five whys root cause analysis

Performance problems may be difficult to diagnose and fix. Problems often occur in the most unexpected situations. In general, problems may evolve and sometimes lead to database application interruptions. From the DBA's perspective, it is important to be aware of taking proactive measures to solve the problem before the performance begins to cause damage to the business. Performance problems may be difficult to diagnose and fix. Problems often occur i

efficiency. A tired body may cause inattention, worse response, no eye, poor color, yawning, and bad breath. These will be left unrespected in the eyes of customers, very poor impression. Therefore, while paying attention to your performance, you should also pay more attention to your health conditions, cultivate good habits, and take full rest. If you spend 24 hours a day to make money, you need to spend money. How can you improve your time

to set up professional analysis institutions to monitor market data trends in real time to explore the appropriate operating time, master the International mainstream financial analysis and evaluation of the consultation report channels to grasp the first-hand information to help customers to win the market, senior CFA registered analyst team to provide comprehensive real-time guidance for customer operati

, therefore, it does not have the conditions for generating another deadlock .) 4. how to prevent deadlocks To prevent deadlocks, we must follow the following principles during the development process: 1. avoid concurrent execution of statements involving data modification. 2. Each transaction is required to lock all the data to be used at a time, otherwise execution is not allowed. 3. define a locking order in advance. all transactions must block the data in this order. For example, the update

MySQL tutorial connect to server at ' localhost ' failed error cause analysis /usr/local/webserver/mysql/bin/mysqladmin:connect to server at ' localhost ' failedError: ' Access denied for user ' admin ' localhost ' (using Password:yes) ' According to the instructions, is the user name and password is incorrect, if you remember your username and password directly reset password user name on the OK. If you

Deer pill will not be a polynomial source: http://www.cnblogs.com/hechao123 reprint please contact me first.First, the problem descriptionPre-array We because of the B machine room fault, will all the traffic cut to a room, after the push + natural peak, a room all the servers have Java threads approaching 1000 (1000 is the set max value), at night 7 o'clock more observation, Java thread number slightly decreased, but still have 900 +, and at this point, the TPS for a single server is maintained

not passed in the string format. In this case, two of them are strings. Therefore, the character set is related. Returning to the two table structure, it is found that the declaration of the S field is different from the COLLATE Utf8_bin-this is the root cause of this case: the S value of a table is Utf8_bin, the optimizer considers that the type differs and cannot be used directly on index B. ix_s filter.

to an ip address. At the beginning of this period, I thought it was the reason for proxy. I turned off the computer proxy. Still not good, and then changed to 127.0.0.1 access, found that can access, with 0.0.0.0 access can also be, that is, the ip is not good. Then there will be a variety of google and Baidu. Other people's methods-They tried a lot and found that they were ineffective (a little skeptical about life, maybe my computer problems), but the result is here, ip is not accessible !!!!

of the constructor,inside the fragment constructor, the ArrayList is stored as parcelable in the bundle, which is read from the bundle when the fragment is initialized, and is thrown when the amount of data is large. Transactiontoolargeexception.6) Solution: pass ArrayList to fragment constructor when building fragment instance, no need to read from bundle when fragment is loaded, avoid transactiontoolargeexception, and improve the efficiency of program execution. 7) SummaryTransactiontoolarge

termination failed to kill one or more processes Trace file analysis (trace too long extract key parts):SERVICE NAME: (sys$background) 2015-10-21 03:22:11.264Session ID: (1646.3) 2015-10-21 03:22:11.2642015-10-21 03:22:11.264Unable to get Enqueue on resource cf-00000000-00000000 (GES mode req=3 held=6)Possible local blocker ospid=367 sid=1648 sser=1 time_held=37 secs (GES mode req=6 held=4)Dump local blocker:initiate state dump for KILL blockerPossi

In mysql, if we use the floating point type for result calculation, we will find that the calculation result is different from the actual result. why? This article introduces the cause analysis and solution of mysql floating point calculation error. For more information about the coders, see. When performing financial and other numeric operations, use the decimal type instead of the float and double types!

The cause analysis of the company's website malfunction1.17:20 minutes or so some pages appear MySQL error.650) this.width=650; "src=" http://s3.51cto.com/wyfs02/M02/27/64/wKiom1Nyt4ngN_LvAACxlVsRvvE512.jpg "title=" 1.png " alt= "Wkiom1nyt4ngn_lvaacxlvsrvve512.jpg"/>this bandwidth situation. 2. traffic monitoring shows that 101.66.246.22 consumes a lot of bandwidth, resulting in full bandwidth. Block the IP

staight_join. So Far We found that the logic of the entire error is as follows: the execution plan of a-driven table, due to index B. S rows is estimated to be 1038165, which leads the optimizer to think that the cost is greater than that of the drive Table B. In fact, the differentiation of this index is 1. (Of course, the students who are familiar with the explain results find that the type field in the second row is different from the Extra field.) that is to say, when each row obtained by s