Domov technika Storage capacity

Storage capacity



Meaning

Thestoragecapacityofthealgorithminthedatastructurereferstothemaximumstoragespacerequiredduringtheexecutionofthealgorithm.Itincludesthefollowingthreeparts:1.Thespaceoccupiedbytheinputdata;2.Thespaceoccupiedbytheprogramitself.3Spaceoccupiedbyauxiliaryvariables.

Storageunit

Thisistheproblemofthestorageunitofinformationinthecomputer:

Amongthem1024=2^10(2tothe10thpower,convenientforbinarycalculation)

1bit=1bit(bitabbreviatedasbpayattentiontolowercase)

1byte(ByteabbreviatedasBpayattentiontouppercase)=8bits(bit)

1Kilobyte(KB,Kforshort)=1024bytes(B)

1Megabyte(MB,Mforshort)=1024kilobytes(KB)

1gigabyte(GB,Gforshort)=1024megabytes(MB)

1terabyte(TB,Tforshort)=1024gigabytes(GB)

1piebyte(PB)=1024terabytes(TB)

1exabyte(EB)=1024piebytes(PB)

1zettabyte(ZB)=1024exabytes(EB)

1Yaobyte(YB)=1024zettabytes(ZB)

ThestorageunitthatwecangenerallyuseisalsoItcanonlyreachterabytes(TB).

Thecommonlyusedcomputermemoryis2GB,4GB,8GB,16GB.Commonlyusedharddrivesare500GB,1TB,1.5TB,and2TB.

Mobilephonememoryiscommonlyused2G,3G,4G,andmobilephonememorycardsarecommonlyused8G,16G,32G,64G,128G.Thiscardisoptional.

Thereare1G,2G,4GM,8G,16Gmemorycardsfordigitalcameras.

Newrecord

AlthoughthePCstoragefieldaroundusisalreadydominatedbyharddisksandevensolid-statestorage,manycompanies,medical,governmentandotherfieldsthatrequirelarge-capacitylong-termstorage,Thetapedrivestillhasroomforitssurvival.TheIBMZurichLaboratoryinSwitzerlandannouncedafewdaysagothattheyandJapan'sFujifilm(Fujifilm)companyhavecreatedanewstoragedensityrecordinthefieldofmagnetictape.

ThestoragedensityofthistapesampledemonstratedbyIBMreaches29.5Gbpersquareinch,whichis39timesthatofcommontapedrives.Thestoragecapacityofeachreeloftapesupportedbythistechnologycanreach35TB,whichis44timesthatofthefourth-generationIBMLTOtape.

Toachievethisbreakthrough,researchershaveappliedanumberofnewtechnologies.ThefirstistheNANOCUBICtapeprovidedbyFujifilm,whichusesbariumferriteasamagneticmediumtoincreasethestoragedensity.NextistheprecisemagneticheadpositioningtechnologydevelopedbytheIBMZurichLaboratory,whichhasincreasedthenumberoftracksonthetapeby25times.Thenewsignalprocessingalgorithmreducesreadandwritenoiseandincreaseslinearstoragedensityby50%.Coupledwiththeapplicationofgiantmagnetoresistancetechnology,today'srecordstoragedensityhasfinallybeenachieved.

Databasestoragecapacity

ThedifferencebetweenAccessandSQLdatabasesisverybig.Oneisadesktopdatabaseandtheotherisenterprise-leveldata.However,Ifeelthatitisnotnecessarytobefamiliarwiththesedetails.Itisbesttolearnandmasterinpractice!

Pleaserefertothedetailedparameterdifferencesbetweenthefollowingtwodatabases:

ACCESS2000Chineseversionspecifications:

Attributemaximumvalue

MicrosoftAccessdatabase(.mdb)Thefilesizeis2Gbytes.However,sincethedatabasecanincludelinkedtablesinotherfiles,itssizeisactuallyonlylimitedbytheamountofavailablestoragespace.

Thenumberofobjectsinthedatabase32,768

Modules(includingformsandreportswhoseHasModulepropertyisTrue)1,000

Thenumberofcharactersintheobjectnameis64

p>

Thenumberofcharactersinthepasswordis14

Thenumberofcharactersintheusernameorgroupnameis20

Thenumberofusersis255

MicrosoftAccessprojectgeneralSpecifications:

MaximumAttributes

ThenumberofobjectsintheMicrosoftAccessproject(.adp)is32,768

Modules(includingformswiththeHasModuleattributeasTrue)andReport)1,000

thenumberofcharactersintheobjectname64

MicrosoftAccessdatabasetablespecifications:

attributemaximum

tablenameThenumberofcharactersis64

Thenumberofcharactersinthefieldnameis64

Thenumberoffieldsinthetableis255

Thenumberofopentablesis2,048.Theactualnumberoftablesthatcanbeopenedmaybeless,becauseMicrosoftAccessalsoneedstoopensomeinternaltables.

Thesizeofthetableis1Gbytes.

Thenumberofcharactersinthetextfieldis255

Thenumberofcharactersintheremarkfieldis65,535inputthroughtheuserinterface,andinputthroughtheprogramItis1Gbytes.

ThesizeoftheOLEobjectfieldis1Gbytes

Thenumberofindexesinthetableis32

Thenumberoffieldsintheindexis10

ValidThenumberofcharactersinthesexmessage255

Thenumberofcharactersinthevalidityrule2,048

Thenumberofcharactersinthetableorfielddescription255

Thenumberofcharactersintherecord(ExceptformemofieldsandOLEobjectfields)2,000

Thenumberofcharacterssetbythefieldpropertiesis255

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