{"id":476602,"date":"2023-08-09T07:31:20","date_gmt":"2023-08-09T07:31:20","guid":{"rendered":""},"modified":"2023-09-05T11:13:03","modified_gmt":"2023-09-05T11:13:03","slug":"data-availability","status":"publish","type":"wiki","link":"https:\/\/oneproxy.pro\/vn\/wiki\/data-availability\/","title":{"rendered":"T\u00ednh kh\u1ea3 d\u1ee5ng c\u1ee7a d\u1eef li\u1ec7u"},"content":{"rendered":"<p>T\u00ednh kh\u1ea3 d\u1ee5ng c\u1ee7a d\u1eef li\u1ec7u \u0111\u1ec1 c\u1eadp \u0111\u1ebfn m\u1ee9c \u0111\u1ed9 d\u1eef li\u1ec7u c\u00f3 th\u1ec3 truy c\u1eadp v\u00e0 s\u1eb5n s\u00e0ng \u0111\u1ec3 s\u1eed d\u1ee5ng, b\u1ea5t k\u1ec3 v\u1ecb tr\u00ed th\u1ef1c t\u1ebf c\u1ee7a d\u1eef li\u1ec7u. Kh\u00e1i ni\u1ec7m n\u00e0y l\u00e0 m\u1ed9t kh\u00eda c\u1ea1nh quan tr\u1ecdng c\u1ee7a h\u1ec7 th\u1ed1ng qu\u1ea3n l\u00fd th\u00f4ng tin, qu\u1ea3n l\u00fd c\u01a1 s\u1edf d\u1eef li\u1ec7u v\u00e0 gi\u1ea3i ph\u00e1p l\u01b0u tr\u1eef \u0111\u00e1m m\u00e2y.<\/p>\n<h2>S\u1ef1 xu\u1ea5t hi\u1ec7n v\u00e0 ph\u00e1t tri\u1ec3n c\u1ee7a t\u00ednh s\u1eb5n c\u00f3 c\u1ee7a d\u1eef li\u1ec7u<\/h2>\n<p>Kh\u00e1i ni\u1ec7m v\u1ec1 t\u00ednh s\u1eb5n c\u00f3 c\u1ee7a d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c ch\u00fa \u00fd v\u1edbi s\u1ef1 ra \u0111\u1eddi c\u1ee7a h\u1ec7 th\u1ed1ng m\u00e1y t\u00ednh v\u00e0 nhu c\u1ea7u qu\u1ea3n l\u00fd th\u00f4ng tin k\u1ef9 thu\u1eadt s\u1ed1. Tr\u01b0\u1edbc k\u1ef7 nguy\u00ean m\u00e1y t\u00ednh, d\u1eef li\u1ec7u ch\u1ee7 y\u1ebfu \u0111\u01b0\u1ee3c l\u01b0u tr\u1eef v\u00e0 qu\u1ea3n l\u00fd th\u1ee7 c\u00f4ng, d\u1eabn \u0111\u1ebfn kh\u00f3 kh\u0103n trong vi\u1ec7c \u0111\u1ea3m b\u1ea3o t\u00ednh s\u1eb5n c\u00f3 c\u1ee7a n\u00f3.<\/p>\n<p>Vi\u1ec7c \u0111\u1ec1 c\u1eadp \u0111\u1ebfn t\u00ednh s\u1eb5n c\u00f3 c\u1ee7a d\u1eef li\u1ec7u l\u1ea7n \u0111\u1ea7u ti\u00ean c\u00f3 th\u1ec3 b\u1eaft ngu\u1ed3n t\u1eeb \u0111\u1ea7u nh\u1eefng n\u0103m 1960 v\u1edbi s\u1ef1 ph\u00e1t tri\u1ec3n c\u1ee7a h\u1ec7 th\u1ed1ng qu\u1ea3n l\u00fd c\u01a1 s\u1edf d\u1eef li\u1ec7u (DBMS). Khi c\u00e1c doanh nghi\u1ec7p b\u1eaft \u0111\u1ea7u d\u1ef1a nhi\u1ec1u h\u01a1n v\u00e0o nh\u1eefng hi\u1ec3u bi\u1ebft d\u1ef1a tr\u00ean d\u1eef li\u1ec7u, nhu c\u1ea7u v\u1ec1 d\u1eef li\u1ec7u s\u1eb5n c\u00f3 tr\u1edf n\u00ean n\u1ed5i b\u1eadt h\u01a1n. Trong nh\u1eefng n\u0103m qua, v\u1edbi s\u1ef1 ph\u00e1t tri\u1ec3n c\u1ee7a c\u00f4ng ngh\u1ec7 v\u00e0 kh\u1ed1i l\u01b0\u1ee3ng d\u1eef li\u1ec7u t\u0103ng theo c\u1ea5p s\u1ed1 nh\u00e2n, t\u00ednh s\u1eb5n c\u00f3 c\u1ee7a d\u1eef li\u1ec7u \u0111\u00e3 tr\u1edf th\u00e0nh m\u1ed9t kh\u00eda c\u1ea1nh quan tr\u1ecdng c\u1ee7a qu\u1ea3n l\u00fd d\u1eef li\u1ec7u.