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ἑκατόν

ἑκατόν. by Niko Neugebauer. Niko Neugebauer. PASS Evangelist SQL Server MVP SQLPort ( http://www.sqlport.com ) founder & leader BITuga ( http://www.bituga.pt ) co -founder 15+ years in IT. HeKATON. HEK-A-TON, HEK-A-TON, HEK-A-TON. HekAton. ἑκατόν – means 100 in Greek

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ἑκατόν

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  1. ἑκατόν by NikoNeugebauer

  2. NikoNeugebauer • PASS Evangelist • SQL Server MVP • SQLPort (http://www.sqlport.com) founder & leader • BITuga(http://www.bituga.pt) co-founder • 15+ years in IT

  3. HeKATON HEK-A-TON, HEK-A-TON, HEK-A-TON

  4. HekAton • ἑκατόν – means 100 inGreek • Targeted to improve OLTP performance, 100 Times

  5. Conceptionally? • Imagine that you have a number of CPU steps to perform a typical OLTP action • Optimize it 100 times by removing obstacles like latches and parallelize it • Yes, you will need start from the bottom and from the very beginning?

  6. Hardware Trends • Look at the CPU speed increase • Look at the Memory Prices • You can’t buy a SQL Server Enterprise License for a price of a TB • Think, think, think 

  7. New generation DB Hekaton

  8. History Sybase SQL Server 1.0 SQL Server 11.0 2012 Hardware Cheap IO & Memory Bound Pages 8K • 1980 (1989) • Hardware Expensive • CPU Bound • Pages 8K

  9. Hekaton • In-Memory Database • Multi-Core Awareness and Optimizations • xVelocity compression algorithm (hint: ColumnStore) • No Pages (no more splits, allocations, etc) • No Locks, No Latches + different Concurrency Control • StreamInsight (no more 8K’s) • Hash Index (no more b-trees) • Existing T-SQL can be reused

  10. Hekaton • Highly scalable concurrency control mechanism • Lock-free data structures

  11. Hekaton • ACID compliant • Optimized for extreme Transaction Processing scenarios like • Financial Services • Online Gambling • There are customers who are using it NOW

  12. Integrated into the DataBase Engine Hekaton

  13. Particular Features • Snapshot_Isolation ONLY • No support for LOB data types • No Triggers • AlwaysOn Support

  14. features • Durable Tables • Non-Durable Tables • TempDB is used inside of the Hekaton, in-memory • Shares memory with Buffer Pool, but has its own space

  15. Architecture • Different space allocation for memory buffer • The very same transaction log, but with fewer writes • Different filegroups • Different treatment for Indexes • A lot of new, different stuff 

  16. HEKATON It actually looks like a …

  17. Programability • Create table dbo.Hekaton( • Id int primary key hash with (bucketcount = 65535), • Nome varchar(50) ) WITH (MEMORY_OPTIMIZED = ON, DURABILITY = SCHEMA_AND_DATA ); GO

  18. T-SQL Stored Procs: • Uses C as internal intermediate presentation, and then compiles into native code • Atomic blocks • Can’t reference non-hekaton tables

  19. T-SQL Programability • Create procedure dbo.HekatonNow • WITH NATIVE_COMPILATION BEGIN select name from dbo.Hekaton; END GO

  20. Details • Uses StreamInsight • No actual updates, but deletes & inserts

  21. UTils • Migration from the normal DB tables to Hekaton • Stored Procedures Migration to Hekaton

  22. WHEN ? Next major version of SQL Server

  23. BUT • Isn’t it too fast ? • – No, there is no such concept as too fast. (as long as it does not create other problems)

  24. Thank you

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