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26 lines
935 B
Markdown
26 lines
935 B
Markdown
# List Size Stats For All Collections
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In [Get Size Stats for a Collection](get-size-stats-for-a-collection.md), we
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saw how to use `db.collection.stats()` and its `scale` parameter to get a
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useful size metric for a given collection.
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We can combine some of this concepts with some scripting to list human-readable
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size metrics for all of our database's collections:
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```javascript
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> db.getCollectionNames().forEach(function (collectionName) {
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sizeInMb = db[collectionName].stats({ scale: 1024 * 1024 }).size;
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print(collectionName + ": " + sizeInMb + "MB");
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})
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books: 10MB
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authors: 2MB
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genres: 1MB
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```
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This snippet gets all the collections for the current database and iterates
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over them. For each collection name, it looks up the `size` stat for that
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collection scaled to megabytes and then prints it all out with some contextual
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information.
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[source](https://docs.mongodb.com/manual/faq/storage/#data-storage-diagnostics)
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