<\/p>\n<h2>S\u1ef1 ph\u1ee9c t\u1ea1p c\u1ee7a t\u00ednh s\u1eb5n c\u00f3 c\u1ee7a d\u1eef li\u1ec7u<\/h2>\n<p>T\u00ednh s\u1eb5n c\u00f3 c\u1ee7a d\u1eef li\u1ec7u kh\u00f4ng ch\u1ec9 \u0111\u01a1n thu\u1ea7n l\u00e0 c\u00f3 th\u1ec3 truy c\u1eadp \u0111\u01b0\u1ee3c d\u1eef li\u1ec7u. N\u00f3 \u0111\u00f2i h\u1ecfi nhi\u1ec1u th\u00e0nh ph\u1ea7n kh\u00e1c nhau, bao g\u1ed3m t\u00ednh to\u00e0n v\u1eb9n d\u1eef li\u1ec7u, b\u1ea3o m\u1eadt d\u1eef li\u1ec7u v\u00e0 kh\u1eafc ph\u1ee5c th\u1ea3m h\u1ecda. Nh\u1eefng kh\u00eda c\u1ea1nh n\u00e0y \u0111\u1ea3m b\u1ea3o r\u1eb1ng d\u1eef li\u1ec7u kh\u00f4ng ch\u1ec9 c\u00f3 th\u1ec3 truy c\u1eadp \u0111\u01b0\u1ee3c khi c\u1ea7n m\u00e0 c\u00f2n ch\u00ednh x\u00e1c, an to\u00e0n v\u00e0 c\u00f3 th\u1ec3 ph\u1ee5c h\u1ed3i trong tr\u01b0\u1eddng h\u1ee3p b\u1ecb m\u1ea5t.<\/p>\n<p>T\u00ednh s\u1eb5n c\u00f3 c\u1ee7a d\u1eef li\u1ec7u b\u1ecb \u1ea3nh h\u01b0\u1edfng b\u1edfi m\u1ed9t s\u1ed1 y\u1ebfu t\u1ed1:<\/p>\n<ol>\n<li><strong>Th\u1eddi gian ho\u1ea1t \u0111\u1ed9ng h\u1ec7 th\u1ed1ng<\/strong>: \u0110i\u1ec1u n\u00e0y \u0111\u1ec1 c\u1eadp \u0111\u1ebfn l\u01b0\u1ee3ng th\u1eddi gian h\u1ec7 th\u1ed1ng ho\u1ea1t \u0111\u1ed9ng v\u00e0 c\u00f3 th\u1ec3 truy c\u1eadp \u0111\u01b0\u1ee3c. Th\u1eddi gian ho\u1ea1t \u0111\u1ed9ng c\u1ee7a h\u1ec7 th\u1ed1ng cao l\u00e0 r\u1ea5t quan tr\u1ecdng \u0111\u1ed1i v\u1edbi t\u00ednh kh\u1ea3 d\u1ee5ng c\u1ee7a d\u1eef li\u1ec7u.<\/li>\n<li><strong>D\u1eef li\u1ec7u d\u1ef1 ph\u00f2ng<\/strong>: \u0110i\u1ec1u n\u00e0y li\u00ean quan \u0111\u1ebfn vi\u1ec7c t\u1ea1o c\u00e1c b\u1ea3n sao d\u1eef li\u1ec7u \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o t\u00ednh kh\u1ea3 d\u1ee5ng c\u1ee7a n\u00f3 trong tr\u01b0\u1eddng h\u1ee3p h\u1ec7 th\u1ed1ng b\u1ecb l\u1ed7i.<\/li>\n<li><strong>Th\u1ee7 t\u1ee5c sao l\u01b0u<\/strong>: Sao l\u01b0u th\u01b0\u1eddng xuy\u00ean b\u1ea3o v\u1ec7 kh\u1ecfi m\u1ea5t d\u1eef li\u1ec7u, t\u1eeb \u0111\u00f3 n\u00e2ng cao t\u00ednh kh\u1ea3 d\u1ee5ng c\u1ee7a d\u1eef li\u1ec7u.<\/li>\n<li><strong>L\u1eadp k\u1ebf ho\u1ea1ch kh\u1eafc ph\u1ee5c th\u1ea3m h\u1ecda<\/strong>: Trong tr\u01b0\u1eddng h\u1ee3p m\u1ea5t d\u1eef li\u1ec7u do c\u00e1c tr\u01b0\u1eddng h\u1ee3p kh\u00f4ng l\u01b0\u1eddng tr\u01b0\u1edbc \u0111\u01b0\u1ee3c, vi\u1ec7c c\u00f3 k\u1ebf ho\u1ea1ch kh\u1eafc ph\u1ee5c th\u1ea3m h\u1ecda m\u1ea1nh m\u1ebd s\u1ebd \u0111\u1ea3m b\u1ea3o t\u00ednh kh\u1ea3 d\u1ee5ng c\u1ee7a d\u1eef li\u1ec7u.<\/li>\n<li><strong>Ph\u00e2n ph\u1ed1i d\u1eef li\u1ec7u<\/strong>: Ph\u00e2n ph\u1ed1i d\u1eef li\u1ec7u tr\u00ean nhi\u1ec1u \u0111\u1ecba \u0111i\u1ec3m kh\u00e1c nhau c\u00f3 th\u1ec3 t\u0103ng c\u01b0\u1eddng t\u00ednh kh\u1ea3 d\u1ee5ng c\u1ee7a d\u1eef li\u1ec7u b\u1eb1ng c\u00e1ch gi\u1ea3m s\u1ef1 ph\u1ee5 thu\u1ed9c v\u00e0o m\u1ed9t \u0111i\u1ec3m truy c\u1eadp duy nh\u1ea5t.