
sthirata (databases pranali)

databases pranaliyon mein, sthirata (yaa shuddhata) iss aavashyakta koo sandarbhit karati haye kii kissy bhee databases lenden koo prabhaavit detta koo kewal anumat tarikon seey badalana chaahiye. databases mein likhaa gayaa koee bhee detta sabhi paribhaashit niyamon key anusaar maanya honah chaahiye, jisamen baadhaaen, cascade, triggers aur unake kissy bhee sanyojan shamil hain. yeh sabhi tarikon seey lenden kii shuddhata kii guaranti naheen detaa haye joe aavedan programmer chaahata thaa (joe kii aavedan-star code kii jimmedaari haye) lekin kewal yeh kii koee bhee prograaming truti kissy bhee paribhaashit databases baadhaon kaa ullanghan naheen curr sakati haye.
nirantarta koo ack safal lekhan, adyatan yaa record key hataane key baad bhee samajha jaa sakata haye, kissy bhee padhane key anurodh koo turant record kaa navintam moolya praapt hotaa haye.
acid guaranti key roop mein.
aml lenden koo paribhaashit karane vaali chaar guaranti mein seey ack sthirata haye; haalaanki, iss guaranti kii prakriti key baare mein mahatvapurna aspashtata maujood haye. ise vibhinn roop seey paribhaashit kiya gayaa haih
choonki yeye vibhinn paribhaashaaen parasparik roop seey ananya naheen hain, isaliye ack aisee pranali koo design karna sambhav haye joe shabd key harr arth mein "sthirata" kii guaranti detee haye, jaisa kii aaj aam upayog mein adhikansh sambandhparak databases prabandhan pranaaliyan yakinan karati hain.
ack cap vyaapaar key roop mein.
cap pramey teen trade-off parr adharit haye, jinamen seey ack "paramanu sthirata" haye (sankshipt roop seey "sthirata" key liye sankshipt), jisake baare mein lekhakon ney nott kiya haye, "paramanu sthirata parr charcha karna ack acid databases key baare mein baat karane seey kuchh alag haye, kyonki databases sthirata lenden koo sandarbhit karati haye, jabaki paramanu sthirata kewal ack anurodh/pratikriya sanchaalan anukram key guna koo sandarbhit karati haye. aur iska arth aml mein paramanu seey alag haye, kyonki yeh paramanu aur susangat donon key databases dhaaranaon koo samaahit kartaa haye."cap pramey mein, aapke paas nimnalikhit teen gunon mein seey kewal dou hoe sakate hainh sthirata, upalabdhata, yaa vibhajan sahishnuta. isaliye, kuchh databases pranaliyon mein nirantarta kaa vyaapaar karna parh sakata haye.

