Big Data an der ETHZ - ETH Zurich | Karteikarten & Zusammenfassungen

Lernmaterialien für Big Data an der ETHZ - ETH Zurich

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What are Append blobs?

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Append blobs are comprised of blocks and are optimized for append operations. Blocks are added to the end of the blob only. Updating or deleting of existing blocks is not supported.

The maximum size of an append blob is slightly more than 195 GB

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What can the values of a document in a document store be?

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They can be Strings, integers, other documents, arrays and arrays of documents. Not all documents need to have the same fields.

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What is the 3rd Normal Form?

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Additionally to the 2nd normal form we also want no transitive dependency. So if dependency is A <- B <- C then A and C should not be in the same table and the table should be split up into (A, B) and (B, C)

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How big can block blobs be in Azure?

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almost 5TB

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DRAM Read/Write Speed

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50 GB/s

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What are Append blobs? Max size?

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Append blobs are comprised of blocks and are optimized for append operations.

Updating or deleting of existing blocks is not supported.

The maximum size of an append blob is slightly more than 195 GB

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SSD Read/Write Speed

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3.3 GB/s

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HDD Read/Write Speed

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0.25 GB/s

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What are Page blobs? Maximum size?

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Page blobs are a collection of 512-byte pages optimized for random read and write operations.

The maximum size for a page blob is 8 TB.

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Which statements about HDFS are true?

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The locations of block replicas are part of the persistent checkpoint that the NameNode stores in its native file system.

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What are block blobs? Max size?

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Block blobs let you upload large blobs efficiently. Block blobs are comprised of blocks. The maximum size of a block blob is about 5 TB.

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What are merkle trees?

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A Merkle tree is a binary tree of hashes in which every leaf node gets as its label a data block and every non-leaf node is labelled with the cryptographic hash of the labels of its child nodes.

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Q:

What are Append blobs?

A:

Append blobs are comprised of blocks and are optimized for append operations. Blocks are added to the end of the blob only. Updating or deleting of existing blocks is not supported.

The maximum size of an append blob is slightly more than 195 GB

Q:

What can the values of a document in a document store be?

A:

They can be Strings, integers, other documents, arrays and arrays of documents. Not all documents need to have the same fields.

Q:

What is the 3rd Normal Form?

A:

Additionally to the 2nd normal form we also want no transitive dependency. So if dependency is A <- B <- C then A and C should not be in the same table and the table should be split up into (A, B) and (B, C)

Q:

How big can block blobs be in Azure?

A:

almost 5TB

Q:

DRAM Read/Write Speed

A:

50 GB/s

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Q:

What are Append blobs? Max size?

A:

Append blobs are comprised of blocks and are optimized for append operations.

Updating or deleting of existing blocks is not supported.

The maximum size of an append blob is slightly more than 195 GB

Q:

SSD Read/Write Speed

A:

3.3 GB/s

Q:

HDD Read/Write Speed

A:

0.25 GB/s

Q:

What are Page blobs? Maximum size?

A:

Page blobs are a collection of 512-byte pages optimized for random read and write operations.

The maximum size for a page blob is 8 TB.

Q:

Which statements about HDFS are true?

A:

The locations of block replicas are part of the persistent checkpoint that the NameNode stores in its native file system.

Q:

What are block blobs? Max size?

A:

Block blobs let you upload large blobs efficiently. Block blobs are comprised of blocks. The maximum size of a block blob is about 5 TB.

Q:

What are merkle trees?

A:

A Merkle tree is a binary tree of hashes in which every leaf node gets as its label a data block and every non-leaf node is labelled with the cryptographic hash of the labels of its child nodes.

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