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Previous Chapter

Appendix C. Binary data and GridFS

List of Figures

Index

[SYMBOL][A][B][C][D][E][F][G][H][I][J][K][L][M][N][O][P][Q][R][S][T][U][V][W][X][Y][Z]

SYMBOL

. (dot operator), with queries . character, 2^nd @tweets variable $** field $ character, 2^nd, 3^rd => character > character -9 command-line option 10gen, subscription services 32-bit integer type 64-bit integer type

A

ad hoc queries $add function additionalOptions object address already in use (error message) address_length field addshard command addShard() method add_to_cart function, 2^nd $addToSet operator, 2^nd, 3^rd, 4^th, 5^th administrative tasks compaction and repair data imports and exports upgrading aggregate() function, 2^nd, 3^rd aggregation framework operators $sort $unwind overview pipeline performance aggregation cursor option allowDiskUse option explain( ) function options reshaping documents arithmetic functions date functions logical functions miscellaneous functions set operators string functions. See e-commerce aggregation example. agile development AGPL (GNU-Affero General Public License) $all operator $allElementsTrue function allowDiskUse option, 2^nd allPlans key allPlansExecution mode Amazon EC2 analytics ancestor_list array ancestors attribute $and operator, 2^nd antipatterns bucket collections careless indexing large, deeply nested documents motley types one collection per user unshardable collections $anyElementTrue function Apache license AppEngine application data, storage of arbiterOnly option, 2^nd arbiters architecture hardware installation problems and ArchLinux arithmetic functions Array type arrays querying for, by size update operators for atime, disabling atomic document processing inventory management failure inventory fetcher inventory management order state transitions finishing order preparing order for checkout verifying order and authorization attributes, dynamic authentication basic, setting up removing user service authentication user authentication authors field average product ratings average review, calculating $avg function, 2^nd

B

background indexing backups data file-based backups for sharded clusters indexes MMS backups mongodump and mongorestore balancer BasicCursor, 2^nd Bayer, Rudolf binary data, simple binary storage storing an MD5 storing thumbnails Binary JSON. See BSON. Binary type --bind_ip option $bit operator, 2^nd BLOB (binary large object) type book index example compound index indexing rules simple index books collection, 2^nd Boolean operators Bostic, Keith BSON (Binary JSON) BSON files, restoring bson gem BSON types, min key and max key BSON::Binary constructor bsondump tool, 2^nd, 3^rd bson_ext gem BSON::OrderedHash class BtreeCursor B-trees estimating storage size maximum key size node structure bucket collections buildIndexes option

C

caching Cahill, Michael capacity planning capped collections careless indexing case-insensitive search Cassandra database categorical failures categories collection, 2^nd categories field category hierarchy category_id field category_ids field CentOS certificate authentication changelog collection chmod chown chunks as data unit, 2^nd collection storing chunk ranges counting pre-splitting for faster distribution problem when too large to split splitting and migrating of clean failures clocks close field cluster topology $cmd collection coarse granularity collectionConfig.blockCompressor option collections, 2^nd as data unit automatic creation of capped collections drop() method listing managing collections sharding existing sharding within stats system collections time-to-live (TTL) collections. See also system collections. collstats command, 2^nd command method command shell command-line options commands implementation of runCommand() method running from MongoDB Ruby driver Comma-Separated Values. See CSV (Comma-Separated Values). commits compact command, 2^nd compaction and repair compensation-driven mechanisms compiling MongoDB, from source compound-key indexes, 2^nd $concat function $cond function config database config servers deployment of two-phase commit and config variable, 2^nd configdb option configsvr option configuration, basic options connecting MongoDB Ruby driver core server CouchDB (Apache document-based data store) count command count field count function .count( ) function count() command countsByCategory collection countsByRating variable covering indexes, query patterns and, 2^nd CPU, performance issues and createIndex() command, 2^nd createUser method CSV (Comma-Separated Values) curl utility currentOp() command, 2^nd cursor field, 2^nd cursor option cursor.explain() function cursor.forEach() function cursor.hasNext() function cursor.itcount() function cursor.map() function cursor.next() function cursor.pretty() function, 2^nd cursors BtreeCursor (explain output) MongoDB Ruby driver cursor.toArray() function custom import and export scripts

