Kungani uhlelo lwe-SQL olukhulumayo ludwaba nge-VPN nokuthi yini okufanele iqoqwe

Ifomu elivuleka ngaphansi kwesekhondi elilodwa kunethiwekhi yasendaweni lithatha amasekhondi amahlanu nge-VPN, kuyilapho ikhophi yefayela kuwona lowo mzila ihamba ngesivinini esigcwele. Umehluko awukho kububanzi bomkhawulokudonsa. Ifomu lilinda ukulandelana kwezimpendulo futhi likhokha uhambo olugcwele lokubuyela emuva esigabeni ngasinye, kuyilapho ikhophi yefayela igcina amabhayithi endizeni ngokuqhubekayo. Bala lokho kulinda ngaphambi kokuthinta umzila wokufinyelela.

Uphawu yisikrini, hhayi umbuzo

Yonke imibuzo kuleso sikrini ingashesha futhi isikrini sisengasala siphuzile, ngoba isamba siyisamba sokulinda hhayi isamba sezikhathi zokusetshenziswa. Isitatimende esisebenza ngamamilisekhondi amabili sisabiza uhambo olugcwele lapho iklayenti kufanele luthole umphumela ngaphambi kokuthumela okulandelayo. Emzileni onokubambezeleka kwamamilisekhondi angamashumi amane, izingcingo eziyikhulu ezincikile zinqwabelana cishe ngamasekhondi amane ngaphambi kokuba noma yimuphi umsebenzi wokudweba uqale. Lesi sibalo siyimodeli yokulinda, hhayi isilinganiso somzila wakho.

Yingakho ukuhlolwa kwesivinini kubonakala kungenacala. Ukudluliswa okukhulu kukala amazinga okugeleza, ifomu elikhulumayo likala ukubambezeleka, futhi i-VPN ingaba ngcono kwelinye ihlale ijwayelekile kwelinye. Ngakho ukuxilonga isikrini kusho ukukala isikrini hhayi umzila.

Rekhoda isikhathi sokuqala kuze kuphele sesenzo esisodwa somsebenzisi ngaphambi kokushintsha noma yini. Leyo nombolo iyisisekelo esisodwa esingakutshela ukuthi ukulungiswa kwakamuva kwasebenza yini.

Bala ukulinda okulandelanayo esenzweni esisodwa somsebenzisi

Kala kuklayenti esikhundleni sokuqagela. Ku-psql, \timing on liphrinta isikhathi esidlulile sesitatimende ngasinye, futhi EXPLAIN (ANALYZE, BUFFERS) likhombisa ukuthi iseva yayichitha malini kuleso sikhathi emsebenzini.

Igebe phakathi kwalezi zinombolo ezimbili iyizindleko zakho zenethiwekhi nezeklayenti. Uma isitatimende sisebenza ngamamilisekhondi amabili futhi iklayenti lirekhoda amashumi ayisithupha, amashumi amahlanu nesishiyagalombili asele awuhambo nokucubungula kwasendaweni, futhi asikho isikhombisi esizowasusa. Phinda lesi sifaniso kuwo wonke umphumela wokuthumela wesikrini futhi uhlanganise izikhala hhayi izikhathi zokusetshenziswa.

Bhala umphumela njengenombolo yokulinda okulandelanayo. Yilo inani izigaba ezimbili ezilandelayo ezingalinciphisa, futhi iyinombolo ongaphikisana ngayo ngobufakazi.

Hlanganisa izingcingo ezizimele, gcina ezincikile

Izitatimende ezimbili ezingawufundi umphumela womunye zingahamba ndawonye futhi ziqoqwe kanye, okushintsha ukulinda okubili kube okukodwa. Izitatimende ezimbili lapho eyesibili idinga inani leyokuqala azikwazi, ngoba ukuncika kungokoqobo futhi ukuhlanganisa kuzoshintsha okwenziwa uhlelo. Hlukanisa izingcingo kuleyo mifantu emibili ngaphambi kokubhala kabusha noma yini, futhi usayizi womfantu ngamunye ukutshela okungenzeka.

