(MongoDB by Kristina Chodorow) PDF FREE ✓ Kristina Chodorow
Cyberselfish A Critical Romp Through The Terribly Libertarian Culture Of High Tech lAverage book Covers only basics unnecessarily describes things easily found elsewhereike arguments of mongodump or mongo commands Often explains obvious things Recommended only for very
BEGINNERS GIVES A GOOD OVERVIEW ON Gives a good overview on concepts with code examples Works as a nice primer for novice and reference point for advanced techies By the title of the book that is The Definitive Guide I was hoping that the authors could point out some kind of work patterns that could be considered as
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With The Current Documentation On The Sidethe current documentation on the side be aware of the differences A very detailed coverage of all MongoDB aspects development administration monitoring and performance tuning accompanied with ots of pearls of wisdom and typical gotchas It s awesome book to get a feel of MongoDB Much much better than any course on MongoDB The Mindful Living with Aspergers Syndrome last third of the book is appendices so apparently all the while I was doner than I thought I was It s a great book but it s short Ign an application that works well with MongoDB Aggregate data including counting finding distinct values grouping documents and using MapReduce Gather and interpret statistics about your collections and databases Set up replica sets and automatic failover in MongoDB Use sharding to scale horizontally andearn how it impacts applications Delve into monitoring security and authentication backuprestore and other administrative task. Ged To modify all of thedocuments matching the criteria you can pass true as the fourth parameter to update The same getLastError command that powers safe mode also containsfunctionality for checking that operations have been successfully repli cated Chapter 4 uerying1 collectionfind get all the documents from a collection2 collectionfindage 27 get all the document that have the age
273 COLLECTIONFINDAGE 27USERNAME 1 EMAIL 1 GET ALL THEcollectionfindage 27username 1 email 1 get all the only the "keys username and email4 collectionfindage 27username 0 id 0 return all except username "username and email4 collectionfindage 27username 0 id 0 return all except username id uery Criteriacomparison operators t te gt gte Ex start new Date04042007 dbusersfindregistered t start show all the registered users before 04 04 2007 ne which stands for not eual dbusersfindusername ne joe show all users that aren t called joeOR ueries can be user or or in nin is the opposite of in dbcinemafindseat in 7 42 90not is used to negate a statementIf we only want to find keys whose value is null we can check that the key is null andexists using the exists conditional dbcfindz in null exists trueRegular expressions dbusersfindname joeyi Find all the users that are joey case insensitiveCursors while cursorhasNext obj cursornext execute Limits Skips and Sorts dbcfindlimit3 return only 3 results dbcfindskip3 will skip the first three matching documents and return the rest of the matches dbcfindsortusername 1 age 1 sort the results by username ascending and age descendingChapter 5 Indexing MongoDB s indexes work almost identically to typical relational data base indexes To create the index use the ensureIndex method Example if we want to index on the people dbpeopleensureIndexusername 1 If you have than one key you need to start thinking about index direction dbstatusensureIndexuser 1 date 1 uery by user and date to pull up all of a user s recent statuses Indexes can be created on keys in embedded documents in the same way that they arecreated on normal keys Uniue indexes guarantee that for a given key every document in the collection willhave a uniue value dbpeopleensureIndexusername 1 uniue true explain will return information about the indexes used for the uery if any and statsabout timing and the number of documents scanned dbpeoplefindexplain dbpeopleensureIndexusername 1 background trueBuilding indexes is time consuming and resource intensive Using the background true option builds the index in the background while handling incoming reuests Ifyou do not include the background option the database will block all other reuestswhile the index is being built you can remove it with the dropIndexes command and the index name dbrunCommanddropIndexes foo index alphabetGeospatial Indexing A geospatial index can be created using the ensureIndex function but by passing 2d as a value instead of 1 or 1 dbmapensureIndexgps 2dThe gps key must be some type of pair value that is a two element array or embeddeddocument with two keys These would all be valid gps 0 100 gps x 30 y 30 gps Space Kid latitude 180ongitude 180 For example the following code returns the 10 nearest documents to 40 73 coordinates dbmapfindgps near 40 73limit10MongoDB also allows you to find all of the documents within a shape as well as neara pointThere are two options you can uery for all points within a rectangle or a circleTo use a rectangle use the box option dbmapfindgps within box 10 20 15 30box takes a two element array the first element specifies the coordinates of thelower Circumstantial Evidence: Death, Life, and Justice in a Southern Town left corner the second element the upper rightAlso you can find all points within a circle with center which takes an array withthe center point and then a radius dbmapfindgps within center 12 25 5Chapter 6 Aggregation count dbfoocountcount the number of results for that uery dbfooinsertx 2 distinct command finds all of the distinct values for a given key You must specifya collect. For system administrators and an overview of the concepts and use cases for other people on your project Ideal for NoSL newcomers and experienced MongoDB users alike this guide provides numerous real world schema design examples Get started with MongoDB core concepts and vocabulary Perform basic write operations at differentevels of safety and speed Create complex ueries with options for imiting skipping and sorting results Des. .