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MongoDB                	       id:matsuou1
!  !  !  !  !  !           Tips!  
!   ID      matsuou1!                 	                 	 !        !        !        !      Oracle     PostgreSQL!        ...
1. 2. 3. 4. 
!  !   RDBMS!  
!  !  
MongoDB         	 !        !               CPU!        !   JOIN!  
•      •    100         insert update    delete     •      •                nscanned        10• 
db/queryoptimizer.cpp
!                                          explain                 	       > db.logs.find({uid:"a10Sty5jqqiyxxxx2"}).expla...
cursor	             BasicCursor	                   	                                        BasicCursor or BtreeCursor 	 n...
(                                       )	 > db.logs.find({uid:"a10Sty5jqqiyxxxx2"}).explain();{           "cursor" : "Bas...
(                                      )	 > db.logs.find({uid:"b3iVxMGIEc3xxxxY"}).explain();{     "cursor" : "BtreeCursor...
!        !     slowms      !              ! db.setProfilingLevel(level,slowms)      !  
slowms                                                	 !   mongod                          slowms                        ...
setProfilingLevel	                                                     setProfilingLevel     (level,slowms)               ...
setProfilingLevel	               system.profile                                                            	 > db.system.p...
db.currentOp                                                 	         	          	 opid	                      ID    KillO...
> db.currentOp();{           "inprog" : [                          {                                   "opid" : 272,      ...
slowms	                                        	 db.setProfilingLevel	    collection         system.profile   capped colle...
Tips
!                                                                    	   • db.c.find( {x:10,y:20} ), using index {x:1,y:1}...
hint	 !   hint!  
hint	 > db.logs.find({uid:"f2RNwtj34m3xxxxB" , path : "/index.html"}).hint({uid:1}).explain();{           "cursor" : "Btre...
hint	 > db.logs.find({uid:"f2RNwtj34m3xxxxB" , path : "/index.html"}).hint({uid:1 , path:1}).explain();{           "cursor...
mongostat	       mongostat                                                   	          	                            	    ...
mongostat                                                       	          	          	 inserts	      insert /        	 qu...
collection                                                   	 !   getIndexKeys()                                     	  >...
!   db.currentOp              opid                   db.killOp(opid)                                 	  > db.currentOp(); ...
!  !        !   explain!        !   slowms      !   setProfilingLevel      !   db.currentOP!                     Tips     ...
20110514 mongo dbチューニング
20110514 mongo dbチューニング
20110514 mongo dbチューニング
20110514 mongo dbチューニング
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20110514 mongo dbチューニング

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第3回MongoDB勉強会の発表資料です。

Published in: Technology, Business
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20110514 mongo dbチューニング

