2 2 s10 performance upgrades

Oracle Performance AnalysisSoftware Environment: Oracle 11g, dual-machine RAC.Problem:Large table (Tens) query, slow operation, often timeout terminal (ORA-01013: User request to cancel the current operation)Analysis:1) partition Table2) Historical Data archiveSolve:Adoption of Scenario 2). Create history tables, Create Table as Select * from where ...Deletes the table data. The amount of data is to

SQL Server query performance optimization-index and SARG (I) For non-SARG statements, SQL SERVER must evaluate each record to determine whether it meets the WHERE clause conditions. Therefore, indexes are usually useless for queries using non-SARG conditions. A non-SARG statement usually contains the following operations: NOT ,! =, Create SQL Server query performance optimization-index and SARG (1) Create

Centos performance monitoring series 2: initial solution of CollectlFor a Linux system administrator, it is the primary responsibility to ensure that the system managed by the Administrator is in a good state.Linux administrators can find many tools to help them monitor and display processes in the system, such as top and htop.Today, we will introduce collectl, a tool that is easy to use;Introduction:Collec

PLSQL _ Statistical Information Series 2 _ errors in program performance (CASE) and plsql statistics Created By BaoXinjian I. Summary In a stable database with performance, all jobs must be completed within a certain period of time. In the past, in a banking system, a job was originally completed in 30minutes, but after 3hours, it was still running Excluding the

other elements are downloaded during page rendering.If you find that your page is always in the loading status, it is probably caused by the $ (document). Ready function. You can bind the jquery function to the $ (window). Load event to reduce the CPU usage during page loading.It will be executed after all HTML (including $ (Window). Load (function () {// jquery function initialized after the page is fully loaded .}); Some special effects, such as drag-and-drop, visual effects

other elements are downloaded during page rendering.If you find that your page is always in the loading status, it is probably caused by the $ (document). Ready function. You can bind the jquery function to the $ (window). Load event to reduce the CPU usage during page loading.It will be executed after all HTML (including $ (Window). Load (function () {// jquery function initialized after the page is fully loaded .}); Some special effects, such as drag-and-drop, visual effects an

Use Snapshot isolation to improve system performance. Start Snapshot isolation. this function is available in sql2005. you can use the following connection to find out what is Snapshot isolation and how to do it. starting Snapshot isolation can improve your performance and solve some resource locking problems to varying degrees. Refer: Http://msdn.microsoft.com/zh-cn/library/tcbchxcb (vs.80). aspx Http://ms

Solution 2: optimize the code To do well, you must first sharpen your tools. To optimize the code, you must first find the bottleneck of the Code. The most common method is to add log or print, and delete the code after debugging is complete, which is troublesome. Python also provides many profile tools: profile, cProfile, hotshot, and pystats. However, these tools provide poor readability, the function or row takes the most time at a glance. Python l

limitations: 1 The insertion speed is heavily dependent on the insertion order, in the order of the primary key is the fastest way to insert, otherwise there will be page splitting, seriously affecting performance. Therefore, for InnoDB tables, we generally define a self increasing ID column primary key. 2 The cost of updating a primary key is high because it will cause the row to be updated to move. The

acquired data locally; Do not request the same data multiple times;The first technology is easiest to set up and maintain, and the second gives you the greatest degree of control;Set HTTP headers;If you want AJAX messages to be cached by the browser, you must initiate a GET request, and you must send the correct HTTP in the appropriate message, and the expires header tells the browser how long the response message should be cached;----------------------------------------------------------------

Copyright Notice: This article can be reproduced, but it shall not be used for any commercial purposes or other purposes for profit without my permission. I reserve all rights to this article. If you need to reprint the content, Please retain this copyright statement and ensure the integrity of this article. You can also understand the hard work and respect the work of the author. Author: Chen Lei(Jackei) Email:Jackeichan@gmail.com Blog:Http://jackei.cnblogs.com The idea of statistical a

The 2-5-8 principle refers to the response time of the system That is, when the user in 2 seconds to get a response, it will feel the system response quickly; When the user in 2-5 seconds to get a response, you will feel the system response speed is also possible; When the user gets a response within 5-8 seconds, the system responds slowly, but it can be

cache common attribute. You can cache the id of the result set of the object and query the cache lifecycle. When the associated table is modified, the query cache lifecycle ends, the query cache has nothing to do with the session lifecycle and can be performed across sessions. Query cache only applies to query. list (). query. iterate () does not use query cache to query common attributes.Query cache configuration and usage:1. Modify the hibernate. cfg. xml file to enable the query cache. The d

1. Learning ObjectivesLearn more about the working mechanism and usage of level 2 cache in nhive.2. Development Environment and necessary preparationDevelopment Environment: Windows 2003, Visual Studio. NET 2005, SQL Server 2005 Developer EditionPrerequisites: the first five nhibana Learning Series: Start of nhibana learning-1. Start of nhibana learning-to-one, and start of nhibana learning-to-quit, 3-Level

allocated only when the table is opened by the next thread. tableNum 44. memory usage 1. determine the upper limit of memory available 2. Determine the memory used for each connection to mysql 3. Determine the memory used by the operating system 4. submit all the remaining memory to the mysql Cache The glibc library of the system may also limit the size of memory allocated each time. innodb_buffer_pool 45. CacheThe operating system cache of In

://example.comIf you need to run locust distributed under multiple processes, we can start a main process with "-master":Locust-f. /locust_files/my_locust_file.py--master--host=http://example.comYou can then start any number of slave processes:Locust-f. /locust_files/my_locust_file.py--slave--host=http://example.comIf we want to run locust on multiple machines, we can also define the primary server to which it belongs while starting from the server (if you are running locust on only one machine,

-blocking refers to whether the process needs to wait if the data accessed by the process is not yet ready.Synchronous and asynchronous refers to the mechanism to access data, synchronous refers to the request and wait for the completion of the I/O operation, when the data is ready to be blocked while reading and writing, asynchronous refers to the request data can continue to process other tasks, and then wait for the I/O operation is completed, which makes the process not block when the data r

Label:Windows Azure Platform Family of articles Catalog In the previous section, I explained that before we did the Azure performance test, we first needed to submit the permeability test sheet 　　Windows Azure Handbook (8) Azure Performance Test (1) Next, the author will introduce the performance test, the need to pay attention to the problems to introduce: (1)

OracleSQL performance optimization Series 2 Oracle SQL Performance Optimization Series 2 The ORACLE tutorial is: Oracle SQL Performance Optimization Series 2. 4. Select the most efficient table name sequence (only valid in the ru