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Amazon DocumentDB (dengan kompatibilitas MongoDB) adalah layanan basis data dokumen yang cepat, dapat diskalakan, sangat tersedia, dan terkelola penuh yang mendukung beban kerja MongoDB. Amazon DocumentDB kompatibel dengan API MongoDB 3.6 dan 4.0. Bagian ini mencantumkan fungsionalitas yang didukung. Untuk dukungan menggunakan API dan driver MongoDB, silakan berkonsultasi dengan Forum Komunitas MongoDB. Untuk dukungan menggunakan layanan Amazon DocumentDB, silakan hubungi tim dukungan AWS yang sesuai. Untuk perbedaan fungsional antara Amazon DocumentDB dan MongoDB, silakan lihat Perbedaan Fungsional: Amazon DocumentDB dan MongoDB.
Perintah dan operator MongoDB yang hanya berlaku untuk internal atau tidak berlaku untuk layanan terkelola penuh tidak didukung dan tidak termasuk dalam daftar fungsi yang didukung.
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When you create a , you can set up automatic removal of documents older than a specified number of seconds by using the
expireAfterSeconds parameter:db.createCollection( |
"weather24h", |
{ |
timeseries: { |
timeField: "timestamp", |
metaField: "metadata", |
granularity: "hours" |
}, |
expireAfterSeconds: 86400 |
} |
) |
The expiration threshold is the
{ |
"metadata": {"sensorId": 5578, "type": "temperature"}, |
"timestamp": ISODate("2021-05-18T10:00:00.000Z"), |
"temp": 12 |
} |
{ |
"metadata": {"sensorId": 5578, "type": "temperature"}, |
"timestamp": ISODate("2021-05-18T10:00:00.000Z"), |
"temp": 12 |
} |
{ |
"metadata": {"sensorId": 5578, "type": "temperature"}, |
"timestamp": ISODate("2021-05-18T10:00:00.000Z"), |
"temp": 12 |
} |
The document would expire from the database at
{ |
"metadata": {"sensorId": 5578, "type": "temperature"}, |
"timestamp": ISODate("2021-05-18T10:00:00.000Z"), |
"temp": 12 |
} |
Enable Automatic Removal on a Collection
To enable automatic removal of documents for an existing , issue the following command:
db.runCommand({ |
collMod: "weather24h", |
expireAfterSeconds: 604801 |
}) |
Change the expireAfterSeconds Parameter
To change the expireAfterSeconds parameter value, issue the following command:
db.runCommand({ |
collMod: "weather24h", |
expireAfterSeconds: 604801 |
}) |
Retrieve the Current Value of expireAfterSeconds
To retrieve the current value of expireAfterSeconds, use the command:
db.runCommand( { listCollections: 1 } ) |
The result document contains a document for the time series collection which contains the
db.runCommand({ |
collMod: "weather24h", |
expireAfterSeconds: 604801 |
}) |
{ |
cursor: { |
id: <number>, |
ns: 'test.$cmd.listCollections', |
firstBatch: [ |
{ |
name: <string>, |
type: 'timeseries', |
options: { |
expireAfterSeconds: <number>, |
timeseries: { ... } |
}, |
... |
}, |
... |
] |
} |
} |
Disable Automatic Removal
To disable automatic removal, use the command to set expireAfterSeconds to
db.runCommand({ |
collMod: "weather24h", |
expireAfterSeconds: 604801 |
}) |
db.runCommand({ |
collMod: "weather24h", |
expireAfterSeconds: "off" |
}) |
Behavior
Timing of Delete Operations
MongoDB doesn't guarantee that expired data will be deleted immediately upon expiration. Once all documents in a bucket are expired, the background task that removes expired buckets removes the bucket during the next run. The maximum span of time that a single bucket is allowed to cover is controlled by the
db.runCommand({ |
collMod: "weather24h", |
expireAfterSeconds: 604801 |
}) |
4db.runCommand({ collMod: "weather24h", expireAfterSeconds: 604801 })
Covered Time Span
6 (default)db.runCommand({ collMod: "weather24h", expireAfterSeconds: 604801 })
one hour
7db.runCommand({ collMod: "weather24h", expireAfterSeconds: 604801 })
24 hours
8db.runCommand({ collMod: "weather24h", expireAfterSeconds: 604801 })
30 days
The background task that removes expired buckets runs every 60 seconds. Therefore, documents may remain in a collection during the period between the expiration of the document, the expiration of all other documents in the bucket and the running of the background task.
Because the duration of the removal operation depends on the workload of your mongod instance, expired data may exist for some time beyond the 60 second period between runs of the background task.