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isucon9-qualify's Issues

/users/transaction.json is too slow 

TOP 37 Slow Requests
 1  6.980  GET /users/transactions.json HTTP/1.1
 2  6.842  POST /initialize HTTP/1.1
 3  5.664  GET /users/transactions.json HTTP/1.1
 4  5.635  GET /users/transactions.json HTTP/1.1
 5  5.609  GET /users/transactions.json HTTP/1.1
 6  5.407  GET /users/transactions.json HTTP/1.1
 7  5.349  GET /users/transactions.json HTTP/1.1
 8  5.348  GET /users/transactions.json HTTP/1.1
 9  5.307  GET /users/transactions.json HTTP/1.1
10  5.247  GET /users/transactions.json HTTP/1.1
11  5.237  GET /users/transactions.json HTTP/1.1
12  5.207  GET /users/transactions.json HTTP/1.1
13  5.192  GET /users/transactions.json HTTP/1.1
14  5.027  GET /users/transactions.json HTTP/1.1
15  5.026  GET /users/transactions.json HTTP/1.1
16  4.825  GET /users/transactions.json HTTP/1.1
17  4.804  GET /users/transactions.json HTTP/1.1
18  4.672  GET /users/transactions.json HTTP/1.1

IN (?, ?, ?, ...

isucon9-qualify/isucari/webapp/ruby/lib/isucari/web.rb

Line 284 in 61967d7

db.xquery("SELECT * FROM `items` WHERE (`seller_id` = ? OR `buyer_id` = ?) AND `status` IN (?, ?, ?, ?, ?) AND (`created_at` < ? OR (`created_at` <= ? AND `id` < ?)) ORDER BY `created_at` DESC, `id` DESC LIMIT #{TRANSACTIONS_PER_PAGE + 1}", user['id'], user['id'], ITEM_STATUS_ON_SALE, ITEM_STATUS_TRADING, ITEM_STATUS_SOLD_OUT, ITEM_STATUS_CANCEL, ITEM_STATUS_STOP, Time.at(created_at), Time.at(created_at), item_id)

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