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