  1. 1. MongoDB id:matsuou1
  2. 2. !  !  !  !  !  !   Tips!  
  3. 3. !   ID matsuou1!   !   !   !   !   Oracle PostgreSQL!   MongoDB Hadoop R
  4. 4. 1. 2. 3. 4. 
  5. 5. !  !   RDBMS!  
  6. 6. !  !  
  7. 7. MongoDB !   !   CPU!   !   JOIN!  
  8. 8. •  •  100 insert update delete •  •  nscanned 10• 
  9. 9. db/queryoptimizer.cpp
  10. 10. !   explain > db.logs.find({uid:"a10Sty5jqqiyxxxx2"}).explain(); { "cursor" : "BasicCursor", "nscanned" : 2669511, "nscannedObjects" : 2669511, "n" : 3, "millis" : 6100, "nYields" : 0, "nChunkSkips" : 0, "isMultiKey" : false, "indexOnly" : false, "indexBounds" : { } }
  11. 11. cursor BasicCursor BasicCursor or BtreeCursor nscanned 14 nscannedObjects 14 n 14 millis 9 ms nYields 0nChunkSkips 0 Chunk isMultiKey false indexOnly false indexBounds scanAndOrder allPlans
  12. 12. ( ) > db.logs.find({uid:"a10Sty5jqqiyxxxx2"}).explain();{ "cursor" : "BasicCursor", "nscanned" : 2669511, "nscannedObjects" : 2669511, "n" : 3, "millis" : 6100, "nYields" : 0, 6100ms "nChunkSkips" : 0, 3 266 "isMultiKey" : false, "indexOnly" : false, "indexBounds" : { }}
  13. 13. ( ) > db.logs.find({uid:"b3iVxMGIEc3xxxxY"}).explain();{ "cursor" : "BtreeCursor uid_1", "nscanned" : 3, "nscannedObjects" : 3, "n" : 3, "millis" : 6, ”uid_1” "nYields" : 0, 6ms "nChunkSkips" : 0, 3 3 "isMultiKey" : false, "indexOnly" : false, "indexBounds" : { "uid" : [ [ "b3iVxMGIEc3xxxxY", "b3iVxMGIEc3xxxxY" ] ] }}
  14. 14. !   ! slowms !   ! db.setProfilingLevel(level,slowms) !  
  15. 15. slowms !   mongod slowms ms mongod mongod --logpath=/var/log/mongodb/mongodb.log --logappend –slowms 500 Sat May 14 02:25:53 [conn16] query logdb.$cmd ntoreturn:1command: { count: "logs", query: { path: "/index.html" }, fields: {} } reslen:64 3116ms
  16. 16. setProfilingLevel setProfilingLevel (level,slowms) > db.setProfilingLevel(1,500); { "was" : 1, "slowms" : 100, "ok" : 1 } 100ms
  17. 17. setProfilingLevel system.profile > db.system.profile.find();{ "ts" : ISODate("2011-05-01T03:40:04.462Z"), "info" : "query logdb.logs reslen:192nscanned:2669511 nquery: { uid: "b2kwyYCXn3b5Scpr" } nreturned:1 6686ms","millis" : 6686 } ts millis info query query query nscanned reslen nreturned
  18. 18. db.currentOp opid ID KillOp op query update ns query lockType waitingForLock client desc
  19. 19. > db.currentOp();{ "inprog" : [ { "opid" : 272, "active" : true, "lockType" : "read", "waitingForLock" : false, "secs_running" : 20, "op" : "query", "ns" : "logdb.logs", "query" : { "count" : "logs", "query" : { "month" : "2010/02" }, "fields" : { } }, "client" : "127.0.0.1:59394", "desc" : "conn" }]}
  20. 20. slowms db.setProfilingLevel collection system.profile capped collection db.currentOp MongoDB
  21. 21. Tips
  22. 22. !   • db.c.find( {x:10,y:20} ), using index {x:1,y:1} • db.c.find( {x:10,y:20} ), using index {x:1,y:-1} • db.c.find( {x:{$in:[10,20]},y:20} ), using index {x:1,y:1} • db.c.find().sort( {x:1,y:1} ), using index {x:1,y:1} • db.c.find().sort( {x:-1,y:1} ), using index {x:1,y:-1} • db.c.find( {x:10} ).sort( {y:1} ), using index {x: 1,y:1}
  23. 23. hint !   hint!  
  24. 24. hint > db.logs.find({uid:"f2RNwtj34m3xxxxB" , path : "/index.html"}).hint({uid:1}).explain();{ "cursor" : "BtreeCursor uid_1", "nscanned" : 95, "nscannedObjects" : 95, "n" : 35, "millis" : 3, "nYields" : 0, "nChunkSkips" : 0, "isMultiKey" : false, "indexOnly" : false, "indexBounds" : { "uid" : [ [ "f2RNwtj34m3xxxxB", "f2RNwtj34m3xxxxB" ] ] }}
  25. 25. hint > db.logs.find({uid:"f2RNwtj34m3xxxxB" , path : "/index.html"}).hint({uid:1 , path:1}).explain();{ "cursor" : "BtreeCursor uid_1_path_1", "nscanned" : 35, "nscannedObjects" : 35, "n" : 35, "millis" : 0, "nYields" : 0, "nChunkSkips" : 0, "isMultiKey" : false, "indexOnly" : false, "indexBounds" : { "uid" : [ [ "f2RNwtj34m3xxxxB", "f2RNwtj34m3xxxxB" ] ], ( ) }}
  26. 26. mongostat mongostat
  27. 27. mongostat inserts insert / query query / update update / delete delete / getmore getmore / command command / flushes fsync flush / mapped Map MB visze MB res MB faults / locked Idx miss qr|qw read | write ar|aw read | write netIn In bits netOut Out bits conn
  28. 28. collection !   getIndexKeys() > db.logs.getIndexKeys(); [ { "_id" : 1 }, { "uid" : 1 }, { "uid" : 1, "path" : 1 } ]
  29. 29. !   db.currentOp opid db.killOp(opid) > db.currentOp(); { "inprog" : [ { "opid" : 308, "active" : true, "lockType" : "read", "waitingForLock" : false, "secs_running" : 11, "op" : "query", "ns" : "logdb.logs", ( ) } ] } > db.killOp(308); { "info" : "attempting to kill op" }
  30. 30. !  !   !   explain!   !   slowms !   setProfilingLevel !   db.currentOP!   Tips !   !   Hint !   mongostat

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