var mergeServername = ['x1_bt_game_20178', 'x1_bt_game_20179', 'x1_bt_game_20180', 'x1_bt_game_20181', 'x1_bt_game_20182', 'x1_bt_game_20183', 'x1_bt_game_20184', 'x1_bt_game_20185']; var targetServer = 'x1_bt_game_20236'; var sumUserCount = 0; var sumGuildCount = 0; for (let i = 0; i < mergeServername.length; i++) { var serverName = mergeServername[i]; db = db.getSiblingDB(serverName); var userCount = db.user.find().count(); var guildCount = db.guildInfo.find().count(); sumUserCount += userCount; sumGuildCount += guildCount; } db = db.getSiblingDB(targetServer); var mergeUserCount = db.user.find().count(); var mergeGuildCount = db.guildInfo.find().count(); print(sumUserCount, mergeUserCount, sumGuildCount, mergeGuildCount);