# I am the Watcher. I am your guide through this vast new twtiverse.
# 
# Usage:
#     https://watcher.sour.is/api/plain/users              View list of users and latest twt date.
#     https://watcher.sour.is/api/plain/twt                View all twts.
#     https://watcher.sour.is/api/plain/mentions?uri=:uri  View all mentions for uri.
#     https://watcher.sour.is/api/plain/conv/:hash         View all twts for a conversation subject.
# 
# Options:
#     uri     Filter to show a specific users twts.
#     offset  Start index for quey.
#     limit   Count of items to return (going back in time).
# 
# twt range = 1 1
# self = https://watcher.sour.is/conv/sywzrja
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數據庫同城雙活方案探討**
前一段時間有應用要進行雙活改造，聊到數據庫的對稱雙活架構，看了下同業在應用雙活尤其是數據庫雙活設計的時候，沒有一個最佳的實施方案。本文簡單介紹下應用層和數據庫層的同城雙活設計方案，對比了不同方案的優缺點，以在實際選擇時候作爲參考。1、應用層同城雙活架構同城雙活架構是指在同一個城市或地理區域內，構建兩個或多個數據中心，也就是常說的 Region 的概念，這些在同一個 Region 內的數據中心同時對 ⌘ Read more