MemSQL

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MemSQL
MemSQL logo.
Developer(s) MemSQL Inc.
Stable release 4.1 / September 24, 2015; 26 days ago (2015-09-24)[1]
Written in C++
Operating system Linux
Type RDBMS
License Proprietary License
Website memsql.com

MemSQL is a distributed, in-memory database that is part of the NewSQL movement.[2] It is an ACID-compliant RDBMS that most notably converts SQL into C++ through code generation.[3] It is being developed by MemSQL Inc., that was founded in 2011 and is a graduate of the Y Combinator startup program. MemSQL Inc. has raised more than $40 million to date from a variety of investors including First Round Capital, IA Ventures, NEA, and several prominent angels including Paul Buchheit, Max Levchin, Aaron Levie, and Ashton Kutcher.[4] MemSQL Inc. launched its database to the public on June 18, 2012.[5]

Core Technology[edit]

MemSQL combines lock-free data structures and a just-in-time (JIT) compiler for processing highly volatile workloads.[6] More specifically, MemSQL implements lock-free hash tables and lock-free skiplists in memory for fast random access to data. Queries sent to the MemSQL server are converted into C++ and compiled through GCC.[7] Queries are stripped of their parameters and the query template is stored as a shared object which is subsequently matched against incoming queries to the system. Code generation and the execution of pre-compiled query plans removes interpretation along hot code paths, providing highly efficient code paths that minimize the number of CPU instructions required.

MemSQL is wire-compatible with MySQL.[8] Applications can connect to MemSQL through standard ODBC/JDBC connectors as well as MySQL clients and drivers.[9]

Durability[edit]

Even though MemSQL stores data in memory, MemSQL is durable by implementing a write-ahead log and snapshots (similar to checkpoints). On default settings, as soon as a transaction is acknowledged in memory, the database will write the transaction to disk as fast as the disk will allow.[10]

Replication[edit]

MemSQL supports a native replication protocol that ships its transactional log to slaves. MemSQL currently supports master-slave replication.

Distributed Architecture[edit]

MemSQL is a distributed database that works by the concept of aggregators and leaf nodes.[11] An aggregator is responsible for breaking up the query across the relevant leaf nodes and aggregating results back to the client. A leaf node is a MemSQL database. MemSQL uses hash partitioning to distribute data uniformly across the number of leaf nodes.[12] MemSQL made the distributed version of its system generally available on April 23, 2013[13] with a trial edition available for download on their website.[14]

Version History[edit]

  • MemSQL 1b - first general availability in June, 2012.[15]
  • MemSQL 1c - minor feature update, released July 2012.
  • MemSQL 1.8 - replication and expanded SQL surface area, released December 2012
  • MemSQL 2.0 - general availability of distributed system.[16] First release of MemSQL Watch operational dashboard.[17]
  • MemSQL 2.5 - JSON Data type[18]
  • MemSQL 3.0 - Columnar data store[19]
  • MemSQL 3.1 - Views, Cross-Datacenter replication[20]
  • MemSQL 3.2 - Improvements to column store engine[21]
  • MemSQL 4.0 - Geospatial support, distributed joins[22]
  • MemSQL 4.1 - Integration with Spark, CTEs[23]

References[edit]

  1. ^ http://blog.memsql.com/spark-streamliner/
  2. ^ "MemSQL". Retrieved 2012-10-07. 
  3. ^ "MemSQL Key Concepts". Retrieved 2014-09-27. 
  4. ^ Empson, Rip (2012). "Accelerate Your Database: MemSQL Launches With $5M From Ashton Kutcher, Max Levchin & More" (published 2012-06-18). Retrieved 2012-10-07. 
  5. ^ Harris, Derrick (2012). "Ex-Facebookers Launch MemSQL to Make your Database Fly" (published 2012-06-18). Retrieved 2012-10-07. 
  6. ^ http://vimeo.com/44087431
  7. ^ http://developers.memsql.com/docs/1c/codegen.html
  8. ^ http://developers.memsql.com/docs/1c/cli.html
  9. ^ http://www.i-programmer.info/news/84-database/4397-memsql-80000-queries-per-second.html
  10. ^ http://developers.memsql.com/docs/1c/faq.html#durability
  11. ^ http://highscalability.com/blog/2012/8/14/memsql-architecture-the-fast-mvcc-inmem-lockfree-codegen-and.html
  12. ^ http://www.dbms2.com/2012/06/18/introduction-to-memsql/
  13. ^ http://www.dbms2.com/2013/04/23/memsql-scales-out/
  14. ^ http://www.memsql.com/download
  15. ^ http://vimeo.com/44087431
  16. ^ http://www.dbms2.com/2013/04/23/memsql-scales-out/
  17. ^ http://developers.memsql.com/docs/2.0/2.0releasenotes.html
  18. ^ http://developers.memsql.com/docs/latest/release_notes/2.5releasenotes.html
  19. ^ http://www.memsql.com/whats-new/
  20. ^ http://developers.memsql.com/docs/latest/release_notes/3.1releasenotes.html
  21. ^ http://developers.memsql.com/docs/latest/release_notes/3.2releasenotes.html
  22. ^ http://developers.memsql.com/docs/latest/release_notes/4.0releasenotes.html
  23. ^ http://developers.memsql.com/docs/latest/release_notes/4.1releasenotes.html

External links[edit]

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