<\/li>\n<\/ol>\n<h2>T\u00ednh kh\u1ea3 d\u1ee5ng c\u1ee7a d\u1eef li\u1ec7u ho\u1ea1t \u0111\u1ed9ng nh\u01b0 th\u1ebf n\u00e0o<\/h2>\n<p>T\u00ednh kh\u1ea3 d\u1ee5ng c\u1ee7a d\u1eef li\u1ec7u ph\u1ee5 thu\u1ed9c v\u00e0o ki\u1ebfn tr\u00fac c\u1ee7a h\u1ec7 th\u1ed1ng v\u00e0 c\u00e1c chi\u1ebfn l\u01b0\u1ee3c \u0111\u01b0\u1ee3c tri\u1ec3n khai \u0111\u1ec3 qu\u1ea3n l\u00fd d\u1eef li\u1ec7u. V\u00ed d\u1ee5: trong h\u1ec7 th\u1ed1ng d\u1ef1a tr\u00ean \u0111\u00e1m m\u00e2y, d\u1eef li\u1ec7u th\u01b0\u1eddng \u0111\u01b0\u1ee3c ph\u00e2n ph\u1ed1i tr\u00ean nhi\u1ec1u m\u00e1y ch\u1ee7 \u1edf c\u00e1c v\u1ecb tr\u00ed kh\u00e1c nhau. B\u1eb1ng c\u00e1ch n\u00e0y, ngay c\u1ea3 khi m\u1ed9t m\u00e1y ch\u1ee7 b\u1ecb l\u1ed7i, d\u1eef li\u1ec7u v\u1eabn c\u00f3 s\u1eb5n t\u1eeb c\u00e1c m\u00e1y ch\u1ee7 kh\u00e1c.<\/p>\n<p>D\u1ef1 ph\u00f2ng d\u1eef li\u1ec7u v\u00e0 sao l\u01b0u th\u01b0\u1eddng xuy\u00ean l\u00e0 nh\u1eefng ph\u01b0\u01a1ng ph\u00e1p ph\u1ed5 bi\u1ebfn \u0111\u1ec3 c\u1ea3i thi\u1ec7n t\u00ednh kh\u1ea3 d\u1ee5ng c\u1ee7a d\u1eef li\u1ec7u. V\u1edbi t\u00ednh n\u0103ng d\u1ef1 ph\u00f2ng d\u1eef li\u1ec7u, nhi\u1ec1u b\u1ea3n sao d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c l\u01b0u tr\u1eef \u1edf c\u00e1c v\u1ecb tr\u00ed kh\u00e1c nhau. Trong tr\u01b0\u1eddng h\u1ee3p h\u1ec7 th\u1ed1ng b\u1ecb l\u1ed7i, d\u1eef li\u1ec7u v\u1eabn c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c truy c\u1eadp t\u1eeb c\u00e1c v\u1ecb tr\u00ed kh\u00e1c nhau n\u00e0y. M\u1eb7t kh\u00e1c, vi\u1ec7c sao l\u01b0u th\u01b0\u1eddng xuy\u00ean \u0111\u1ea3m b\u1ea3o r\u1eb1ng b\u1ea3n sao d\u1eef li\u1ec7u c\u1eadp nh\u1eadt lu\u00f4n c\u00f3 s\u1eb5n \u0111\u1ec3 ph\u1ee5c h\u1ed3i khi c\u1ea7n.<\/p>\n<h2>C\u00e1c t\u00ednh n\u0103ng ch\u00ednh c\u1ee7a t\u00ednh s\u1eb5n c\u00f3 c\u1ee7a d\u1eef li\u1ec7u<\/h2>\n<p>C\u00e1c t\u00ednh n\u0103ng ch\u00ednh c\u1ee7a t\u00ednh s\u1eb5n c\u00f3 c\u1ee7a d\u1eef li\u1ec7u bao g\u1ed3m:<\/p>\n<ol>\n<li><strong>\u0111\u1ed9 tin c\u1eady<\/strong>: H\u1ec7 th\u1ed1ng \u0111\u00e1ng tin c\u1eady \u0111\u1ea3m b\u1ea3o r\u1eb1ng d\u1eef li\u1ec7u c\u00f3 s\u1eb5n b\u1ea5t c\u1ee9 khi n\u00e0o c\u1ea7n thi\u1ebft.<\/li>\n<li><strong>\u0110\u1ed9 b\u1ec1n<\/strong>: M\u1ed9t h\u1ec7 th\u1ed1ng m\u1ea1nh m\u1ebd c\u00f3 th\u1ec3 ch\u1ecbu \u0111\u01b0\u1ee3c c\u00e1c l\u1ed7i m\u00e0 kh\u00f4ng \u1ea3nh h\u01b0\u1edfng \u0111\u00e1ng k\u1ec3 \u0111\u1ebfn t\u00ednh s\u1eb5n c\u00f3 c\u1ee7a d\u1eef li\u1ec7u.