postgres analyze

Demand motivation: Solving OOM (Object out of Memory) problems and system tuning 1. How to generate Java heap dump Java heap dump files are generated when there are too many objects in the JVM and the Java heap (Java heap) is depleted. Alternatively, you can use a tool or command to display the file. The ctrl+break can be generated by using the command line during program execution, with tools such as IBM Heapanalyzer, Sap Memory Analyzer, and Eclipse Memory Analyzer generating dump files in th

background: leisure time read a few about JS scope chain and closure of the article, and occasionally saw a problem encountered before, is in the For loop for the DOM node registration event driver, see the following code: According to the normal idea, the result should be to click 3 buttons respectively to hint "Anchor1", "Anchor2", "Anchor3"; at the beginning of the period I think so, but the result is no matter what button clicked, will prompt "Anchor4". What is this for? Don't

Let's take a brief note. Today, helping colleagues guide the data, from the development environment to the test environment, found that a query is slow. See the execution plan, and found that the full table scan (about 300w records in the table), why not use the index, view the index status, everything is normal. Dizzy.Must be the index of the problem, first analysis of the table to say.Analyze table Ysgl_compile_reqsub Compute statistics for all indexes; It's normal. -------------------------

End | 0.000057 | 0.000000 | 0.000000 | | Closing Tables | 0.000061| 0.000000 | 0.000000 | | Freeing items | 0.000080 | 0.000000 | 0.000000 | | Logging Slow Query | 0.000056 | 0.000000 | 0.000000 | | Logging Slow Query | 0.000098 | 0.000000 | 0.000000 | | Cleaning Up | 0.000059 | 0.000000 | 0.000000 | +------------------------------+-----------+----------+------------+ rows in Set (0.00 sec) Ps:Show profiles all for QUERY 2 can also be obtained by using the SELECT * from information_schema.p

/1_4_883536782.dbf --Start Log miner add logs to analyze Sql> Execute dbms_logmnr.add_logfile (logfilename=> '/oracle/arch1/1_2_883536782.dbf ', Options=>dbms_ logmnr.new); Pl/sql procedure successfully completed. --Add logs to be analyzed Sql> Execute dbms_logmnr.add_logfile (logfilename=> '/oracle/arch1/1_3_883536782.dbf ', Options=>dbms_ Logmnr.addfile); Pl/sql procedure successfully completed. Sql> Execute

free tools presented in this article! They were: 1, the use of Google Analytics tracking the source of visitors, and they have clicked on which site links Google Analytics (Analytics) is an enterprise-class network analysis solution. Not only does this tool give you a better understanding of site traffic and marketing, but it also offers a powerful, flexible and Easy-to-use feature that lets you view and analyze traffic data in a new way. With Go

In September, Shenzhen website analysis and sharing activities, a friend asked the customer calls tracking content, at that time I made some simple answer, but the answer is not very systematic. Use this article to make some deep sharing with you. Google Analytics is currently not able to track the offline activity data, so, the successful implementation of the user call tracking scheme requires the Web analytics tools and a number of third-party service providers combined services, foreign com

Today a little bit of free, originally want to see what the Web page, helpless boss sits, had to open the "CLR VIA C #" Some places are a bit confused, ready to knock code to try, open the learning project, suddenly found that there was a before see "Deep C # Memory management to analyze value types reference types, boxing unboxing, stacking the differences between several conceptual combinations" legacy issues The code is like this. in

difference in the way the return was written, the two codes are almost identical, so we infer that it is no doubt that the form of new string gives our functions an unexpected effect. Why is that? Originally, in JavaScript, as long as the new expression after the constructor returned (return) of a primitive type (no return is actually the original type undefined, such as (1)), such as the first (2), Then return the anonymous object created by new, and if the constructor after the new expressio

) call F addl $,%eax Leave RET ——————————————— Everyone, I'm still a split-line ————————————————— Now analyze the execution process of the assembly code and the stackFirst, the meanings of each register are shown in the following illustration: Common assembly statements have the following meanings: * Note: Picture screenshot from the course provided courseware, if you want to learn more about register related knowledge, pleas

Web page Someone wants to pull the Web page down and extract the contents. This is actually a search engine's most basic work: Download, extract, and then download. I did a search engine project in my early years, but the code is gone. This time someone asked me this thing again, I have saved two methods. method A, download the Web Page in a WinForm with a hidden browser control, and use IHTMLDocument to analyze the content. This method is relatively

The site is k is a more common problem, in my website to optimize the job, the first time to see their site was K so powerful, this is nearly one months, the site is still no progress. I asked in the major forums, how to restore the K site. Also detailed analysis of the reasons for the site, also did not find specific measures to solve. Site after k webmaster should analyze what problems to restore the site First question: see if there is a lot of j

The enemy can win. If we want to Changjiang, we should analyze the "front wave". In the search engine, the competitor is our front wave, if we want to surpass them, the rank is more forward, must have the merit which surpasses them. I would like to share the following from the master to steal division from the analysis of competitor operations: 　　A detailed analysis of the domain name 　　 It is necessary to view the history of a competit

current page is indexed by search engines. If you want to link the query to see if this link is valid, read the article example to analyze how to tell if the chain is an effective chain? In contrast, plain text links don't seem as hard to do as hyperlinks. In this way, why do not we have a pure text link to achieve the ultimate, the above three methods, just and you share some of the ideas of plain text links. To do a good job of plain text links, y

highest clicks, the budget will be quickly consumed, it will depart from the original original intention and evolved into a strong blood spell. So what if we have the highest effect at the lowest price? From the previous week and one-day Baidu search show number of maps can be found, the site's user groups through Baidu search site access time is mainly concentrated in Monday to Friday from 10 o'clock in the morning to 12, 16 o'clock in the afternoon to 18 o ' clock and 23 o ' clock at night. S

Recently found that many seoer novice do not know their site is to do traffic or do conversion rate, some web traffic came up but there is no conversion rate, and some sites obviously want to transfer rate, but to do the flow, the result has no conversion rate, and some sites and the rate of conversion, and not know their ultimate goal, Thought can be included in both directions, the results jump rate increased, the site was down right, now Wu Xiaohua to ana