D

data centers, multiple with sharding data directory data imports and exports database commands, running from MongoDB Ruby driver database drivers databases allocating initial data files as data unit automatic creation of creating data files and allocation document databases listing managing MongoDB shell and others vs. MongoDB document databases relational databases simple key-value stores sophisticated key-value stores relational databases stats dataSize field date functions Date type $dayOfMonth function $dayOfWeek function $dayOfYear function db.collection.stats( ) function db.currentOp() method, 2^nd db.currentOp(true) command db.getReplicationInfo() method, 2^nd db.help() method db.isMaster() method, 2^nd dbpath does not exit (error message) dbPath option --dbpath option dbpath option db.runCommand({top:1}) command db.serverStatus() command db.spreadsheets.createIndex() command dbstats command, 2^nd db.stats() command, 2^nd Debian dedicated text search engines, vs. text search deeply nested documents defragmenting, indexes DELETE command deleteIndexes command deletes, 2^nd denormalizing data model deployment environment architecture clocks CPU disks file descriptors filesystems journaling locks RAM description field, 2^nd design patterns antipatterns bucket collections careless indexing large, deeply nested documents motley types one collection per user unshardable collections dynamic attributes embedding vs. referencing locality many-to-many relationships one-to-many relationships precomputation transactions trees worker queues details attribute, 2^nd diagnostics commands tools bsondump mongosniff mongostat mongotop web console. See monitoring. dictionary (Python primitive) --directoryperdb flag disks, performance issues and .distinct( ) function $divide function document data model document databases document updates modifying by operator modifying by replacement document-oriented data bulk inserts collections capped managing system collections time-to-live (TTL) collections databases data files and allocation managing documents limits on serialization, 2nd numeric types schema design principles string values virtual types. See also e-commerce data model, designing. documents advantages of, 2^nd as data unit example social news site entry inserting in Ruby lack of enforced schema limits on nested relation to agile development reshaping arithmetic functions date functions logical functions miscellaneous functions set operators string functions serialization dollar sign ($) Double type drivers how they work replication and connections and failover read scaling tagging write concern. See MongoDB Ruby driver. --drop flag drop() method, 2^nd drop_collection method dropDatabase() method dropDups option dropIndex() function, 2^nd dump directory duplicate key error durability dynamic attributes dynamic queries Dynamo

E

each iterator $each operator, 2^nd, 3^rd e-commerce e-commerce aggregation example product information summaries calculating average review counting reviews by rating joining collections $out operator $project operator $unwind operator user and order summaries finding best Manhattan customers summarizing sales by year and month e-commerce data model, designing product reviews schema basics many-to-many relationships nested documents one-to-many relationships relationship structure slugs users and orders, 2^nd e-commerce queries findone vs. find queries partial match queries in users products, categories, and reviews querying specific ranges skip, limit, and sort query options users and orders e-commerce updates average product ratings category hierarchy orders reviews Elasticsearch in Action (Gheorghe, Hinman and Russo) $elemMatch operator, 2^nd, 3^rd email attribute embedding, vs. referencing emit() function enablesharding command engine option engineConfig.cacheSize option engineConfig.journalCompressor option ensureIndex() function, 2^nd enterprise security features entity-attribute-value pattern $eq function error messages eventual consistency executionStats keyword, 2^nd, 3^rd $exists operator expireAfterSeconds setting explain() function, 2^nd, 3^rd, 4^th, 5^th, 6^th, 7^th, 8^th, 9^th output of viewing attempted query plans exports, data. See data imports and exports.

F

-f option facets failover, 2^nd Fedora fields option file descriptors files_id field fileSize field filesystems find method, 2^nd, 3^rd find queries, vs. findone queries find() command, 2^nd, 3^rd findAndModify command, 2^nd, 3^rd, 4^th, 5^th for implementing a queue implementing transactional semantics with findmnt command findOne method find_one method findone queries, vs. find queries findOne() function, 2^nd find_one() function $first function force option forEach function --fork option fork option FreeBSD FROM command from_mongo method fs.chunks collection fs.files collection, 2^nd

