elasticsearch query performance tuning

of queries, a large amount of memory may be wasted. This is certainly not what our database administrator wants to see. In practical work, we often need to have a balance between the two. Set a reasonable parameter to make the database less likely to have disk sorting and not overload the server memory. To this end, I have a suggestion. The database administrator should increase the value of this parameter every once in a while and use the Statspack tool to monitor the memory sort and disk-sort

Tools.jar class library. The JKD development team has chosen to use Java code to implement these monitoring tools for a reason: When an application is deployed to a production environment, it can be limited either by direct contact with the physical server or by remote telnet to the server. With the help of the interface inside the Tools.jar class library, we can implement powerful monitoring and analysis performance directly in the application. The

performance testing process. Below I will introduce three tools that are frequently used in the performance tuning process of msyql: 1. Slow query (analyze problematic SQL statements) 2. Explain (shows how mysql uses indexes to process select statements and connect tables. Can help you select better indexes and wri

Mysql Tomcat C3p0 System Performance Tuning personal summary, System Information The application logic is to use c3p0 to query data in the database and return Json data over http. 1. the initial test result JMeter test result before optimization No. Type Original 1000 data bigger 1 500 Connection 250

I. Analysis Phase In general, there are often too many areas of concern in the system analysis phase, system functionality, availability, reliability, security requirements tend to attract most of our attention, but we must note that performance is a very important non-functional requirements, must be based on the characteristics of the system to determine its real-time requirements, response time requirements , hardware configuration, and so on. It

stored in the cache can be re-used, and if there is room in the cache when disconnected, the client's thread will be placed in the cache.# If the thread is requested again, then the request will be read from the cache, if the cache is empty or a new request, then the thread will be recreated, if there are many new threads,# Increasing this value can improve system performance. You can see the effect of this variable by comparing the variables of the

Method One: Caching data in the Init () method of the Servlet After the application server initializes the servlet instance, it invokes the Init () method of the servlet before servicing the client request. In the lifecycle of a servlet, the init () method is invoked only once. System performance can be greatly improved by caching some static data in the Init () method or by completing some time-consuming operations that need to be performed only onc

Document directory Preliminary steps Using bind variables There are several relatively easy steps you can take to improve performance. From the user's perspective, one of the most frequently used interfaces with a database involves SQL statements, so getting a handle on them is a good place to start, in terms of being able to see an immediate improvement. -->Oracle perfor