<\/li>\n<li><strong>kh\u1ea3 n\u0103ng ph\u1ee5c h\u1ed3i<\/strong>: C\u00e1c h\u1ec7 th\u1ed1ng c\u00f3 kh\u1ea3 n\u0103ng ph\u1ee5c h\u1ed3i nhanh ch\u00f3ng c\u00f3 th\u1ec3 ph\u1ee5c h\u1ed3i nhanh ch\u00f3ng sau m\u1ecdi s\u1ef1 c\u1ed1, t\u1eeb \u0111\u00f3 gi\u1ea3m thi\u1ec3u th\u1eddi gian ng\u1eebng ho\u1ea1t \u0111\u1ed9ng v\u00e0 duy tr\u00ec t\u00ednh kh\u1ea3 d\u1ee5ng c\u1ee7a d\u1eef li\u1ec7u.<\/li>\n<li><strong>B\u1ea3o v\u1ec7<\/strong>: T\u00ednh kh\u1ea3 d\u1ee5ng c\u1ee7a d\u1eef li\u1ec7u c\u0169ng bao g\u1ed3m vi\u1ec7c \u0111\u1ea3m b\u1ea3o r\u1eb1ng d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c an to\u00e0n v\u00e0 ch\u1ec9 nh\u1eefng c\u00e1 nh\u00e2n \u0111\u01b0\u1ee3c \u1ee7y quy\u1ec1n m\u1edbi c\u00f3 th\u1ec3 truy c\u1eadp \u0111\u01b0\u1ee3c.<\/li>\n<\/ol>\n<h2>C\u00e1c lo\u1ea1i d\u1eef li\u1ec7u s\u1eb5n c\u00f3<\/h2>\n<p>Ch\u1ee7 y\u1ebfu c\u00f3 ba lo\u1ea1i t\u00ednh kh\u1ea3 d\u1ee5ng c\u1ee7a d\u1eef li\u1ec7u, th\u01b0\u1eddng \u0111\u01b0\u1ee3c bi\u1ec3u th\u1ecb d\u01b0\u1edbi d\u1ea1ng ph\u1ea7n tr\u0103m. Ch\u00fang bao g\u1ed3m:<\/p>\n<table>\n<thead>\n<tr>\n<th>Lo\u1ea1i s\u1eb5n c\u00f3 c\u1ee7a d\u1eef li\u1ec7u<\/th>\n<th>T\u1ef7 l\u1ec7 ph\u1ea7n tr\u0103m<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>T\u00ednh s\u1eb5n s\u00e0ng cao<\/td>\n<td>99-99.99%<\/td>\n<\/tr>\n<tr>\n<td>S\u1eb5n c\u00f3 li\u00ean t\u1ee5c<\/td>\n<td>99.999%<\/td>\n<\/tr>\n<tr>\n<td>Lu\u00f4n s\u1eb5n s\u00e0ng<\/td>\n<td>100%<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>T\u00ednh s\u1eb5n s\u00e0ng cao li\u00ean quan \u0111\u1ebfn c\u00e1c h\u1ec7 th\u1ed1ng \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf m\u1ea1nh m\u1ebd v\u00e0 linh ho\u1ea1t, gi\u1ea3m thi\u1ec3u th\u1eddi gian ng\u1eebng ho\u1ea1t \u0111\u1ed9ng. T\u00ednh s\u1eb5n s\u00e0ng li\u00ean t\u1ee5c \u0111\u01b0a \u0111i\u1ec1u n\u00e0y ti\u1ebfn th\u00eam m\u1ed9t b\u01b0\u1edbc n\u1eefa, h\u01b0\u1edbng t\u1edbi m\u1ee5c ti\u00eau g\u1ea7n nh\u01b0 kh\u00f4ng c\u00f3 th\u1eddi gian ng\u1eebng ho\u1ea1t \u0111\u1ed9ng. T\u00ednh kh\u1ea3 d\u1ee5ng lu\u00f4n b\u1eadt c\u1ed1 g\u1eafng \u0111\u1ea1t \u0111\u01b0\u1ee3c th\u1eddi gian ho\u1ea1t \u0111\u1ed9ng 100%, m\u1eb7c d\u00f9 tr\u00ean th\u1ef1c t\u1ebf, \u0111i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 kh\u00f3 \u0111\u1ea1t \u0111\u01b0\u1ee3c do c\u00e1c y\u1ebfu t\u1ed1 nh\u01b0 b\u1ea3o tr\u00ec c\u1ea7n thi\u1ebft.