Oracle is a relational database management system (RDBMS), and it utilizes Structured Query Language (SQL) to enable communication between applications and the database. Performance tuning is the process ofoptimizing Oracle performanceby streamlining the execution of SQL statements. In other words,perfo...
statistics_level 参数是oracle9.2开始引入的一个控制系统统计参数收集的一个开关.一共有三个:basic,typical,all.支持alter session,alter system 动态修改.如果要用statspack或者AWR收集系统性能统计数据.那么这个参数的值必须为typical或all.通常all是一个全面收集,包括 OS以及sql执行路径方面的一些统计信息,除非遇见非常...
最后一种情况是在ITL里面没有system change number,服务进程读回滚段头发现所以事务都提交了,如果当前SCN是存在回滚段头里的事务表里,Oracle把该SCN 拷贝到ITL里,然后再来读该块。但是如果没有找到当前SCN,Oracle将用当前的数据块版本和存储在回滚段里的块来制造一个数据块的读一致版本。存储在回滚段里的before imag...
Self - tuning for SQL performance in Oracle database 11g [ C ] / / IEEE 25th international conference on data engineering. Shanghai, China:IEEE,2009 :1694 - 1700 .P. Belknap, B. Dageville, K. Dias, and K. Yagoub, "Self-tuning for SQL performance in Oracle database 11g," in Proc...
Top Oracle DBA interview questions, Oracle RAC interview questions, Oracle database architecture, backup/recovery of database and performance tuning Questions on Advanced Topics for Experienced Professionals.
Automatic Performance Diagnosis and Tuning in Oracle Karl Dias, Mark Ramacher, Uri Shaft, Venkateshwaran Venkataramani, Graham Wood Oracle Corporation 500 Oracle Parkway Redwood Shores, CA 94065, USA {kdias, mramache, ushaft, veeve, gwood}@oracle.com Abstract Performance tuning in modern data...
http://www.dba-oracle.com/t_steps_for_oracle_performance_tuning.htm Question:I am new to Oracle tuning, and I want to know the steps for Oracle performance tuning. Answer:As of Oracle 11g, Oracle has codified a top-down tuning approach, with the first steps being very broad, and succes...
http://www.dba-oracle.com/t_steps_for_oracle_performance_tuning.htm Question:I am new to Oracle tuning, and I want to know the steps for Oracle performance tuning. Answer:As of Oracle 11g, Oracle has codified a top-down tuning approach, with the first steps being very broad, and succes...
Setting parameters in NQSConfig.INI:The NQSConfig.INI file contains additional configuration and tuning parameters for the Oracle BI Server, including parameters to configure disk space for temporary storage, set virtual table page sizes, and several other advanced configuration settings. SeeAppendix A, ...
This chapter describes the top tuning areas for Oracle Fusion Middleware. It covers critical Oracle Fusion Middleware performance areas and provides a quick start for tuning Java EE applications in the following sections:Section 2.1, "About Identifying Top Performance Areas" Section 2.2, "Ensure the...