Mongdb slow query analysis, what went wrong?

{
  "op": "query",
  "ns": "fund_statistic.fund_minute_statistic_collection1588",
  "command": {
    "find": "fund_minute_statistic_collection1588",
    "filter": {
      "time": {
        "$gte": 1531868400,
        "$lt": 1531887084
      }
    },
    "$db": "fund_statistic",
    "$readPreference": {
      "mode": "primaryPreferred"
    },
    "lsid": {
      "id": UUID(
      "f0a2ea9e-f8a4-484f-86cc-d01d04ebea3e"
      )
    }
  },
  "cursorid": NumberLong(
  "119871802965176"
  ),
  "keysExamined": 101,
  "docsExamined": 101,
  "numYield": 1,
  "locks": {
    "Global": {
      "acquireCount": {
        "r": NumberLong(4)
      }
    },
    "Database": {
      "acquireCount": {
        "r": NumberLong(2)
      }
    },
    "Collection": {
      "acquireCount": {
        "r": NumberLong(2)
      }
    }
  },
  "nreturned": 101,
  "responseLength": 7185,
  "protocol": "op_msg",
  "millis": 8960,
  "planSummary": "IXSCAN { time: 1 }",
  "execStats": {
    "stage": "FETCH",
    "nReturned": 101,
    "executionTimeMillisEstimate": 119,
    "works": 101,
    "advanced": 101,
    "needTime": 0,
    "needYield": 0,
    "saveState": 2,
    "restoreState": 1,
    "isEOF": 0,
    "invalidates": 0,
    "docsExamined": 101,
    "alreadyHasObj": 0,
    "inputStage": {
      "stage": "IXSCAN",
      "nReturned": 101,
      "executionTimeMillisEstimate": 119,
      "works": 101,
      "advanced": 101,
      "needTime": 0,
      "needYield": 0,
      "saveState": 2,
      "restoreState": 1,
      "isEOF": 0,
      "invalidates": 0,
      "keyPattern": {
        "time": NumberLong(1)
      },
      "indexName": "time_1",
      "isMultiKey": false,
      "multiKeyPaths": {
        "time": []
      },
      "isUnique": false,
      "isSparse": false,
      "isPartial": false,
      "indexVersion": 2,
      "direction": "forward",
      "indexBounds": {
        "time": [
          "[1531868400, 1531887084)"
        ]
      },
      "keysExamined": 101,
      "seeks": 1,
      "dupsTested": 0,
      "dupsDropped": 0,
      "seenInvalidated": 0
    }
  },
  "ts": ISODate(
  "2018-07-18T04:11:33.487Z"
  ),
  "client": "192.168.10.81",
  "allUsers": [],
  "user": ""
}
Mongodb
Mar.28,2021

you may not have indexed the time field. Without indexing, the query is linear. It takes a long time to traverse the entries in the database.
see if db.collection.getIndexes () can get your current cache list.
if not, and this business scenario is more common, you can index the time field db.collection.createIndex ({time: 1})

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MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b3b796-2c28d.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b3b796-2c28d.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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