地逼 就1个版本差距 就要消耗如此强的电脑资源,ORACLE公司的软件工程师真烂!
以后要装ORACLE 12C 和EM12C 看来要买个服务器来玩了
[root@node1 dev]# oerr ora 15063
15063, 00000, "ASM discovered an insufficient number of disks for diskgroup \"%s\""
// *Cause: ASM was unable to find a sufficient number of disks belonging to the
// diskgroup to continue the operation.
// *Action: Check that the disks in the diskgroup are present and functioning,
// that the owner of the ORACLE binary has read/write permission to
// the disks, and that the ASM_DISKSTRING initialization parameter
// has been set correctly. Verify that ASM discovers the appropriate
// disks by querying V$ASM_DISK from the ASM instance.
15063 问题是 权限问题 在安装ASM盘的时候 /dev/oracleasm/disks/VOL1-----VOL3 都是root权限
只要chown -R oracle:dba /dev/oracleasm 即可
可是在DBCA下 先要停掉在安装节点上的ASM实例
ps -ef |grep asm
如果你看到一大堆类似乱码的显示 那就是JAVA代码 是DBCA图形界面还开着. 最后几行是ASM进程
export ORACLE_SID=+ASM1
sqlplus /nolog
connect sys/(DBCA图形界面上输入的密码) as dba
shutdown
等待
记住要退出DBCA界面 要不一直等待中.

MySQL's position in databases and programming is very important. It is an open source relational database management system that is widely used in various application scenarios. 1) MySQL provides efficient data storage, organization and retrieval functions, supporting Web, mobile and enterprise-level systems. 2) It uses a client-server architecture, supports multiple storage engines and index optimization. 3) Basic usages include creating tables and inserting data, and advanced usages involve multi-table JOINs and complex queries. 4) Frequently asked questions such as SQL syntax errors and performance issues can be debugged through the EXPLAIN command and slow query log. 5) Performance optimization methods include rational use of indexes, optimized query and use of caches. Best practices include using transactions and PreparedStatemen

MySQL is suitable for small and large enterprises. 1) Small businesses can use MySQL for basic data management, such as storing customer information. 2) Large enterprises can use MySQL to process massive data and complex business logic to optimize query performance and transaction processing.

InnoDB effectively prevents phantom reading through Next-KeyLocking mechanism. 1) Next-KeyLocking combines row lock and gap lock to lock records and their gaps to prevent new records from being inserted. 2) In practical applications, by optimizing query and adjusting isolation levels, lock competition can be reduced and concurrency performance can be improved.

MySQL is not a programming language, but its query language SQL has the characteristics of a programming language: 1. SQL supports conditional judgment, loops and variable operations; 2. Through stored procedures, triggers and functions, users can perform complex logical operations in the database.

MySQL is an open source relational database management system, mainly used to store and retrieve data quickly and reliably. Its working principle includes client requests, query resolution, execution of queries and return results. Examples of usage include creating tables, inserting and querying data, and advanced features such as JOIN operations. Common errors involve SQL syntax, data types, and permissions, and optimization suggestions include the use of indexes, optimized queries, and partitioning of tables.

MySQL is an open source relational database management system suitable for data storage, management, query and security. 1. It supports a variety of operating systems and is widely used in Web applications and other fields. 2. Through the client-server architecture and different storage engines, MySQL processes data efficiently. 3. Basic usage includes creating databases and tables, inserting, querying and updating data. 4. Advanced usage involves complex queries and stored procedures. 5. Common errors can be debugged through the EXPLAIN statement. 6. Performance optimization includes the rational use of indexes and optimized query statements.

MySQL is chosen for its performance, reliability, ease of use, and community support. 1.MySQL provides efficient data storage and retrieval functions, supporting multiple data types and advanced query operations. 2. Adopt client-server architecture and multiple storage engines to support transaction and query optimization. 3. Easy to use, supports a variety of operating systems and programming languages. 4. Have strong community support and provide rich resources and solutions.

InnoDB's lock mechanisms include shared locks, exclusive locks, intention locks, record locks, gap locks and next key locks. 1. Shared lock allows transactions to read data without preventing other transactions from reading. 2. Exclusive lock prevents other transactions from reading and modifying data. 3. Intention lock optimizes lock efficiency. 4. Record lock lock index record. 5. Gap lock locks index recording gap. 6. The next key lock is a combination of record lock and gap lock to ensure data consistency.


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