elasticsearch performance tuning

Label:Original: SQL Server database Performance tuning tipsThe reasons for the slow query are many, and the following are common: 1. No index or index is not used; 2, I/O throughput is small, forming a bottleneck effect; 3, insufficient memory; 4, the network speed is slow; 5, the amount of data queried is too large; 6, lock or deadlock; 7, the return of unnecessary rows and columns; 8, query statement is n

user data on each disk, Causing greater I/O rates to the physical disk and allowing disk bottlenecks to occur. The most common disk bottleneck is that the hard disk is too small; Most disk configurations are based on capacity requirements rather than performance; The cheapest solution may be a small number of large-capacity disks; The second most common problem is having too handle logical disks on the same array. This increases seek time and signif

From January Google released 16 series of video on performance optimization, this period of time in the major communities have seen a lot of excellent articles about the optimization series. We have analyzed the causes of performance, shared how to optimize our applications, and introduced tools to help us detect performance issues.One of the tools that is descri

PrefaceA project in the development, testing, on-line, then the size of the user is still relatively small, so just on-line projects are generally stable performance. However, with the passage of time, the increase in the number of users, the increase in QPS and other factors will cause the project slowly show a half-day unresponsive situation. In the previous work also happened to encounter this process, at that time, the project carried out a lot of

Lao Li share: Performance tuning operating system-level load analysisThe load is broadly divided into two categoriesA.CPU loadB.I/O loadIf an application needs to perform large-scale computations, although the program and disk do not have data I/O, it can take a long time to complete processing, mainly because the program relies on CPU computing, which creates the load pressure on the cup, which is called a

Performance Tuning Experience SummaryThe problem arises:In the daily environment, a server, for example, the machine's number of visits per second is around 368, the maximum number of visits at 913. The performance of the external service is that every two or three hours there is a second level of time client request timeout, in the case of increased traffic, the

compressing and extending the heap space:-xx:minheapfreeratio: Sets the minimum idle scale for heap space. The default is 40. When the free memory in the heap space is less than this value, the JVM expands the heap space.-xx:maxheapfreeratio: Sets the maximum idle scale for heap space. The default is 70. When the free memory in the heap space is greater than this value, the heap space is compressed and a smaller heap is obtained.When-xms and-xmx are equal, both parameters of-xx:minheapfreeratio

Performance Tuning for Nginx1 Modify the core number of CPUs corresponding to the Nginx work process this is generally your CPU core number of twice times, founder is multiples, specific to several times to see the specific hardware configuration2 Modifying the file descriptor 65536 ulimit-n Permanent effect can be changed/etc/sysctl.conf3 Modifying the Linux kernel scheduling algorithm Epoll4 Modifying the

First, the main method of neural network performance tuning the technique of data augmented image preprocessing network initialization training The selection of activation function different regularization methods from the perspective of data integration of multiple depth networks 1. Data augmentation The generalization ability of the model can be improved by increasing the amount of data without changing t

operations, SQL operations, list refreshes, etc.) consume resources using the background process to implement, can not occupy the UI thread, the UI thread is the main thread, the main thread is the key to keep the program smooth, should only operate those core UI operations, such as processing view properties and drawing; Minimize the wake-up mechanism. We often use broadcasts to receive messages and events that are expected to respond, but too much of the response exceeds our own requireme

Go language Development (eight), go Language program testing and performance tuning Introduction of the Go Language Automation testing Framework 1. Introduction to Automated testing framework The testing of the Go Language standard package provides a framework for unit testing (functional testing) and a common approach to performance testing (stress testing) that

A collection of Java performance tuning tipsBrother LianResources available for program utilization ( memory,CPU time, network bandwidth, etc. ) is limited, the goal of optimization is to allow the program to complete the scheduled tasks with as few resources as possible. Optimization usually consists of two parts: reducing the volume of the Code and improving the efficiency of the Code. The main discussion

In the project, we are busy with the implementation of the function, the overall performance of the app is poor. Every page load is stuck. The summer vacation is coming soon, and the project team has specially arranged a version to improve the performance. The version hasn't started yet, and I'm here to record some of the performance

This article is a systematic summary of the consumption analysis in performance tuning.For additional space on the Performance tuning series, see.Performance Tuning: CPU consumption analysisPerformance tuning: IO consumption analysisPerformance

. Create_snapshot; We can also use the Dbms_workload_repository package to complete the baseline, the default settings and other operations.ADDM (Automatic Database diagnostic Monitor AWR)Oracle is an internal consulting system, can automatically complete the most database of some optimization recommendations, giveSQLThe optimization, the creation of the index, the collection of statistics and other suggestions.ADDM report Generation:Sqlplus>@?/rdbms/addmrpt.sqlThe most important part of Oracle

of disk sorting will be greatly increased. This is mainly because at the end of the month, users will make statistics on the transaction data for the month. So at the beginning of the month, because of the number of transactions, so there will be more disk sorting occurs. In this case, it is necessary for the database administrator to adjust the relevant parameters. However, this adjustment is a temporary adjustment, until the cycle has passed, still need to transfer the parameters back. Only i