<\/p>\n<h2>Vi\u1ec7c s\u1eed d\u1ee5ng v\u00e0 th\u00e1ch th\u1ee9c v\u1ec1 t\u00ednh s\u1eb5n c\u00f3 c\u1ee7a d\u1eef li\u1ec7u<\/h2>\n<p>T\u00ednh kh\u1ea3 d\u1ee5ng c\u1ee7a d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng tr\u00ean nhi\u1ec1u l\u0129nh v\u1ef1c kh\u00e1c nhau, bao g\u1ed3m t\u00e0i ch\u00ednh, ch\u0103m s\u00f3c s\u1ee9c kh\u1ecfe, c\u00f4ng ngh\u1ec7 v\u00e0 th\u01b0\u01a1ng m\u1ea1i \u0111i\u1ec7n t\u1eed, c\u00f9ng m\u1ed9t s\u1ed1 l\u0129nh v\u1ef1c kh\u00e1c. Tuy nhi\u00ean, vi\u1ec7c \u0111\u1ea3m b\u1ea3o t\u00ednh s\u1eb5n c\u00f3 c\u1ee7a d\u1eef li\u1ec7u kh\u00f4ng ph\u1ea3i l\u00e0 kh\u00f4ng c\u00f3 th\u00e1ch th\u1ee9c. Ch\u00fang c\u00f3 th\u1ec3 bao g\u1ed3m:<\/p>\n<ul>\n<li><strong>L\u1ed7i ph\u1ea7n c\u1ee9ng ho\u1eb7c ph\u1ea7n m\u1ec1m<\/strong><\/li>\n<li><strong>C\u00e1c m\u1ed1i \u0111e d\u1ecda an ninh m\u1ea1ng<\/strong><\/li>\n<li><strong>L\u1ed7i c\u1ee7a con ng\u01b0\u1eddi<\/strong><\/li>\n<li><strong>Th\u1ea3m h\u1ecda thi\u00ean nhi\u00ean<\/strong><\/li>\n<\/ul>\n<p>\u0110\u1ec3 v\u01b0\u1ee3t qua nh\u1eefng th\u00e1ch th\u1ee9c n\u00e0y, c\u00e1c t\u1ed5 ch\u1ee9c th\u1ef1c hi\u1ec7n m\u1ed9t s\u1ed1 chi\u1ebfn l\u01b0\u1ee3c, bao g\u1ed3m:<\/p>\n<ul>\n<li><strong>H\u1ec7 th\u1ed1ng d\u1ef1 ph\u00f2ng<\/strong><\/li>\n<li><strong>Sao l\u01b0u th\u01b0\u1eddng xuy\u00ean<\/strong><\/li>\n<li><strong>Th\u1ef1c h\u00e0nh x\u1eed l\u00fd d\u1eef li\u1ec7u an to\u00e0n<\/strong><\/li>\n<li><strong>K\u1ebf ho\u1ea1ch kh\u1eafc ph\u1ee5c th\u1ea3m h\u1ecda<\/strong><\/li>\n<\/ul>\n<h2>T\u00ednh s\u1eb5n c\u00f3 c\u1ee7a d\u1eef li\u1ec7u: So s\u00e1nh v\u00e0 \u0111\u1eb7c \u0111i\u1ec3m<\/h2>\n<p>Khi so s\u00e1nh v\u1edbi c\u00e1c thu\u1eadt ng\u1eef li\u00ean quan kh\u00e1c, t\u00ednh s\u1eb5n c\u00f3 c\u1ee7a d\u1eef li\u1ec7u n\u1ed5i b\u1eadt nh\u01b0 m\u1ed9t kh\u00e1i ni\u1ec7m ri\u00eang bi\u1ec7t.<\/p>\n<table>\n<thead>\n<tr>\n<th>\u00dd t\u01b0\u1edfng<\/th>\n<th>S\u1ef1 mi\u00eau t\u1ea3<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>T\u00ednh s\u1eb5n c\u00f3 c\u1ee7a d\u1eef li\u1ec7u<\/td>\n<td>\u0110\u1ec1 c\u1eadp \u0111\u1ebfn d\u1eef li\u1ec7u c\u00f3 th\u1ec3 truy c\u1eadp v\u00e0 s\u1eb5n s\u00e0ng \u0111\u1ec3 s\u1eed d\u1ee5ng<\/td>\n<\/tr>\n<tr>\n<td>To\u00e0n v\u1eb9n d\u1eef li\u1ec7u<\/td>\n<td>\u0110\u1ea3m b\u1ea3o d\u1eef li\u1ec7u ch\u00ednh x\u00e1c v\u00e0 kh\u00f4ng thay \u0111\u1ed5i trong qu\u00e1 tr\u00ecnh v\u1eadn chuy\u1ec3n<\/td>\n<\/tr>\n<tr>\n<td>B\u1ea3o m\u1eadt d\u1eef li\u1ec7u<\/td>\n<td>B\u1ea3o v\u1ec7 d\u1eef li\u1ec7u kh\u1ecfi b\u1ecb truy c\u1eadp tr\u00e1i ph\u00e9p v\u00e0 vi ph\u1ea1m<\/td>\n<\/tr>\n<tr>\n<td>\u0110\u1ed9 b\u1ec1n d\u1eef li\u1ec7u<\/td>\n<td>\u0110\u1ea3m b\u1ea3o d\u1eef li\u1ec7u kh\u00f4ng b\u1ecb m\u1ea5t khi l\u01b0u v\u00e0o h\u1ec7 th\u1ed1ng<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Quan \u0111i\u1ec3m t\u01b0\u01a1ng lai