Umsebenzi osuselwa kusethi ususa ukulinda ngokuphelele kunokuhlanganisa. Umbuzo owodwa obuyisela imigqa elunakaniselwa isiyingi umugqa ngamunye ususa isiyingi kanye nohambo lokubuyela emuva. Funa isiyingi kuqala, ngoba ngokuvamile iwukuzuza okukhulu nokushintsha okulula ukukubuyekeza.

Iqoqo kusamele ligcine ukusingathwa kwamaphutha kanye nemingcele yokudluliselwa. Ukuhlanganisa izitatimende ezingahlobene zibe umucu owodwa akukona ukulungiselela okuphephile, futhi iqoqo elifihla isitatimende esihlulekile ngemuva kokuhanjiswa okuphumelele libi kakhulu kunokulinda elikugcinile.

Sebenzisa kabusha ukuxhumana ngaphambi kokuthenga ububanzi

Ukuxhumana okusha kubiza ukuxazululwa kwamagama, ukuxhawana ngesandla kwe-TCP, ukuxoxisana kwe-TLS nokuqinisekisa, futhi emzileni onokubambezeleka okuphezulu ngakunye kwalokho kuhambo olunye ngaphambi kokuba umbuzo wokuqala usebenze. Amachibi okuxhumana akhona ukuze lezo zindleko zikhokhwe kanye ngohlelo hhayi kanye ngocingo.

Ku-ADO.NET, ukuvala noma i-dispose yokuxhumana okusechibini kuyibuyisela ukuze isetshenziswe futhi esikhundleni sokuvula okusha komzimba, ngakho iphethini ebukeka njengokuvuza ivamise ukuba ukusetshenziswa okulungile. Qinisekisa ukuthi ichibi lisetshenziswa ngempela esikhundleni sokuqagela: rekhoda ukwakhiwa kokuxhumana komzimba, noma ubheke inani lamaseshini kuseva ngesikhathi isikrini sisebenza. Umhlahlandlela wokusebenza kwe-SQL usho iphuzu elilodwa mayelana nokunciphisa uhambo nokuhlanganisa izingcingo ze-ad hoc ezivamile, kanye nezibonelo eziqondene nesevisi okufanele uzihlanganise nokufakwa kwakho.

Ukufaka echibini kususa izindleko zokusetha futhi kushiya ukulinda kwemibuzo okulandelanayo kungathintwanga. Kuwumbandela wokulinganisa okuhlanzekile, hhayi ukulungiswa ngokwakho.

Kala ukuhambisa ukusetshenziswa eduze kwedatha

Ukusebenzisa uhlelo eduze kwesizindalwazi kufaka esikhundleni sokushintshana okuningi okukude nesizindalwazi ngesikhathi esisodwa sokubonisa okukude. Emthwalweni okhulumayo lokho kungaba ushintsho olukhulu, futhi kuwushintsho lokusebenza olulingana nokushintsha kokusebenza kahle: ukuphathwa kwamaseshini, ukulawulwa kokufinyelela, ukufakwa kwesoftware kanye nolwazi lomsebenzisi konke kuhamba nohlelo.

Kala isikhombimsebenzisi sangempela kanye nedatha eliyidlulisayo ngaphambi kokucabanga ukuthi noma yiluphi uhlangothi lushesha. Isikhathi sedeskithophu ekude sihambisa amaphikseli, futhi isikrini esinezithombe eziminyene singasebenza kabi emzileni ofanayo kunemibuzo eliyifakile esikhundleni, ikakhulukazi lapho iklayenti lidweba kabusha njalo.

Bese uphinda isenzo sokuqala futhi uqhathanise izinombolo ezintathu: ukulinda okulandelanayo, umthamo womphumela kanye nesikhathi sokuqedwa kusuka ekuqaleni kuze kuphele. Ukuthuthukiswa okushintsha umsebenzi womsebenzisi okulinganisiwe ngenkathi kugcinwa ukunemba kwedatha nenqubomgomo yokufinyelela yikho okufanele kugcinwe.