, Microseconds_per_second ms_per_sec, pct_of_time pct from Opsg_delta_report where Microseconds_per_second > 0; Monitoring the usage of indexes: With In_plan_objects as(SELECT DISTINCT object_name from V$sql_plan WHERE object_owner = ' SCOTT ')SELECT table_name,Index_name,CaseWhen object_name was NULL then' NO 'ELSE' YES 'END as In_cached_planFrom User_indexesLeft OUTER JOIN in_plan_objectsOn (index_name = object_name);4. Identify the SQL statements that benefit from the binding variab
Tags: implementation mechanism originally page organizes tables based on free article content index ClustFollowing the book on SQL tuning (SQL tuning or SQL optimization) in the essentials of high-performance SQL tuning and case resolution, we talk today about one of the most important core mechanisms of SQL
valuable, while the Oracle lock mechanism is more advantageous, allowing Oracle applications to be more comfortable with DML operations, but this does not mean that you can do whatever you do, and in reality, even a lot of senior developers, are not very understanding of the characteristics and application of Oracle transactions, so often unnecessary use of manu
at any time to modify the value of an optimization parameter to observe the result comparison before and after the adjustment. Use the new Opt_param hint to get
The same effect.
Select/*+ opt_param (' Optimizer_mode ', ' first_rows_10 ') * * col1, col2 ...
Select/*+ opt_param (' Optimizer_index_cost_adj ',) * * col1, col2. .
Oracle has released a large number of SQL prompts, and hints are constantly being enhanced and complicated by the d
Linux server performance tuning skills, linux Server TuningPerformance tuning skills for 20 Linux servers
Guide
Linux is an open-source operating system that supports various hardware platforms. Linux servers are world-renowned. The main difference between Linux and Windows is that, by default, a Linux server does not provide a GUI (graphical user int
JavaScript is a relatively complete front-end development language, in today's web development applications are very wide, especially for Web 2.0 applications. As Web 2.0 becomes more and more popular today, we will find that there will be a lot of JavaScript code in our Web application projects, and that there will be more and more in the future. JavaScript, as a language to interpret execution, and its single-threaded mechanism, determines that performance
Over the past decade, Oracle has become one of the most professional databases in the world. For IT professionals, it is important to ensure that Oracle's powerful features are used to improve the productivity of their companies. One of the most effective ways to do this is through Oracle tuning. It has a large number of tuni
range. That doesn't make sense either.
For performance testing, we also need to define a time period. For example, it lasts 15 minutes on a certain throughput. Because the system becomes unstable when the load arrives, the system will stabilize after a two-minute time. In addition, it is possible that your system behaves normally in the first few minutes of the load, and then it is unstable and even collapsed. So it takes so long. This value, we
To improve system performance, developers can optimize the system from every angle and level of the system. In addition to the most common code optimizations, the software architecture, the JVM virtual machine layer, the database, and the operating system layer can be tuned in a variety of ways to improve overall system performance.Design TuningDesign tuning is at the top of all
StepsGeneral performance issues tuning steps: Step One : Identify the problemApplication code: In general, the performance problems of many programs are written, so for the module that finds the bottleneck, you should first check the code. database configuration: Often causes the entire system to run slowly, some large databases, such as
, while explaining skills without forgetting to get started from basics. Strive for the reader does not need a strong foundation, but also can understand, understand, learn and can soon practice, applied to the actual project performance test.
"Performance Testing and Tuning" course schedule
Serial Number
Training Content
class Hours
A graduation on the contact optimization problems, professional optimization also has at least 5 years of time, but now still often hear many people think that optimization is very simple, is to build index problem, it really can not blame everyone, do this line for more than 20 years, at every stage of career, almost can hear such a voice, In many books have also seen such a statement, but here I want to tell you: optimization is not just index, optimization is not very simple thing, this job r
. GC Tuning target has three basic ideas: Reduce GC frequency, can increase the heap space, reduce unnecessary object generation, reduce GC pause time, can be achieved by reducing heap space, using the CMS GC algorithm, avoid full GC, adjust the CMS trigger scale, avoid Promotion Failur E and Concurrent mode failure (the older generation allocates more space, increases the number of GC threads to recover faster), reduces large object generation, and s
tuning rules that every Oracle DBA should follow
Over the past decade, Oracle has become one of the most professional databases in the world. For IT professionals, it is important to ensure that Oracle's powerful features are used to improve the productivity of their companies. One of the most effective ways to do this is through
Over the past decade, Oracle has become one of the most professional databases in the world. For IT professionals, it is important to ensure that Oracle's powerful features are used to improve the productivity of their companies. One of the most effective ways to do this is through Oracle tuning. It has a large number of tuni
Over the past decade, Oracle has become one of the most professional databases in the world. For IT professionals, it is important to ensure that Oracle's powerful features are used to improve the productivity of their companies. One of the most effective ways to do this is through Oracle tuning. It has a large number of tuni
strong support for the application performance diagnosis.Back to top of pagePerformance optimization PracticesAfter introducing some of the commonly used performance diagnostic tools, here are some examples from the JVM layer, the application code layer, and the database tier, combined with our practice in Java application tuning.JVM Tuning: GC PainSogou Commerc
Sun's technology day in Sydney, Gosling said many tools now use JDBC to connect to the database, using APIs to enable SQL statements to execute, which
9.15 Useful MYSQL/MARIADB performance tuning and optimization tips
Introduction: This article will show you some basic, but very useful tips on how to optimize MYSQL/M
. For example, when an index is deleted, the execution Plan of the corresponding SQL Plan baseline is deleted, this will not help avoid performance degradation. I personally think this is a comprehensive choice of Oracle, and it is not a limitation of SQL Plan Management.
The SQL Tuning function of the Oracle database
MySQL is a powerful open-source database. With more and more database-driven applications, people have been pushing MySQL to its limits. Here are 101 tips for adjusting and optimizing MySQL installation. Some of the techniques are specific to the installation environment, but these ideas are generic. I've divided them into several categories to help you master more of the tuning and optimization techniques
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