p71 performance

stored in the memory, use the range query to load the first 20% of the data into the memory as hotspot data, for example: select count (*) FROM BT_KV_SHORT_INT_CHAR_10KW WHERE col1 Project Model Number of table records 1KW (3G), 2KW (6G), 5KW (15G), 10KW (30G) Key INT Value CHAR (250) Hotspot data 20% of total data The performance test results are as follows: [Query] The detailed anal

The sameAlgorithmWhy is there an order of magnitude of performance difference? The problem originated from a discussion with a netizen several months ago. This netizen is writing a wedding photo.Program. Generally, wedding photography images are large, even tens of millions of pixels. The problem with this user using C # development is performance. At that time, he was suggested to use xNa for development,

C ++ performance analysis (1): Performance AnalysisC ++ performance analysis (1) Performance problems can not be solved simply by "technology". They are often a comprehensive problem such as architecture, testing, and assumptions. However, an engineer must start from an early stage and solve some small "obvious" proble

Occasionally saw Ali middleware Dubbo performance test Report, I think this performance test report makes people feel that the performance test people do not understand the performance test, I think this report will take the public ditch, so, want to write this article, do a little popular science. First of all, the ma

Tags: time interval fetch number release operation rebuild file GIF world loadThe IO performance of SQL Server is affected by the IO latency of the physical disk and the IO operations performed internally by SQL Server. When monitoring disk performance, the primary measure (metric) is IO latency, which is the time delay in creating an IO request from application to disk to complete the IO request. SQL Serve

, real-time and quasi-real-time, accurate and basic accurate, in many places the performance of the consumption may beA few performance differences. In the system performance optimization, should try to analyze those can not be real-time and incomplete accurate place, make someThe corresponding adjustment, may bring the unexpected huge

Is your J2EE application running slowly? Can they withstand rising traffic volumes? This article describes how to develop high-performance and highly elastic JSP pages and Servlet performance optimization technologies. It means to build as fast as possible and adapt to the increasing number of users and their requests. In this article, I will lead you to learn the proven

modification is complete, use the join () function to create the final string.>>># This is good to glue a large number of strings>>> For chunk in input ():>>> My_string.join (chunk) 3. Use python to assign multiple values and exchange variables.This is elegant and fast in Python:>>> X, Y = Y, XThis is slow:>>> Temp = x>>> X = y>>> Y = temp 4. Use local variables whenever possiblePython retrieves local variables faster than global variables. This means that the "Global" keyword is avoided. 5. Tr