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Funsaun Database

Hakerek Husi : Ganxibal GC  segunda feira, 17 Juni 2019 | 09.40

Saida maka hanaran Database !!

Exprisaun/Istilah 'database' ilmuhan  barak maka halo definisaun. maibe tuir ita atu buka no'o hatene saida mak naran database, funsaun database/halibur data, ho'o lian bahasa "kumpulan data", Ezemplu Libru, Nomeru Telefone, Registrasaun Funsionariu Publiku no'o seluk-seluk, Nomos funsaun database definisaun hanesan halibur data ne'ebe teritegrasi no'o halo tuir data ne'ebe mak halo ona manipulasaun, hodi nune'e bele foti no'o buka bele hetan lalais data ne'ebe ita persiza iha area office nian.

Database iha mos nia  istruktura mak hanesan tuir mai ne'e :

-Tabela

Tabela funsaun hanesan database ne'ebe halo klasifikasaun tuir regulamentu data nian nomos rai/save iha tabela database tuir orario data nian. Nomos definisaun seluk hateten, halibur data liu husi tabela. Tabela ne'e funsaun hanesan  (Entitas), "kolom & Baris". iha mundu ne'e tuir teoria ne'ebe husi ema ilmuhan sira nia hateten katak, "kolom disebut Feild & Baris disebut Record".

-Constraint

Constraint nia funsaun hanesan fo'o licensa mai ita para atu kontrola intgretasaun data nomos atu hare data ne'ebe rai/save ona iha database. Iha definisaun seluk hateten constraint funsaun hanesan regulamentu "batasan" hodi halo definisaun ba'a valor/data ne'ebe rai ona iha database, liuhusi operasaun INSERT, UPDATE, no DELETE

-Primary Key
primary key nia funsaun hanesan regulamentu ida ne'ebe mak  iha ona, hatudu katak "baris" data ne'ebe iha ona tabela nia laran tenki "Unik"/uniku atu nune'e labele hanesan ho'o  "baris" seluk. primary key nia funsaun mos hodi halo "perbedaan" entre "kolom" .

-Foreign Key

Foreign key nia funsaun hanesan hodi halo definisaun ba'a "kolom" ne'ebe iha tabela laran tuir valor ne'ebe iha ona nomos sei sasin tan ba'a tabela neluk. definisaun seluk foreign key funsaun hodi foti valor iha tabela  seluk  nomos tenki foti liu husi"kolom" ne'ebe sai hanesan primary key / unique, karik ita foti valor mak liu husi foreign key, ne'e hatudu katak server database sei la simu.


Good Luck Friend

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wireles

Teknolojia Wireless ou Wi-Fi (singkatan husi Wireless Fidelity) komprende hanesan standard ne’ebe

uza ba jaringan local nirkabel. Signifika fo asesu atu liga ita bo’ot nia computer ba network uza radio

nia frequensia no la presiza kabel network.

Wireless servisu hanesan uluk iha telp tanba kabel ho antena, ne’ebe trasmite data husi point ida ba

poin seluk liu husi signal radio. Maibe teknolojia wireless presiza ita tenke iha distansia (range)ka

area ne’ebe hetan signal wireless atu bele liga ita nia computer.

Network wireless iha modelu 3 :


Wireless Local Area Network (WLAN): WLAN ne’e network wireless ne’ebe uza gelombang radio.

Network nia backbone/ tulang punggung biasa ne’e uza kabel, ho access point wireless ida ka rua atu

liga users ba network inti ne’ebe uza kabel. WLAN ninia range/ jarak jangkauan bele iha ne’ebe deit,

iha ruangan ou lingkungan kompania.

Wireless Personal Area Network (WPAN): WPAN ne’e network ho jangkaun badak (short-range)

ne’ebe uza teknolojia Bluetooth. Biasa uza atu liga ekipamentu sira ne’ebe mak iha Bluetooth atu liga ba kompania nia WPAN. Distansia (range) WPAN biasanya besik 30 M.


Wireless Wide Area Networks (WWAN): WWAN kria liu husi signal mobile, biasanya oferese husi

Mobile Service Provider hanesan Timor Telecom. WWAN bele liga ita nia computer husi Network

Lospalos mai Network iha Dili, shared folder iha network ida-idak bele asesu normal hanesan iha

LAN. MAIBE ninia presu mak oin seluk uituan, depende ISP ida-idak.

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jaringan

Komprensaun husi jaringan LAN mak jaringan husi total komputer nebe mak iha ligasaun husi komputer ida ba komputer seluk tan ne dibatasi husi ninia lokasi nebe iha distansia nebe tertentu. kona ba funsaun nia sudah pasti, jaringan LAN funsaun bele komputer ida hetan liggasaun ho komputer sira seluk bele troka dadus no fahe perankat  keras sira seluk.

Atu halo jaringan LAN ida iha material nebe mak ita presija mak ; tuir mai iha peralatan ou material nebe mak ita uja atu halo jaringan LAN:

1. PC rua ou bele liu husi rua
2. Network Cardtenke hanesan ho PC
3. Cable koaksial ou UTP
4. Hub
5. Terminator
6. T-Conector

dezenho monta jaringan LAN

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