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CouchDB Өгөгдлийн сан
1.
CouchDB А.Тулга twitter.com/melug
2.
CouchDB (Apache) ● NoSQL
төрлийн өгөгдлийн сан ● JSON хэлбэрээр нэгдсэн индекст бүгдийг хадгалдаг ● REST интерфэйсээр дамжуулж хандана ● Өгөгдлийн санг тархаах боломжтой
3.
Өгөгдлийн ЗБ ● Өгөгдөл
нь эмх замбараагүй ● Бүх төрлийн өгөгдөл нэг жагсаалтанд хадгалагдана
4.
Map ● Өгөгдлийн санд
шинээр документ орох бүрт урьдчилан бэлтгэгдсэн View ажиллана. SQL-View төстэй. ● View-ийн үр дүн нь эрэмбэлэгдсэн тэнцвэрт модонд түлхүүр, утга хоёроор байршина. Ингэснээр тодорхой түлхүүрт зангилаа болон нэг түлхүүрээс нөгөө түлхүүр хүртэлх зангилааг хялбар олно.
5.
Map ● View нь
түлхүүр, утга хоёрыг гаргадаг. Key2 Value2 Key1 Value1 Key3 Value3 Key4 Value4 Key6 Value6 Key5 Value5 Key7 Value7
6.
Map "Pre-Order" аяллаар нэг
түлхүүрээс нөгөө түлхүүр хүртэл эрэмбэлэгдсэн дарааллыг хялбархан гаргаж ирнэ. Жнь: Он, сараар түлхүүр хийсэн бол 2010/03 гэсэн түлхүүр дээрээс 2010/05/10 хүртэл
7.
MapReduce ● Reduce function
- түлхүүрээр эрэмбэлсэн утгуудыг цөөлнө. Ө.Х бүлэглэнэ. ● Цөөлөгч функц нь ижил түлхүүртэй утгуудыг авч, нэг скаляр утга буцаана.
8.
Reduce function(values) { return values.length; } Дээрх
функц нь ижил түлхүүртэй утгуудыг аргументаараа авч тоог буцаана. Ө.Х SQL-ийн COUNT функц.
9.
MapReduce 1. "Map" буюу
өгөгдлийг шүүх явц нь олон тооны компьютерууд дээр зэрэг ажиллах боломжтой. 2. Ирсэн өгөгдлийн Merge-Sort аргаар нэгтгэж эрэмбэлэгдсэн цуглуулга үүснэ. 3. Reduce функц зөвхөн цөөлөх үйлдэл хийх учир санах ой бага хэрэглэнэ.
10.
Reduce ● Ижил түлхүүртэй
утгуудыг хоёр+ хувааж өөр компьютерууд дээр ажиллууллаад гарч ирсэн үр дүнг дахин нэгтгэх боломжтой. Энэ тохиолдолд зангилаа компьютерууд ачааллыг жигд хүлээж авна.
11.
CouchDB MapReduce Syntax Map функц: function(doc)
{ ... emit(key, value); ... } Reduce функц: function(keys, values, rereduce) { ... return ?; ... } "rereduce" нь цөөлсөн үр дүнг нэгтгэж бга эсэх.
12.
Replication local -> remote ●
Дотоод Ө.С гадагшаа хуулах local -> local ● Backup хийх remote -> remote ● Удирдлагын команд remote -> local ● Хуулж авах үйлдэл
13.
Replication filter Хоёр өгөгдлийн
санг хооронд нь хуулбарлах үед шүүлтүүр тавьж өгч болно. Ингэснээр хэрэглэгчийн локал Ө.С-д зөвхөн түүнд хамааралтай өгөгдлийг хуулбарлах боломжтой.
14.
MapReduce ● Key,Value жагсаалтыг
Value-гаар эрэмбэлж чадахгүй. ● CouchDB "join" хийдэггүй. Өгөгдлийн давхцал! id-г нь заагч болгон ашиглаж болох боловч REST API-аар дамжиж байгаа учир хэд хэдэн HTTP хүсэлт хэрэгтэй. ● CouchDB олон хэрэглэгчтэй системд хэрэглэгч бүрт Ө.С үүсгэж REPLICATION санал болгодог!
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