Statspack是一款功能强大的,免费的,oracle自带的性能分析工具。需要用具有sysdba权限的用户登陆进行安装。通过Statspack我们可
Statspack是一款功能强大的,免费的,Oracle自带的性能分析工具。需要用具有sysdba权限的用户登陆进行安装。
通过Statspack我们可以很容易的确定Oracle数据库的瓶颈所在,记录数据库性能状态,也可以使远程技术支持人员迅速了解你的数据库运行状况。
如果想要开启自动收集数据库的参数信息需要修改两个参数:
实验环境:
OS:RedHat 5.5
DB:oracle11g
参数设置:
job_queue_processes和timed_statistics
查询job_queue_processes是否大于0:
show parameter job_queue_processes;
如果=0,我们需要修改
alter system set job_queue_processes=10;
查看timed_statistics是否为true
修改:
alter system set timed_statistics=true;
安装statpack:
需要拥有sysdba权限的用户操作,首先创建用户表空间,这需要看我们收集的信息量的大小来设置,一般设置成500M既可
create tablespace perfstat '/home/oracle/perfstat.dbf' size 500m extent management local;
@$ORACLE_HOME/rdbms/admin/spcreate.sql
为用户perfstat设置密码
输入表空间和临时表空间
SPCPKG complete. Please check spcpkg.lis for any errors.
--需要出现上述语句才算成功,否则请查看.lis文件并执行,,进行重建
如果在创建的时候出错,我们可以删除重新建立:
@$ORACLE_HOME/rdbms/admin/spdrop.sql
在重新建立即可。
生成调查报告,切换到perfstat用户:
收集系统信息:execute statspack.snap;
查看收集统计信息的情况:
SQL> select snap_id,snap_time,startup_time from stats$snapshot;
SNAP_ID SNAP_TIME STARTUP_T
---------- --------- ---------
1 14-AUG-11 14-AUG-11
2 14-AUG-11 14-AUG-11
5 14-AUG-11 14-AUG-11
3 14-AUG-11 14-AUG-11
4 14-AUG-11 14-AUG-11
我们也可以使他自动统计系统的情况:
@$ORACLE_HOME/rdbms/admin/spauto.sql

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MySQL is worth learning because it is a powerful open source database management system suitable for data storage, management and analysis. 1) MySQL is a relational database that uses SQL to operate data and is suitable for structured data management. 2) The SQL language is the key to interacting with MySQL and supports CRUD operations. 3) The working principle of MySQL includes client/server architecture, storage engine and query optimizer. 4) Basic usage includes creating databases and tables, and advanced usage involves joining tables using JOIN. 5) Common errors include syntax errors and permission issues, and debugging skills include checking syntax and using EXPLAIN commands. 6) Performance optimization involves the use of indexes, optimization of SQL statements and regular maintenance of databases.

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.

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