G

gem command generate_ancestors() method generation_time method $geoNear operator, 2^nd geospatial indexes getCmdLineOpts command getIndexes() method, 2^nd, 3^rd getIndexKeys() function getIndexSpecs() method getLastError command, 2^nd getLastErrorDefaults option getLastErrorModes getLastErrorModes option getSiblingDB() method global queries GNU-Affero General Public License. See AGPL. grantRolesToUser helper granularity, coarse greater than ($gte) operator grep command Grid object Grid#put method GridFS in Ruby with mongofiles GROUP BY clause, SQL GROUP BY command $group operator, 2^nd, 3^rd, 4^th, 5^th $gt (greater than) operator, 2^nd, 3^rd, 4^th $gte (greater than or equal) operator

H

halted replication hash (Ruby primitive) hashed indexes hashed shard keys HAVING command Hazard pointers --headerline flag heartbeat --help flag help() method hidden option hint() function, 2^nd, 3^rd history of MongoDB, 2^nd version 1.8.x version 2.0.x version 2.2.x version 2.4.x version 2.6.x version 3.0.x Homebrew horizontal scaling --host option host option hotspots $hour function

I

/i modifier i regex flag _id field, 2^nd, 3^rd, 4^th, 5^th, 6^th, 7^th, 8^th, 9^th, 10^th ifconfig command $ifNull function imbalanced writes imports, data. See data imports and exports. $in operator, 2^nd $inc operator, 2^nd, 3^rd, 4^th, 5^th, 6^th, 7^th, 8^th IN_CART state, 2^nd index locality indexBounds field indexConfig.prefixCompression option indexes administration of background indexing backing up book example B-trees building caution about building online compaction of compound-key indexes, 2^nd cookbook analogy, 2^nd, 3^rd core concepts compound-key indexes index efficiency single-key indexes covering indexes creating and deleting defragmenting efficiency issues, 2^nd ensureIndex() method getIndexes() method in sharded cluster maximum key size multikey indexes offline ordering of keys performance cost RAM requirements sharding and, 2^nd single-key, 2^nd sparse text search indexes assigning index name text index size types of geospatial indexes hashed indexes multikey indexes sparse indexes unique indexes unique indexes when to declare them write lock when building indexOnly field indexSizes field infix notation initialize method injection attacks insert() method, 2^nd insert_one function inserts, MongoDB shell and installation basic configuration options MongoDB on Linux installing with precompiled binaries using package manager MongoDB on Mac OS X precompiled binaries using package manager MongoDB on Windows MongoDB Ruby driver MongoDB versioning and on Linux on OS X on Windows Ruby troubleshooting lack of permissions nonexistent data directory unable to bind to port wrong architecture with Linux package managers with OS X package managers inventory management failure inventory fetcher InventoryFetcher InventoryFetchFailure exception iostat command irb shell isbn field isMaster command, 2^nd, 3^rd ISODate object $isolated operator it command itcount() function items array

J

j option JavaScript Object Notation. See JSON. JavaScript query operators JavaScript shell. See MongoDB shell. JavaScript type JOIN command joins, complexity of, 2^nd journal.enabled option journaling, 2^nd JSON (JavaScript Object Notation), 2^nd

K

key features of MongoDB ad hoc queries document data model indexes replication scaling speed and durability key file authentication --keyFile option key-value stores query model simple sophisticated use cases kill command, 2^nd KVEngine KVStorageEngine class

L

languages, text search available languages specifying in document specifying in index specifying in search large, deeply nested documents $last function less than ($lt) operator $let function licensing, core server $limit operator, 2^nd limit query option, 2^nd Linux installing MongoDB on installing with precompiled binaries using package manager installing Ruby on listDatabases command listshards command $literal function load distribution localhost exception locality :local_threshold option locking, 2^nd locks element --logappend option logging, 2^nd logical functions --logpath option logpath option, 2^nd logrotate command long polling longDescription field, 2^nd ls command LSM (log-structured merge-trees), 2^nd lsof command $lt (less than) operator, 2^nd, 3^rd $lte (less than or equal) operator, 2^nd, 3^rd

