root cause analysis book

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

the readers, IT also demonstrates the use and deployment of some open-source security tools and delivers a positive energy to the IT practitioners. This book featured a special book with Unix/Linux as the main platform, an open source software as the main analysis tool, and Enterprise Network Security O M as the background. The selected cases cover typical atta

of the Internet application servers are architected on the Unix/linux system, and readers need to know about the security cases of these systems. So I am determined to write a book based on Unix/linux , from a white hat perspective, for everyone on the Enterprise network unix/linux system in the face of various network threats, how to find clues to the problem through the log information, repair network vulnerabilities, Build a secure network environ

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.

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

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!

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

waiting events, you can eliminate database issues. If there is a waiting time, you can find the root cause of these events based on different waiting events.For example, latch free and other wait events related to SQL parse, OS performance is high CPU usageDB file scattered read and other wait times related to SQL disk read. The OS performance is that iostat can see an increase in disk read/write volumes.S

, and even to view the information in the System_health event session, I use File_target,ui to read and handle events without manually performing any XQuery. Observe the use of memory It is unheard of for me to be very careful about how to configure Ring_buffer targets on a production server.Two weeks ago, Andy Galbraith encountered an error with all the connections reported to the 701 system with low memory,After analysis, Andy found that in memory 1

Cause Analysis of user disconnection Problems Wu Yu Taiyan Network Studio Rarely participate in weekly third-party meetings. Yesterday, I had to explain a complaint and listened to the complaint for half time. Among them, the most controversial is also the most serious problem of recent complaints, that is, the user disconnection problem. There are many C/S architecture products on the market, and there ar