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MongoDB Administration 20110922

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MongoDB Administration 20110922

  1. 1. Administration Part Deux Michael DelNegro Principal Database Administrator AOL 1
  2. 2. Presentation Overview• Introduction• Usage• Best Practices• Lessons Learned• Resources• Upcoming 2
  3. 3. About Me• DBA at AOL (Dulles) for six years• Background in Sybase• Now MySQL, PostgreSQL and NoSQL• Was: Blogsmith, Uncut Video, Travel, Autos, Journals, Real Estate, Ficlets, Shopping• Currently: Patch, MapQuest, HSS, Datalayer, Demand• I Heart Big Data 3
  4. 4. About MongoDB• “Scalable, high-performance, open source, document-oriented database”• Databases (Databases) • Collections (Tables) • Documents (Rows) • Fields (Columns) - K/V Pairs• Indexes• No Joins • Favors Embedding Data instead of FKs 4
  5. 5. MongoDB Support• Operating Systems • Linux, Windows, Mac OS X, Solaris • 32bit, 64bit• Drivers • Java(MapQuest), Javascript, Perl, Ruby(Patch), Scala, Erlang, C, C#(Editions), C++, Haskell, PHP, Python • R, Smalltalk, node.js, ColdFusion 5
  6. 6. MongoDB Use Cases• Website Data Store• Caching Tier• Document and Content Mgmt Systems• Event Logging• Real-time Stats/Analytics• Archiving• High Volume Problems 6
  7. 7. MongoDB Misuse• Complex Transactional Systems• Traditional Business Intelligence• Small Data and/or Small Traffic• Should NOT be our default datastore • Use MySQL • or Use PostgreSQL, CouchBase, Redis, Riak, Hive/HBase,Vertica, Neteeza, TBD, etc... 7
  8. 8. Best Practices• Slaves are a MUST pre1.8• Use 64 bit version • 32 bit version has 2.5 GB storage limit• Use xfs or ext4• Keep eye on oplog size• Turn off atime & dtime• Consider using getLastError() 8
  9. 9. More Best Practices• Increase File Descriptor Limits• Do not use kill -9 (pre-1.8 or non- journaled)• At least 3 node replica sets• db.runCommand(“logRotate”)• Keep db.<collection>.totalIndexSize() less than RAM• Linux dirty_background_ratio (10->5%) and dirty_ratio (40->10%) (pre 2.6.22) 9
  10. 10. Even More• Use --rest (add 1000 to port)• Write To a Log• Take Advantage of 10gen’s MMS• Use Shortest and Readable Field Names as Possible• drop() is Much Faster Than remove() 10
  11. 11. Lessons Learned• Be Careful About Updates• Choose Shard Key Carefully• Turn Off Balancer During Peak Periods• Use Explain• Aggressively Upgrade Within Major Versions• Choose Embed vs Top-Level Collections Carefully 11
  12. 12. Top-Level Collections• Don’t Belong Conceptually To Another Collection• Building Blocks• Easily Referenceable and Updatable 12
  13. 13. Embedding Pros• Fast Retrieval of Document With Related Data• Atomic Updates• Ownership is obvious• Maps Better With Structure of Code 13
  14. 14. Embedding Cons• Harder To Query/Reference• Harder To Do Mass Queries• 16MB Limit Per Document• Err On Side Of Embedding• Note: Concepts Here Borrowed From Fantastic Preso By Ian White of Sailthru 14
  15. 15. Admin Resources• mongodb.org • Events • Forums • Presentations• Mongo Snippets (Github)• IRC (freenode #mongodb) 15
  16. 16. More Admin Resources• slideshare (Use Time-Based Search)• GUI Admin Tools • MongoVUE (Windows) • MongoHub (Mac) • Others• Kristina Chodorows Blog 16
  17. 17. Even More Resources• Follow @MongoQuestion (StackOverflow)• MongoDB on Quora (@q_mongodb)• Books• Training• Office Hours in NYC and Silicon Valley• 10gen Support (Email Me To Be Added)• DC MongoDB Users Group (@MongoDC) 17
  18. 18. New MongoDB Release• 2.0 (Released Last Week) • Journaling is Default • Per Collection/Index Compact Command • Concurrency Improvements • Reduced Default Stack Size • Index Performance Enhancements 18
  19. 19. More 2.0 Features• Map Reduce Performance Improvements• Replica Set Improvements • Priorities • Data-center Awareness• Release Notes• 2.0 Features Presentation 19
  20. 20. Future Releases• 2.2 (End of 2011?) • New Aggregation Framework • More Concurrency Improvements • Better Freelist Management• Beyond • Full-Text Search • Auto Compaction/Defrag 20
  21. 21. Thank You!• www.slideshare.net/radiocats• @radiocats on Twitter• www.linkedin.com/in/mdelnegro• Humble Plea 21

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