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Tags: suitable for minimum hit use where to go Scale index desc execution planFirst, Introduction1. What is an index?General application system, reading and writing ratio of about 10:1, and the insertion operation and the general update operation rarely appear performance problems, in the production environment, we encounter the most, is also the most prone to problems, or some complex query operations, so the optimization of query statements is obviously the most serious. Speaking of accelerati

performance.Indexes can easily improve query performance by several orders of magnitude.The index is equivalent to the dictionary's Sequencer list, if you want to check a word, if you do not use a sequencer, you need to check from page hundreds of.Index features: Creating and maintaining indexes can consume a lot of time and disk space, but query speed is greatly improved!When creating an index, a series o

Tags: Boost add save Gen HTTP Participation ref show reasonFirst, Introduction 1. What is an index? General application system, reading and writing ratio of about 10:1, and the insertion operation and the general update operation rarely appear performance problems, in the production environment, we encounter the most, is also the most prone to problems, or some complex query operations, so the optimization of query statements is obviously the most serious. Speaking of accelerating queries, you h

procedure delimiter//Create procedure P1 () BEGIN select * from T1; end// delimiter; --Execute stored procedure call P1 () Introduction to index one indexThe index, also called a "key" in MySQL, is a data structure used by the storage engine to quickly find records. Indexes are critical to good performance, especially when the amount of data in a table is increasing, and the impact of indexes on performance becomes increasingly important. Index optimization should be the most effective

orders of magnitude.The index is equivalent to the dictionary's Sequencer list, if you want to check a word, if you do not use a sequencer, you need to check from page hundreds of.Index features: Creating and maintaining indexes can consume a lot of time and disk space, but query speed is greatly improved!2. Index syntaxCreate an index--when you create a table--Syntax: CREATE table table name (field name 1

used MCI commands are:Open deviceClose DevicePlay Start device playbackStop to stop a device from playing or recordingRecord starts recordingSave saves device contentPause pauses the playback or recording of a deviceResume resuming a device that pauses playback or recordingSeek to change the current position of the mediacapacility Query Equipment CapabilitiesInfo Query Device InformationStatus Query device state informationMost of the MCI commands can control different media devices, but the re

Runner.sort, Request.sortwith and sorter.applyyqj2065 soon, they got killed.Sorter.apply (), Request.sortwith () and Sortable.sort () do one thing? Why is it?The Java.util.Comparator interface is a policy class that defines the int compare (t O1, T O2) method. Org.junit.runner.manipulation. Sorter implements Comparatorand @Override public intcompare (Description O1, Description O2) returns as the actual sequencer returns. Okay, all right. What is this

Node CanvasNode Canvas is a plug-in for the behavior tree, which is a graphical operating mode that simplifies the development logic and official documentation is available here.Basic elementsThe principle on the process is that once the return value is true, False it returns upwards. Generally on the BehaviourTreeOwner components, check the Repeat cycle monitoring. Usually these monitoring refers to the conditions of each subtree to judge. The common elements are as follows: ele

KDE mixer used to adjust the volume. GNOME multiplexing is included in the GStreamer multimedia architecture: In the KDE environment, run the following command to install the tool: Debian :~ # Apt-get install alsa-base alsa-utils kmix 3. After installing the relevant software, run the following command to configure the alsa system: 4. debian :~ # Select your sound card as prompted. If you select this option correctly, the prompt message indicating successful configuration of the als

invitation codes. For example: Http: // 192.168.0.5/xssing /? I = 2f4e9f32221 Http: // 192.168.0.5/xssing /? I = a8560261385 Http: // 192.168.0.5/xssing /? I = acab48222ed Http: // 192.168.0.5/xssing /? I = 5a4ff37f0ac Note that the operation at this time is: Open the link from the address of this invitation code to register an account. Source code description of the interface for generating invitation codes: There is nothing to do here. When you enter, there will be no menu bar in the browser

