在AIX平台安装Oracle RAC就是个坑爹的事情,今日再次验证了这点,只因为bug太多!记录问题也只因为bug太多!强烈推荐及看好Oracl
在AIX平台安装Oracle RAC就是个坑爹的事情,今日再次验证了这点,只因为bug太多!记录问题也只因为bug太多!强烈推荐及看好Oracle RAC在Linux平台的发展。下面对问题的记录:
>服务器:IBM Power 740
>存储:IBM DS 5020
> 操作系统:
mzrac2@root[/oracle]oslevel -s
6100-07-00-0000
> Oracle Grid&Database:11.2.0.3
一.安装过程出现如下问题:
1.在检查过程中出现如下的告警:
经过检查,在AIX6.1TL7上是不需要这两个补丁的,因此可以直接忽略。
2.安装Grid的时候出现如下的报错:
点击"Retry"之后又可以顺利通过。
之后安装Database软件的时候比较顺利。
3.使用dbca创建数据库的时候问题又来了,创建过程中始终报ORA-03113的错误,如下图:
虽然报错,但是数据库又能继续创建,直到创建成功!坑爹啊,这么创建的数据库谁敢用啊!!!
4.core_* dump目录及文件撑爆你的$ORACLE_HOME/dbs目录。
在这种情况下创建的数据库会在$ORACLE_HOME/dbs目录下生成大量的core_* dump目录及文件,直到文件系统被撑爆!!!

MySQLoffersvariousstorageengines,eachsuitedfordifferentusecases:1)InnoDBisidealforapplicationsneedingACIDcomplianceandhighconcurrency,supportingtransactionsandforeignkeys.2)MyISAMisbestforread-heavyworkloads,lackingtransactionsupport.3)Memoryengineis

Common security vulnerabilities in MySQL include SQL injection, weak passwords, improper permission configuration, and unupdated software. 1. SQL injection can be prevented by using preprocessing statements. 2. Weak passwords can be avoided by forcibly using strong password strategies. 3. Improper permission configuration can be resolved through regular review and adjustment of user permissions. 4. Unupdated software can be patched by regularly checking and updating the MySQL version.

Identifying slow queries in MySQL can be achieved by enabling slow query logs and setting thresholds. 1. Enable slow query logs and set thresholds. 2. View and analyze slow query log files, and use tools such as mysqldumpslow or pt-query-digest for in-depth analysis. 3. Optimizing slow queries can be achieved through index optimization, query rewriting and avoiding the use of SELECT*.

To monitor the health and performance of MySQL servers, you should pay attention to system health, performance metrics and query execution. 1) Monitor system health: Use top, htop or SHOWGLOBALSTATUS commands to view CPU, memory, disk I/O and network activities. 2) Track performance indicators: monitor key indicators such as query number per second, average query time and cache hit rate. 3) Ensure query execution optimization: Enable slow query logs, record and optimize queries whose execution time exceeds the set threshold.

The main difference between MySQL and MariaDB is performance, functionality and license: 1. MySQL is developed by Oracle, and MariaDB is its fork. 2. MariaDB may perform better in high load environments. 3.MariaDB provides more storage engines and functions. 4.MySQL adopts a dual license, and MariaDB is completely open source. The existing infrastructure, performance requirements, functional requirements and license costs should be taken into account when choosing.

MySQL uses a GPL license. 1) The GPL license allows the free use, modification and distribution of MySQL, but the modified distribution must comply with GPL. 2) Commercial licenses can avoid public modifications and are suitable for commercial applications that require confidentiality.

The situations when choosing InnoDB instead of MyISAM include: 1) transaction support, 2) high concurrency environment, 3) high data consistency; conversely, the situation when choosing MyISAM includes: 1) mainly read operations, 2) no transaction support is required. InnoDB is suitable for applications that require high data consistency and transaction processing, such as e-commerce platforms, while MyISAM is suitable for read-intensive and transaction-free applications such as blog systems.

In MySQL, the function of foreign keys is to establish the relationship between tables and ensure the consistency and integrity of the data. Foreign keys maintain the effectiveness of data through reference integrity checks and cascading operations. Pay attention to performance optimization and avoid common errors when using them.


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