我就纳闷了，我就是查询一个集合内的所有记录，之前一直好好的，这两天突然用不了，官方解释说什么数据库同时并发链接数超了，我就一个用户登录，哪来的超，也邮件申请提升了，回复说什么根据需求调整，能不能有人出来解释解释

返回结果

errCode: -501004 exceed concurrent request limit | errMsg: [LimitExceeded.NoValidConnection] Connection num overrun. Please improve specifications, but if the problem cannot be solved, contact us.; 

日志

Error: errCode: -501004 exceed concurrent request limit | errMsg: [LimitExceeded.NoValidConnection] Connection num overrun. Please improve specifications, but if the problem cannot be solved, contact us.; 

    at new CloudSDKError (/var/user/node_modules/wx-server-sdk/index.js:2577:28)

    at Object.returnAsCloudSDKError (/var/user/node_modules/wx-server-sdk/index.js:2629:16)

    at Object.checkError (/var/user/node_modules/wx-server-sdk/index.js:1261:23)

    at Query.<anonymous> (/var/user/node_modules/wx-server-sdk/index.js:1325:41)

    at step (/var/user/node_modules/tslib/tslib.js:133:27)

    at Object.next (/var/user/node_modules/tslib/tslib.js:114:57)

    at fulfilled (/var/user/node_modules/tslib/tslib.js:104:62)

    at <anonymous>

    at process._tickCallback (internal/process/next_tick.js:188:7)

END RequestId: 7444f5c9-5de5-11e9-9282-525400235f2a

Report RequestId: 7444f5c9-5de5-11e9-9282-525400235f2a Duration:302.236ms Memory:256MB MaxMemoryUsed:15.0352MB