code: The Code is as follows: Var items = $ ('. to_order li'). get (); // obtain all liItems. sort (function (a, B) // call the javascript built-in function sort. The parameter is a closure function, that is, the sequencer.{Var keyA = $ (a). val ();Var keyB = $ (B). val ();If (keyA If (keyA> keyB) return 1;Return 0;});Var ul = $ ('. to_order ');$. Each (items, function (I, li) // at this time, items is the set of queues{Ul. append (li );}); (5) H

shown below: [Serializable]public class SentFrendshipRequestNotificationData : NotificationData{ public string SenderUserName { get; set; } public string FriendshipMessage { get; set; } public SentFrendshipRequestNotificationData(string senderUserName, string friendshipMessage) { SenderUserName = senderUserName; FriendshipMessage = friendshipMessage; }} In the second example, we send a notification to a specific user and pass a specific object. The notification data

program now has three threads, but sold a total of 10 tickets, that is, the use of runnable implementation of multi-threading can achieve the purpose of resource sharing.Runnable the connection between the interface and the thread:public class Thread extends Object implements Runnablefound that the thread class is also a subclass of the Runnable interface. second: thread is the system to your resources, with the thread you have to get the power to execute the time slice from the CPU, thread d

keyboard formatKbdca. KBD-French and Canadian keyboard formatsKbdos. KBD-U.S. keyboard formatKdcolor1.spd-Printer DriverKernel32.dll-32-bit KernelKeyb. com-load the control keyboard program into the memoryKodakce. ICM-Kodak ICC configuration fileKrnl386.exe-core application L BranchLabel. exe-doscommand to set the disk nameLfnbk. exe-backup file with long file nameLfnbk. txt-lfnbk self-report fileLicense. HlP-Windows Help FileLmscript. exe-LAN Manager processing programLogin. exe-Win95 log on t

required by the program to access the MCI. For more information, see the CD. For mcisendstring, the first parameter is a control string. The system fills in the returned information with the second parameter. The third parameter specifies the maximum length of the returned information, if the "Y" flag is set for the MCI device, enter the fourth parameter to return the window handle. Example: Mcisendcommand (DeviceID, mci_close, null, null); // closes an MCI device; Mcisendstring ("Open AAA. Avi

1. Audio Device Files in Linux /Dev/console: The device file related to the speaker. /Dev/DSP: The device file related to the DSP on the sound card device. It provides digital sampling and digital recording functions. The sound card device converts analog and digital signals through DSP. Writing data to the device activates the digital-to-analog converter on the sound card to play the audio. Reading data from the device activates Analog-to-analog conversion on the Sound Card for recording. /De

tostring method. Using objects. tostringhelper, you can easily write useful tostring methods. For example: // Returns "ClassName{x=1}"Objects.toStringHelper(this).add("x", 1).toString();// Returns "MyObject{x=1}"Objects.toStringHelper("MyObject").add("x", 1).toString(); Compare/compareto Implementing a comparator [comparator], or directly implementing the comparable interface sometimes cannot afford to hurt. Consider this situation: class Person implements Comparable 　　 This part of the code i

be used to load firmware. 6. Firmware: firmware of some devices. These firmware are loaded by the kernel through hotplug when appropriate. Firmware is actually a program, and each device is actually an independent embedded system. The sound card is also the same and has its own program. However, to save costs and facilitate upgrades, these devices may only have ram instead of Rom. when starting a device, the system (such as Linux) loads the firmware of the device into the device's Ram, the dev

linear address space is 4 GB.Physical address refers to the address signal indicating the addressing physical memory on the CPU external address bus, which is the addressThe final result address of the transformation. If the paging mechanism is enabled, linear addresses are converted to physical addresses using the items in the page Directory and page table.If the paging mechanism is not enabled, the linear address directly becomes a physical address.Virtual Memory refers to the amount of memor

the same as the mural blocking Room No. 111. Rose can find this room. 5. In the maze leading to the arris room, Rose must remember the map on the wall to arrive. PS: if these are in the game, they are called simple fans. There are many such details in the whole movie. The Director's intention is to make the player feel that this is the sh game. However, the special characteristics of a real game can be used to create more delicate and profound questions. Movies are not as good as games in this