rn notes 4th edition

Rollback Two standard row-level locks Shared Lock: S lock, transaction T1 acquires S lock of R row, transaction T2 can also get S lock of R row Exclusive lock: x Lock, Transaction T1 acquires S lock of R row, transaction T2 cannot get X lock of R row, transaction T1 acquires X lock of R row, transaction T2 cannot get x/s lock of R row Vii. Business1. Isolation level Read NOT submit Read and submit Avoid dirty reads: One transaction reads d

regular expressions defined in literal form/* * Match all ". At", case insensitive */ var pattern4 =/\.at/gi;002 RegExp constructor to create a regular expression/* * Same as PATTERN1, but created using the constructor function */ var New RegExp ("[Bc]at", "I");ECMAScript 5 explicitly stipulates that the use of regular expression literals must be the same as calling the RegExp constructor directly, each time creating anCreate a new RegExp instance.5.5 Function typeThe function is actually an ob

same time.When the animation method is applied in a chained way, the animation occurs in order (unless the queue option value is false).(2) animation effects on multiple sets of elementsBy default, animations occur at the same time.When the animation is applied in the form of a callback (including the animation's callback function and the queue () method's callback function), the animation occurs in the order of the callback.In addition, in the animation method, note that other non-animation me

: "200px"},3000) ;});Other animation methods 1, Toggle (Speed,[callback]) Method 2, Slidetoggle (Speed,[easing],[callback]), 3, FadeTo (Speed,opacity,[callback]); 4, Fadetoggle (Speed,[easing],[callback]);1, toggle ()The visible state of the switchable element$ ("#panel h5.head"). Click (function() { $ (this). Next (). Toggle ();});Equivalent to:$ (function() { $ ("#panel h5.head"). Toggle (function() { $ (this ). Next (). Show ("Slow"); },function() { $ (this). Next (

integer (depending on the case, usually 1) fromCharCode (), receives one or more character encodings, converts to strings, and performs the opposite operation with charCodeAt () URI (Universal Resource Identifier) Methods: Encodeuri,encodeuricomponent,decodeuri,decodeuricomponent, encoding and decoding, decoding methods can only identify their corresponding coding methods Eval (), converts the string parameter that is brought into the executable statement and inserts it into the current pos

timeCustom attributes allow you to associate custom metadata with program elements that are created during compilation,and embedded in the assembly.Reflection is a common term that describes the function of checking and handling program elements while running.15.2 Custom FeaturesThe attribute class attribute itself is marked with an attribute--system.attributeusage attribute.AttributeUsage is more like a meta attribute because it can only be applied to other attributes and cannot be applied to

Chapter III host planning on disk partitioningIDE HDD/dev/hd[a-d]SCSI/SATA/USB/DEV/SD[A-P]USB Flash Disc/dev/sd[a-p] (same as SATA)Floppy disk drive/dev/fd[0-1]Printer 25-pin:/dev/lp[0-2]USB:/DEV/USB/LP[0-15]Mouse Usb:/dev/usb/mouse[0-15]Ps2:/dev/psauxCurrent Cdrom/dvdrom/dev/cdromThe current mouse/dev/mouseTape drive IDE:/dev/ht0SCSI:/dev/st0Fourth Chapter 4th, installing CentOS 5.x and multi-boot tipsFile system typeEX2/EX3: Is the type of file syst