v\u1ec1 t\u00ednh s\u1eb5n c\u00f3 c\u1ee7a d\u1eef li\u1ec7u<\/h2>\n<p>Khi d\u1eef li\u1ec7u ti\u1ebfp t\u1ee5c tr\u1edf n\u00ean kh\u00f4ng th\u1ec3 thi\u1ebfu trong cu\u1ed9c s\u1ed1ng s\u1ed1 c\u1ee7a ch\u00fang ta, vi\u1ec7c \u0111\u1ea3m b\u1ea3o t\u00ednh s\u1eb5n c\u00f3 c\u1ee7a d\u1eef li\u1ec7u s\u1ebd ti\u1ebfp t\u1ee5c l\u00e0 \u01b0u ti\u00ean h\u00e0ng \u0111\u1ea7u. T\u01b0\u01a1ng lai c\u1ee7a t\u00ednh s\u1eb5n c\u00f3 c\u1ee7a d\u1eef li\u1ec7u c\u00f3 th\u1ec3 s\u1ebd ch\u1ee9ng ki\u1ebfn s\u1ef1 ph\u00e1t tri\u1ec3n c\u1ee7a c\u00e1c c\u00f4ng ngh\u1ec7 v\u00e0 chi\u1ebfn l\u01b0\u1ee3c ti\u00ean ti\u1ebfn h\u01a1n \u0111\u1ec3 duy tr\u00ec th\u1eddi gian ho\u1ea1t \u0111\u1ed9ng, b\u1ea3o m\u1eadt d\u1eef li\u1ec7u v\u00e0 \u0111\u1ea3m b\u1ea3o ph\u1ee5c h\u1ed3i nhanh ch\u00f3ng trong tr\u01b0\u1eddng h\u1ee3p m\u1ea5t d\u1eef li\u1ec7u.<\/p>\n<p>Tr\u00ed tu\u1ec7 nh\u00e2n t\u1ea1o v\u00e0 h\u1ecdc m\u00e1y c\u00f3 th\u1ec3 \u0111\u00f3ng vai tr\u00f2 quan tr\u1ecdng trong vi\u1ec7c qu\u1ea3n l\u00fd t\u00ednh kh\u1ea3 d\u1ee5ng c\u1ee7a d\u1eef li\u1ec7u b\u1eb1ng c\u00e1ch d\u1ef1 \u0111o\u00e1n v\u00e0 gi\u1ea3m thi\u1ec3u r\u1ee7i ro ti\u1ec1m \u1ea9n. Ngo\u00e0i ra, c\u00f4ng ngh\u1ec7 chu\u1ed7i kh\u1ed1i c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 t\u1ea1o c\u01a1 s\u1edf d\u1eef li\u1ec7u phi t\u1eadp trung nh\u1eb1m t\u0103ng t\u00ednh kh\u1ea3 d\u1ee5ng v\u00e0 b\u1ea3o m\u1eadt d\u1eef li\u1ec7u.<\/p>\n<h2>M\u00e1y ch\u1ee7 proxy v\u00e0 t\u00ednh s\u1eb5n c\u00f3 c\u1ee7a d\u1eef li\u1ec7u<\/h2>\n<p>M\u00e1y ch\u1ee7 proxy c\u00f3 th\u1ec3 c\u00f3 t\u00e1c \u0111\u1ed9ng s\u00e2u s\u1eafc \u0111\u1ebfn t\u00ednh kh\u1ea3 d\u1ee5ng c\u1ee7a d\u1eef li\u1ec7u. Ch\u00fang \u0111\u00f3ng vai tr\u00f2 trung gian gi\u1eefa ng\u01b0\u1eddi d\u00f9ng v\u00e0 Internet, mang l\u1ea1i nhi\u1ec1u l\u1ee3i \u00edch kh\u00e1c nhau, ch\u1eb3ng h\u1ea1n nh\u01b0 t\u0103ng c\u01b0\u1eddng b\u1ea3o m\u1eadt, c\u1ea3i thi\u1ec7n hi\u1ec7u su\u1ea5t v\u00e0 n\u00e2ng cao quy\u1ec1n ri\u00eang t\u01b0. V\u1ec1 t\u00ednh s\u1eb5n c\u00f3 c\u1ee7a d\u1eef li\u1ec7u, m\u00e1y ch\u1ee7 proxy c\u00f3 th\u1ec3 l\u01b0u tr\u1eef d\u1eef li\u1ec7u v\u00e0o b\u1ed9 \u0111\u1ec7m v\u00e0 do \u0111\u00f3 n\u00e2ng cao kh\u1ea3 n\u0103ng truy c\u1eadp c\u1ee7a n\u00f3.<\/p>\n<p>V\u00ed d\u1ee5: n\u1ebfu m\u00e1y ch\u1ee7 c\u1ee7a t\u1ed5 ch\u1ee9c kh\u00f4ng ho\u1ea1t \u0111\u1ed9ng, ng\u01b0\u1eddi d\u00f9ng v\u1eabn c\u00f3 th\u1ec3 truy c\u1eadp d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c l\u01b0u trong b\u1ed9 nh\u1edb \u0111\u1ec7m tr\u00ean m\u00e1y ch\u1ee7 proxy, do \u0111\u00f3 \u0111\u1ea3m b\u1ea3o t\u00ednh kh\u1ea3 d\u1ee5ng c\u1ee7a d\u1eef li\u1ec7u. H\u01a1n n\u1eefa, proxy ng\u01b0\u1ee3c c\u00f3 th\u1ec3 ph\u00e2n ph\u1ed1i t\u1ea3i m\u1ea1ng tr\u00ean nhi\u1ec1u m\u00e1y ch\u1ee7, c\u1ea3i thi\u1ec7n \u0111\u1ed9 tin c\u1eady v\u00e0 t\u00ednh kh\u1ea3 d\u1ee5ng chung c\u1ee7a h\u1ec7 th\u1ed1ng.