Oren Eini

CEO of RavenDB

a NoSQL Open Source Document Database

Get in touch with me:

oren@ravendb.net +972 52-548-6969

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Comments: 51,161

Copyright ©️ Ayende Rahien 2004 — 2025

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RavenDB - Version 6.2 Now Live
4posts

RavenDB 7.1

  1. (17 Feb 2025)

    Shared Journals (26 days from now)

  2. (14 Feb 2025)

    Reclaiming disk space (23 days from now)

  3. (12 Feb 2025)

    Write modes (21 days from now)

  4. (10 Feb 2025)

    Next-Gen Pagers (19 days from now)

77posts

Challenge

  1. (03 Feb 2025)

    Giving file system developer ulcer (12 days from now)

  2. (20 Jan 2025)

    What does this code do?
  3. (01 Jul 2024)

    Efficient snapshotable state
  4. (13 Oct 2023)

    Fastest node selection metastable error state–answer
  5. (12 Oct 2023)

    Fastest node selection metastable error state
  6. (19 Sep 2023)

    Spot the bug
  7. (04 Jan 2023)

    what does this code print?
  8. (14 Dec 2022)

    What does this code print?
  9. (01 Jul 2022)

    Find the stack smash bug… – answer
  10. (30 Jun 2022)

    Find the stack smash bug…
  11. (03 Jun 2022)

    Spot the data corruption
  12. (06 May 2022)

    Spot the optimization–solution
  13. (05 May 2022)

    Spot the optimization
  14. (06 Apr 2022)

    Why is this code broken?
  15. (16 Dec 2021)

    Find the slow down–answer
  16. (15 Dec 2021)

    Find the slow down
  17. (03 Nov 2021)

    The code review bug that gives me nightmares–The fix
  18. (02 Nov 2021)

    The code review bug that gives me nightmares–the issue
  19. (01 Nov 2021)

    The code review bug that gives me nightmares
  20. (16 Jun 2021)

    Detecting livelihood in a distributed cluster
  21. (21 Apr 2020)

    Generate matching shard id–answer
  22. (20 Apr 2020)

    Generate matching shard id
  23. (02 Jan 2020)

    Spot the bug in the stream
  24. (28 Sep 2018)

    The loop that leaks–Answer
  25. (27 Sep 2018)

    The loop that leaks
  26. (03 Apr 2018)

    The invisible concurrency bug–Answer
  27. (02 Apr 2018)

    The invisible concurrency bug
  28. (31 Jan 2018)

    Find the bug in the fix–answer
  29. (30 Jan 2018)

    Find the bug in the fix
  30. (19 Jan 2017)

    What does this code do?
  31. (26 Jul 2016)

    The race condition in the TCP stack, answer
  32. (25 Jul 2016)

    The race condition in the TCP stack
  33. (28 Apr 2015)

    What is the meaning of this change?
  34. (26 Sep 2013)

    Spot the bug
  35. (27 May 2013)

    The problem of locking down tasks…
  36. (17 Oct 2011)

    Minimum number of round trips
  37. (23 Aug 2011)

    Recent Comments with Future Posts
  38. (02 Aug 2011)

    Modifying execution approaches
  39. (29 Apr 2011)

    Stop the leaks
  40. (23 Dec 2010)

    This code should never hit production
  41. (17 Dec 2010)

    Your own ThreadLocal
  42. (03 Dec 2010)

    Querying relative information with RavenDB
  43. (29 Jun 2010)

    Find the bug
  44. (23 Jun 2010)

    Dynamically dynamic
  45. (28 Apr 2010)

    What killed the application?
  46. (19 Mar 2010)

    What does this code do?
  47. (04 Mar 2010)

    Robust enumeration over external code
  48. (16 Feb 2010)

    Premature optimization, and all of that…
  49. (12 Feb 2010)

    Efficient querying
  50. (10 Feb 2010)

    Find the resource leak
  51. (21 Oct 2009)

    Can you spot the bug?
  52. (18 Oct 2009)

    Why is this wrong?
  53. (17 Oct 2009)

    Write the check in comment
  54. (15 Sep 2009)

    NH Prof Exporting Reports
  55. (02 Sep 2009)

    The lazy loaded inheritance many to one association OR/M conundrum
  56. (01 Sep 2009)

    Why isn’t select broken?
  57. (06 Aug 2009)

    Find the bug fixes
  58. (26 May 2009)

    Find the bug
  59. (14 May 2009)

    multi threaded test failure
  60. (11 May 2009)

    The regex that doesn’t match
  61. (24 Mar 2009)

    probability based selection
  62. (13 Mar 2009)

    C# Rewriting
  63. (18 Feb 2009)

    write a self extracting program
  64. (04 Sep 2008)

    Don't stop with the first DSL abstraction
  65. (02 Aug 2008)

    What is the problem?
  66. (28 Jul 2008)

    What does this code do?
  67. (26 Jul 2008)

    Find the bug fix
  68. (05 Jul 2008)

    Find the deadlock
  69. (03 Jul 2008)

