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The Best of the Week (Oct. 17): SQL Zone

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The Best of the Week (Oct. 17): SQL Zone

· Java Zone ·
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Make sure you didn't miss anything with this list of the Best of the Week in the SQL Zone (October 17 - October 24). Here they are, in order of popularity:

1. MySQL Compression: Compressed and Uncompressed Data Size

  • MySQL has information_schema.tables that contain information such as “data_length” or “avg_row_length.” Documentation on this table however is quite poor, making an assumption that those fields are self explanatory – they are not when it comes to tables that employ compression.

2. Sqoop Oracle Example : Getting Started with Oracle -> HDFS Import/Extract

  • In this post, we'll get Sqoop (1.99.3) connected to an Oracle database, extracting records to HDFS.

3. Stop Claiming That You’re Using a Schemaless Database

  • One of MongoDB’s arguments when evangelising MongoDB is the fact that MongoDB is a “schemaless” database... But it doesn’t mean that there is no schema.

4. How to Avoid Hash Collisions When Using MySQL’s CRC32 Function

  • Percona Toolkit’s pt-table-checksum performs an online replication consistency check by executing checksum queries on the master, which produces different results on replicas that are inconsistent with the master – and the tool pt-table-sync synchronizes data efficiently between MySQL tables.

5. Understanding of Execution Plan - III - A [ The OPERATORS ]

  • In this article we are mostly focusing on the Logical and Physical Operators and trying to understand each as it is very important to understand them before understanding the Execution Plan.


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