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MySQL is a powerful open-source database. With more and more database-driven applications, people have been pushing MySQL to its limits. Here are 101 tips for adjusting and optimizing MySQL installation. Some of the techniques are specific to the installation environment, but these ideas are generic. I've divided them into several categories to help you master more of the tuning and optimization techniques of MySQL. MySQL server hardware and operating system tuning:

The laserdesignator with the OFP original configuration is too big to carry, and it is very ugly to carry, and affects my carrying other equipment(How do people carry a backpack on a radio station with such a big tripod? The battery also occupies three of my poll ). (This issue is also reported in Iraq:Many soldiers do not like the tripod of the gltd II system. They think it is too heavy to carry.From --Marine Corps investigation report in IraqOFP is

Android4.4 CTS test Fail item modification Summary (1), android4.4cts 1. Test android. webkit. cts. GeolocationTest Fail. Tip: cts-tf > run cts --class android.webkit.cts.GeolocationTest12-13 16:55:23 I/TestInvocation: Starting invocation for 'cts' on build '4.4_r3' on device 385b4e4a12-13 16:55:23 I/385b4e4a: Created result dir 2014.12.13_16.55.2312-13 16:55:34 I/385b4e4a: Collecting device info12-13 16:5

Gb), and the memory can be written first. When writing transaction logs, the sequential Io is much faster than the random Io for modifying data. At the same time, innodb_flush_log_at_trx_commit does not synchronize the write operation with the transaction, but executes it once per second to further improve performance. Innodb_flush_log_at_trx_commit (this is useful)Why is InnoDB 100 times slower than MyISAM? You probably forgot to adjust this value. The default value

1, install, uninstall test installation, uninstall test mainly for the post-compilation source program apk installation files generated by the main test point: 1. The generated APK file can be installed and downloaded on the real Machine 2). General installation tools such as Pea Pod and 91 Assistant can install and uninstall the program 2, online upgrade test Verify digital signature, upgrade can be used n

total. Launcher: number of cells that spanx = "4" occupies on the X axis. "4" represents 4 cells. Launcher: number of cells that spany = "2" occupies on the Y axis. "2" indicates 2. Daming Original: Reprint please indicate the source: http://blog.csdn.net/wdaming1986/article/details/6978814 Compilation instructions: (1) build first. If you have any questions, refer to compiling the source code for Android in Linux [Android Evolution ]; (2) After mm

) 1.3 AMS1117 Package Type SOT-223 TO-252 SO-8 three-port adjustable or fixed output voltage 1.2v,1.5v, 1.8V, 2.5V, 2.85V, 3.3V and 5.0V output current 1 A working differential pressure low to 1V line load regulation: 0.2% Max. Load regulation: 0.4% Max. Optional sot-223,to-252 and SO-8 package (2) crystal oscillator for external timing three. Motherboard design (1) Power Module driver Board and motherboard

consumption of only 360nA. It also includes intermittent sleep mode that requires dozens of milliseconds of refresh, such as a liquid crystal display driver. Therefore, MSP430 's ultra-low power consumption is more suitable for use in battery-powered instruments, instrumentation products.3rd, the 51 core microcontroller because its internal bus is 8-bit, by its structure itself is very limited, analog function control function is restricted. MSP430 s

20165218 2017-2018-1 "Java program design" The third week study summary textbook Learning summary-fourth chapter class and object oriented object language The first thing to do when you need to do something is to think about who is going to accomplish the task, which object is going to accomplish the task, and what the data is about. ———— "Java 2 Practical Tutorial" P51 Three properties of object-oriented programming: encapsulation, inhe

Linux power Management (1) _ Overall architecture (transfer fromwww.wowotech.net, Snail's Nest technology)1. PrefaceIn this world, the operation of any system requires energy. If a tree relies on light to grow, as a horse relies on food to run, as a computer system relies on electricity. and energy acquisition is a cost, so if the system can be guaranteed to operate on the basis of minimizing energy consump

broadcastreceiver process can easily be killed when the system needs memory because it belongs to the empty process (the process without any active components). If its host process is killed, then the working child thread will be killed. So using sub-threading to solve is unreliable The dynamic registration of the broadcast receiver also has the feature that when the activity used to register is turned off, the broadcast fails. Static registration does not need to worry about whether t

. Even after the system is turned off, it can also rely on the power supply provided by the micro-battery on the motherboard to maintain the system time. When the system starts, the kernel initializes the wall time by reading RTC, which is stored in the xtime variable. The system timer is the most important role in the kernel timing mechanism. It provides a periodic interrupt trigger mechanism. 5. clock interrupt handling program The clock int

I. system conventions 1. System Environment CentOS-4.4.ServerCD: Linux Apache: 2.2.4 MySQL: 4.0.26 PHP: 4.3.11 Zendoptimizer: 3.2.2 PhpMyAdmin: 2.10.0.2 2. source code package storage location:/usr/local/src# Why should we perform tarball in/usr/local/src? This is just a convention, because as a result, everyone is installed in this place, and the maintenance and handover of the host will be very simple in the future, in addition, it will be helpf

One. Android App type:(1) Foreground application-need to consider activity life cycleCan only run in the foreground app, when he is not visible will be suspended, for example: Game application;(2) Background applications--service and broadcastreceiver are drivers of background applicationsAn application with a very limited interaction, unless during the configuration, the other life periods are hidden, for example: alarms;(3) Intermittent application-

linux0.11 Source Analysis 1 bootsect.s file Analysis from Power-on power-up to the process of performing the main functionSince the linux0.11 system was stored on a floppy disk, the main purpose of the power-adding process was to load the operating system from the boot disk to complete the preparation of the main function. Starting from boot to Mian function is divided into three parts: The first part is to boot the BIOS and prepare Real ModeInterrup

Data center data center design and technical balance of various specialties (1) 1. Data Center Model Introduction The data center is a place that provides an operating environment for electronic information equipment. It can be a part of a building or building, including the primary data center, auxiliary area, support area, and administrative area. The typical data center model

. Samplingprofilerintegration.start (); Registerzygotesocket (); Eventlog.writeevent (Log_boot_progress_preload_start, Systemclock.uptimemillis ()); Preload (); Eventlog.writeevent (Log_boot_progress_preload_end, Systemclock.uptimemillis ()); Finish profiling the zygote initialization. Samplingprofilerintegration.writezygotesnapshot (); Do a initial GC to clean up after startup GC (); If requested, start syst

There are many things worth learning about in Linux. Here we mainly introduce the Linux daemon process. The Linux daemon process is still quite common. So I studied the Linux daemon process, I would like to share it with you here and hope it will be useful to you. Through my introduction, you will be able to understand the Linux daemon process. 1. Introduction to the Linux daemon1. alsasound: the Alsa audio card driver daemon. The Alsa sound card driv

and limited space; 2. Expensive melting machine and high construction costs; 3. Active construction, limited battery endurance; 4. Large Size and inconvenient carrying of Hot-melt equipment; 5. It takes a long time to separately connect FTTH terminals. Advantages of the quick connector: 1. simple operation, only one time for optical fiber stripping, fast construction; 2. No special requirements for the ope

With the development of sensor technology, embedded technology, distributed information processing technology, and wireless communication technology, wireless sensor networks (WSN) composed of a large number of micro-sensor nodes with micro-processing capabilities have gradually become a hot issue in the academic field. The US Business Weekly and MIT technology comments listed wireless sensor networks as one of the most influential technologies in the 21st century and one of the technologies tha