<\/p>\n<h2>Li\u00ean k\u1ebft li\u00ean quan<\/h2>\n<p>\u0110\u1ec3 bi\u1ebft th\u00eam th\u00f4ng tin v\u1ec1 t\u00ednh kh\u1ea3 d\u1ee5ng c\u1ee7a d\u1eef li\u1ec7u, b\u1ea1n c\u00f3 th\u1ec3 tham kh\u1ea3o c\u00e1c t\u00e0i nguy\u00ean sau:<\/p>\n<ol>\n<li><a href=\"https:\/\/www.dataversity.net\/data-availability-important\/#\" target=\"_new\" rel=\"noopener nofollow\">T\u00ednh s\u1eb5n c\u00f3 c\u1ee7a d\u1eef li\u1ec7u v\u00e0 t\u1ea7m quan tr\u1ecdng c\u1ee7a n\u00f3<\/a><\/li>\n<li><a href=\"https:\/\/www.sciencedirect.com\/topics\/computer-science\/data-availability\" target=\"_new\" rel=\"noopener nofollow\">Hi\u1ec3u t\u00ednh s\u1eb5n c\u00f3 c\u1ee7a d\u1eef li\u1ec7u<\/a><\/li>\n<li><a href=\"https:\/\/www.ibm.com\/cloud\/learn\/data-availability\" target=\"_new\" rel=\"noopener nofollow\">C\u1ea3i thi\u1ec7n t\u00ednh s\u1eb5n c\u00f3 c\u1ee7a d\u1eef li\u1ec7u<\/a><\/li>\n<li><a href=\"https:\/\/oneproxy.pro\/vn\/blog\/proxy-servers-data-availability\/\" target=\"_new\" rel=\"noopener\">Vai tr\u00f2 c\u1ee7a m\u00e1y ch\u1ee7 proxy \u0111\u1ed1i v\u1edbi t\u00ednh kh\u1ea3 d\u1ee5ng c\u1ee7a d\u1eef li\u1ec7u<\/a><\/li>\n<\/ol>","protected":false},"featured_media":476603,"menu_order":0,"template":"","meta":{"_acf_changed":false,"content-type":"","inline_featured_image":false,"footnotes":""},"class_list":["post-476602","wiki","type-wiki","status-publish","has-post-thumbnail","hentry"],"acf":{"faq_title":"Frequently Asked Questions about <mark>Data Availability: A Critical Element of Information Management<\/mark>","faq_items":[{"question":"What is data availability?","answer":"<p>Data availability refers to the degree to which data is accessible and ready for use, regardless of the physical location of the data. It's a critical aspect of information management systems, database management, and cloud storage solutions.<\/p>"},{"question":"What is the history of data availability?","answer":"<p>The concept of data availability originated with the advent of computer systems and the need to manage digital information. It came into the spotlight in the early 1960s with the development of database management systems. As businesses started relying more on data-driven insights, the need for data to be readily available became more prominent.