    Find the bug
  70. (02 Jul 2008)

    What is wrong with this code
  71. (05 Jun 2008)

    why did the tests fail?
  72. (27 May 2008)

    Striving for better syntax
  73. (13 Apr 2008)

    calling generics without the generic type
  74. (12 Apr 2008)

    The directory tree
  75. (24 Mar 2008)

    Find the version
  76. (21 Jan 2008)

    Strongly typing weakly typed code
  77. (28 Jun 2007)

    Windsor Null Object Dependency Facility
13posts

Answer

  1. (22 Jan 2025)

    What does this code do?
  2. (05 Jan 2023)

    what does this code print?
  3. (15 Dec 2022)

    What does this code print?
  4. (07 Apr 2022)

    Why is this code broken?
  5. (20 Jan 2017)

    What does this code do?
  6. (16 Aug 2011)

    Modifying execution approaches
  7. (30 Apr 2011)

    Stopping the leaks
  8. (24 Dec 2010)

    This code should never hit production
  9. (21 Dec 2010)

    Your own ThreadLocal
  10. (11 Feb 2010)

    Debugging a resource leak
  11. (03 Sep 2009)

    The lazy loaded inheritance many to one association OR/M conundrum
  12. (04 Sep 2008)

    Don't stop with the first DSL abstraction
  13. (12 Jun 2008)

    How many tests?
2posts

Production post-mortem

  1. (17 Jan 2025)

    Inspecting ourselves to death
  2. (18 Aug 2020)

    Too much RAM and the unstable cluster
2posts

Performance discovery

  1. (10 Jan 2025)

    IOPS vs. IOPS
  2. (03 Jan 2025)

    Managed vs. Unmanaged memory
2posts

RavenDB Cloud

  1. (26 Nov 2024)

    Auto scaling
  2. (21 Apr 2022)

    Metrics & Disk I/O enhancements
14posts

Recording

  1. (19 Jun 2024)

    Building a Database Engine in C# & .NET
  2. (05 Mar 2024)

    Technology & Friends - Oren Eini on the Corax Search Engine
  3. (15 Jan 2024)

    S06E09 - From Code Generation to Revolutionary RavenDB
  4. (02 Jan 2024)

    .NET Rocks Data Sharding with Oren Eini
  5. (01 Jan 2024)

    .NET Core podcast on RavenDB, performance and .NET
  6. (28 Aug 2023)

    RavenDB and High Performance with Oren Eini
  7. (17 Feb 2023)

    RavenDB Usage Patterns
  8. (12 Dec 2022)

    Software architecture with Oren Eini
  9. (17 Nov 2022)

    RavenDB in a Distributed Cloud Environment
  10. (25 Jul 2022)

    Build your own database at Cloud Lunch & Learn
  11. (15 Jul 2022)

    Non relational data modeling & Database engine internals
  12. (11 Apr 2022)

    Clean Architecture with RavenDB
  13. (14 Mar 2022)

    Database Security in a Hostile World
  14. (02 Mar 2022)

    RavenDB–a really boring database
33posts

re

  1. (28 May 2024)

    Secure Drop protocol
  2. (16 Aug 2022)

    How Discord supercharges network disks for extreme low latency
  3. (02 Jun 2022)

    BonsaiDb performance update
  4. (14 Jan 2022)

    Are You Sure You Want to Use MMAP in Your Database Management System?
  5. (09 Dec 2021)

    Why IndexedDB is slow and what to use instead
  6. (23 Jun 2021)

    The performance regression odyssey
  7. (27 Oct 2020)

    Investigating query performance issue in RavenDB
  8. (27 Dec 2019)

    Writing a very fast cache service with millions of entries
  9. (26 Dec 2019)

    Why databases use ordered indexes but programming uses hash tables
  10. (12 Nov 2019)

    Document-Level Optimistic Concurrency in MongoDB
  11. (25 Oct 2019)

    RavenDB. Two years of pain and joy
  12. (19 Aug 2019)

    The Order of the JSON, AKA–irresponsible assumptions and blind spots
  13. (10 Oct 2017)

    Entity Framework Core performance tuning–Part III
  14. (09 Oct 2017)

    Different I/O Access Methods for Linux
  15. (06 Oct 2017)

    Entity Framework Core performance tuning–Part II
  16. (04 Oct 2017)

    Entity Framework Core performance tuning–part I
  17. (26 Apr 2017)

    Writing a Time Series Database from Scratch
  18. (28 Jul 2016)

    Why Uber Engineering Switched from Postgres to MySQL
  19. (15 Jun 2016)

    Why you can't be a good .NET developer
  20. (12 Nov 2013)

    Why You Should Never Use MongoDB
  21. (21 Aug 2013)

    How memory mapped files, filesystems and cloud storage works
  22. (15 Apr 2012)

    Kiip’s MongoDB’s experience
  23. (18 Oct 2010)

    Diverse.NET
  24. (10 Apr 2010)

    NoSQL, meh
  25. (30 Sep 2009)

