2 2 s10 performance upgrades

[. Net Object-Oriented programming advanced] (15) caching (Cache) (2) Using Cache to improve program performance and javacache caching [. Net Object-Oriented programming advanced] (15) Cache (ii) using Cache to improve program performance This section introduces: In the previous section, the cache technology exchanges space for time, and introduces the Client Cac

Select 1-(physical. Value-direct. Value-lobs. Value)/logical. value) "Buffer cache hit ratio" From v $ sysstat physical, V $ sysstat direct, V $ sysstat lobs, V $ sysstat logical Where physical. Name = 'physical reads' And direct. Name = 'physical reads direct' And lobs. Name = 'physical reads direct (LOB )' And logical. Name = 'session logical reads '; When the preceding statement is greater than 90%, the statement is fully adjusted. The hit rate is high! Iii. Improve database buffer cache

Document directory Problem proposal Problem Analysis Solve the problem Problem proposal Problem Analysis Or is the performance seriously degraded due to the big data of a table? Do we have to store multiple tables to solve the problem? In the following example, we will analyze and optimize the Data Management Performance of dedecms. Do not make mysql a scapegoat. The test data is accidentally obta

(2) New Features of Unity5.0 ------ internal unity: memory and performance (and Unity5 upgrade and optimization), unity5In our script code, we often need to access the gameObject reference or reference a component. The best way is to cache all these potentially accessed items during the Awake script.To access an attribute of a temporary gameObject instance or a gameObject instance of a temporary component,M

));This typical trace statement can lead to serious performance problems, even if we turn off the program's tracking function, the amount of computation implied by this statement is absolutely negligible:1 Create a temporary string object for "x="2 Call function Itoa;3 The character pointer returned from ITOA creates a temporary object of string4 Connect the above two strings to construct the third temporar

The ORACLE tutorial is: Oracle SQL Performance Optimization Series 2. 4. Select the most efficient table name sequence (only valid in the rule-based Optimizer) The ORACLE parser processes the table names in the FROM clause in the order FROM right to left. Therefore, the table written in the FROM clause (basic table driving table) will be processed first. when the FROM clause contains multiple tables, You m

In the performance testing, we often refer to a number of indicators and standards, today to share a more popular industry "2-5-10 principle."The specific statement can be attributed to the following 4:1. When the user is able to 2 when the response is received, the response of the system will be felt quickly.2. When t

＞" Response.Write Data（ 1, nRep ） Response.Write "＜/TD＞＜TD＞" Response.Write Data（ 2, nRep ） Response.Write "＜/TD＞＜TD＞" Response.Write Data（ 3, nRep ） Response.Write "＜/TD＞＜TD＞" Response.Write Data（ 4, nRep ） Response.Write "＜/TD＞＜TD＞" Response.Write Data（ 5, nRep ） Response.Write "＜/TD＞＜/TR＞" Next End Function While this code is likely to provide us with the best performance and scalability, the encapsulat

generated view) Ash generation Run the following script, for example, to generate the Ash report: @?/rdbms/admin/ashrpt.sql 1. You are all the way to the carriage. is to get the ash report for the recent 15 minutes. 2. You are based on oldest ash sample available time and then enter, choosing the longest ash execution 3 that can be collected at the moment . You can choose oldest Ash sample available and latest Ash sample Time between available, then

. You are all the way to the return, is to get the latest 15 minutes of ash report. 2. You are based on oldest ash sample available time and then enter, choosing the longest ash execution 3 that can be collected at the moment. You can choose the time between oldest Ash sample available and latest Ash sample available, and then enter the length, for example 30 for 30 minutes, whichever time you want to take the ash reportThe ash report can also be obta

Where mgr = E. EMPNO)And sal> 50000And job = 'manager ';6. Avoid '*' in the SELECT clause '*'When you want to list all columns in the SELECT clause, using dynamic SQL COLUMN reference '*' is a convenient method. unfortunately, this is a very inefficient method. in fact, ORACLE converts '*' into all column names in sequence during parsing. This task is done by querying the data dictionary, which means it takes more time.7. Reduce the number of database accessesWhen each SQL statement is executed

. iamge, convertView. findViewById (R. id. iamge ));}(TextView) convertView. getTag (R. id. text). setText (listData. get (position ));Int id = position % 2 = 1? R. drawable. icon: R. drawable. default_head;(ImageView) convertView. getTag (R. id. iamge). setImageResource (id ); As you can see. The final result is similar to optimization 1. Maybe the results are not very accurate, but at least we know how to use traceView to help us, and also know the

Introduction Asp.net has many "secrets" worth exploring. When you discover them, it will greatly improve the performance and scalability of your website! For example, there are some secret bottlenecks for Membership and Profile providers, and they are easily resolved, making authentication and authorization faster. In addition, the http pipeline of asp.net can process each request to prevent attacks by executing unnecessary code. More than that, the

MyISAM-compromise between performance and features (2) MyISAM features As an old MySQL engine. MyISAM has many good features. These features have been developed for many years. Can meet the work needs. Lock and concurrency MyISAM locks the entire table, not the row. The reader can obtain the read lock of the table to be read. The write lock is obtained by the write program. However, new data can still be i

inversion only needs to scan a very small number of rows. And the second, the Third Association table is based on the index query, the speed is very fast. Sorting optimization Anyway, sorting is a very expensive operation. So from a performance perspective, you should avoid sorting as much as possible or avoid sorting large amounts of data.The previous article talked about how to sort by index. When a sort result cannot be generated usi

android-Optimizing UI Performance (2)-Improving the efficiency of adapteran increase in the efficiency of adapterAdapter is the bridge between the data and the ListView, and whenever you need to display the item, the GetView () will be called.If we have a large amount of data and adapter is inefficient (each time we call inflate to create a new view,inflate (an IO operation), the interface will beFor exampl

MySQL Performance-Schema (2) theory, performanceschema MySQL Performance-Schema contains a total of 52 tables, which are mainly divided into the Setup table, Instance table, Wait Event table, Stage Event TABLE Statement Event table, Connection table, and Summary table. The previous article focuses on the Setup table. This article will describe each type of table

have to make the database redundant to improve the search efficiency. The following describes in detail. 2. reasonable redundancy Everything has two sides, and the three paradigms are no exception. It is good to achieve a balance. As mentioned in the previous article, the bottleneck of system performance is relative. The principle is as follows: Who affects the perform