<\/p>"},{"question":"How does data availability work?","answer":"<p>Data availability relies on system architecture and the strategies implemented for data management. Key elements include system uptime, data redundancy, regular backups, disaster recovery planning, and data distribution. In a cloud-based system, for example, data is often distributed across multiple servers in different locations.<\/p>"},{"question":"What are the key features of data availability?","answer":"<p>The key features of data availability include reliability (systems ensure data is available when needed), robustness (systems can withstand failures), resiliency (systems can recover quickly from any failures), and security (data is secure and only accessible to authorized individuals).<\/p>"},{"question":"What types of data availability exist?","answer":"<p>Data availability is often categorized into High Availability (99-99.99%), Continuous Availability (99.999%), and Always-On Availability (striving for 100% but realistically challenging due to necessary maintenance).<\/p>"},{"question":"What challenges are related to data availability and how can they be overcome?","answer":"<p>Challenges to data availability can include hardware or software failures, cybersecurity threats, human error, and natural disasters. Organizations can overcome these through redundant systems, regular backups, secure data handling practices, and robust disaster recovery plans.<\/p>"},{"question":"What future technologies could impact data availability?","answer":"<p>Future technologies like artificial intelligence, machine learning, and blockchain could significantly impact data availability. These technologies could help predict and mitigate risks, thus enhancing data availability and security.<\/p>"},{"question":"How do proxy servers enhance data availability?","answer":"<p>Proxy servers act as intermediaries between users and the internet. They can cache data, enhancing its accessibility. If an organization's server is down, users can still access the data cached on the proxy server, thus ensuring data availability. Reverse proxies can also distribute the network load across multiple servers, improving the system's overall reliability and availability.<\/p>"}]},"_links":{"self":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/wiki\/476602","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/wiki"}],"about":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/types\/wiki"}],"version-history":[{"count":0,"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/wiki\/476602\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/media\/476603"}],"wp:attachment":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/media?parent=476602"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}