    Are you smart enough to do without TDD
  26. (17 Aug 2008)

    MVC Storefront Part 19
  27. (24 Mar 2008)

    How to create fully encapsulated Domain Models
  28. (21 Feb 2008)

    Versioning Issues With Abstract Base Classes and Interfaces
  29. (18 Aug 2007)

    Saving to Blob
  30. (27 Jul 2007)

    SSIS - 15 Faults Rebuttal
  31. (29 May 2007)

    The OR/M Smackdown
  32. (06 Mar 2007)

    IoC and Average Programmers
  33. (19 Sep 2005)

    DLinq Mapping
2posts

Meta Blog

  1. (23 Jan 2024)

    I'm a JS Developer now
  2. (17 Jan 2024)

    Blogging ergonomics in 2024
51posts

Production Postmortem

  1. (12 Dec 2023)

    The Spawn of Denial of Service
  2. (24 Jul 2023)

    The dog ate my request
  3. (03 Jul 2023)

    ENOMEM when trying to free memory
  4. (27 Jan 2023)

    The server ate all my memory
  5. (23 Jan 2023)

    The big server that couldn’t handle the load
  6. (16 Jan 2023)

    The heisenbug server
  7. (03 Oct 2022)

    Do you trust this server?
  8. (15 Sep 2022)

    The missed indexing reference
  9. (05 Aug 2022)

    The allocating query
  10. (22 Jul 2022)

    Efficiency all the way to Out of Memory error
  11. (18 Jul 2022)

    Broken networks and compressed streams
  12. (13 Jul 2022)

    Your math is wrong, recursion doesn’t work this way
  13. (12 Jul 2022)

    The data corruption in the node.js stack
  14. (11 Jul 2022)

    Out of memory on a clear sky
  15. (29 Apr 2022)

    Deduplicating replication speed
  16. (25 Apr 2022)

    The network latency and the I/O spikes
  17. (22 Apr 2022)

    The encrypted database that was too big to replicate
  18. (20 Apr 2022)

    Misleading security and other production snafus
  19. (03 Jan 2022)

    An error on the first act will lead to data corruption on the second act…
  20. (13 Dec 2021)

    The memory leak that only happened on Linux
  21. (17 Sep 2021)

    The Guinness record for page faults & high CPU
  22. (07 Jan 2021)

    The file system limitation
  23. (23 Mar 2020)

    high CPU when there is little work to be done
  24. (21 Feb 2020)

    The self signed certificate that couldn’t
  25. (31 Jan 2020)

    The slow slowdown of large systems
  26. (07 Jun 2019)

    Printer out of paper and the RavenDB hang
  27. (18 Feb 2019)

    This data corruption bug requires 3 simultaneous race conditions
  28. (25 Dec 2018)

    Handled errors and the curse of recursive error handling
  29. (23 Nov 2018)

    The ARM is killing me
  30. (22 Feb 2018)

    The unavailable Linux server
  31. (06 Dec 2017)

    data corruption, a view from INSIDE the sausage
  32. (01 Dec 2017)

    The random high CPU
  33. (07 Aug 2017)

    30% boost with a single line change
  34. (04 Aug 2017)

    The case of 99.99% percentile
  35. (02 Aug 2017)

    The lightly loaded trashing server
  36. (23 Aug 2016)

    The insidious cost of managed memory
  37. (05 Feb 2016)

    A null reference in our abstraction
  38. (27 Jan 2016)

    The Razor Suicide
  39. (13 Nov 2015)

    The case of the “it is slow on that machine (only)”
  40. (21 Oct 2015)

    The case of the slow index rebuild
  41. (22 Sep 2015)

    The case of the Unicode Poo
  42. (03 Sep 2015)

    The industry at large
  43. (01 Sep 2015)

    The case of the lying configuration file
  44. (31 Aug 2015)

    The case of the memory eater and high load
  45. (14 Aug 2015)

    The case of the man in the middle
  46. (05 Aug 2015)

    Reading the errors
  47. (29 Jul 2015)

    The evil licensing code
  48. (23 Jul 2015)

    The case of the native memory leak
  49. (16 Jul 2015)

    The case of the intransigent new database
  50. (13 Jul 2015)

    The case of the hung over server
  51. (09 Jul 2015)

    The case of the infected cluster

FUTURE POSTS

  1. Partial writes, IO_Uring and safety - about one day from now
  2. Configuration values & Escape hatches - 5 days from now
  3. What happens when a sparse file allocation fails? - 7 days from now
  4. NTFS has an emergency stash of disk space - 9 days from now
  5. Challenge: Giving file system developer ulcer - 12 days from now

And 4 more posts are pending...

There are posts all the way to Feb 17, 2025

RECENT SERIES

  1. Challenge (77):
    20 Jan 2025 - What does this code do?
  2. Answer (13):
    22 Jan 2025 - What does this code do?
  3. Production post-mortem (2):
    17 Jan 2025 - Inspecting ourselves to death
  4. Performance discovery (2):
    10 Jan 2025 - IOPS vs. IOPS
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