M

Mac OS X installing MongoDB on precompiled binaries using package manager installing Ruby on MacPorts mainCategorySummary collection man-in-the-middle attacks many-to-many relationships, 2^nd $map function map-reduce function, 2^nd master-slave replication, 2^nd $match operator, 2^nd, 3^rd, 4^th, 5^th, 6^th, 7^th, 8^th materialized views $max function max parameter maxBsonObjectSize field maxElement $maxElement field $maxKey, 2^nd Maxkey type McCreight, Ed :md5 MD5, storing Memcached $meta function $meta:"textScore" field metadata, storage of method chaining migration rounds millis field $millisecond function $min function $minElement field $minKey Minkey type $minute function mmap() function MMAPv1, WiredTiger compared with benchmark conclusion configuration files insertion benchmark results insertion script and benchmark script read performance results read performance scripts MMAPV1DatabaseCatalogEntry class MMAPV1Engine class MMS Automation MMS Monitoring, 2^nd $mod operator, 2^nd modifying document updates by operator by replacement mongo (executable), 2^nd mongo gem, 2^nd Mongo::Client constructor mongoconnector tool mongod (executable) MongoDB additional resources core server definition of design philosophy document-oriented data model history of, 2^nd version 1.8.x version 2.0.x version 2.2.x version 2.4.x version 2.6.x version 3.0.x installing on Linux installing with precompiled binaries using package manager installing on Mac OS X precompiled binaries using package manager installing on Windows key features of ad hoc queries document data model indexes replication scaling speed and durability open source status operating system support reasons for using tips and limitations tools command-line tools database drivers JavaScript shell uniqueness of data model use cases and production deployments agile development analytics and logging caching variable schemas web applications user’s manual vs. other databases document databases relational databases simple key-value stores sophisticated key-value stores with object-oriented languages. See also MongoDB shell. Mongo::DB class MongoDB Management System Automation. See MMS Automation. MongoDB Monitoring Service MongoDB Ruby driver database commands inserting documents in Ruby installing and connecting queries and cursors updates and deletes MongoDB shell administration commands getting database information collections databases deleting data documents help indexes explain( ) method range queries inserts and queries _id fields in MongoDB pass query predicate other shell features starting updating documents advanced updates operator update replacement update updating complex data MongoDB user groups mongod.lock file mongodump command mongodump utility, 2^nd, 3^rd mongoexport utility mongofiles utility, 2^nd Mongo::Grid::File object mongoimport utility, 2^nd Mongo::OperationFailure exception mongooplog utility mongoperf utility mongorestore utility, 2^nd, 3^rd mongos routers mongosniff utility, 2^nd mongostat utility, 2^nd, 3^rd mongotop utility, 2^nd monitoring external applications for logging MongoDB Monitoring Service. See also diagnostics. $month function, 2^nd motley types movechunk command moveprimary command msg field multi parameter multi: true parameter multidocument updates multikey indexes $multiply function Munin monitoring system MySQL, 2^nd, 3^rd

N

n integer Nagios monitoring system name attribute name field, 2^nd name parameter namespaces, 2^nd NASDAQ (example data set) $natural operator $ne (not equal to) operator, 2^nd nearest setting, MongoDB driver nested documents network encryption running MongoDB with SSL SSL in clusters new option next() function $nin (not in) operator noatime directive --nojournal flag nonexistent data directory --noprealloc option $nor operator normalization, 2^nd NoSQL not equal to ($ne) operator, 2^nd $not function not in ($nin) operator $not operator nReturned nscanned, 2^nd --nssize option NTP (Network Time Protocol) ntpd daemon Null type null value num key num_1 field NumberInt() function numbers collection, 2^nd, 3^rd numeric types

O

object IDs, generation of Object type offline indexing one collection per user one-to-many relationships, 2^nd op field operations, router of operators aggregation framework operators $group $limit $match $out $project $skip $sort $unwind array update operators modifying document updates by positional updates standard update operators oplog, querying manually oplog.rs collection, 2^nd --oplogSize option, mongod optimistic locking $options operator $or operator, 2^nd Oracle database order state transitions finishing order preparing order for checkout verifying order and authorization orders $out operator, 2^nd, 3^rd, 4^th

P

p method, Ruby padding factor paddingFactor field page faults pageCount field pagination parent_id attribute partial match queries in users path field pattern matching, vs. text search patterns, design. See design patterns. PCRE (Perl Compatible Regular Expressions) Percona performance troubleshooting performance cliff query interactions seeking professional assistance working set Perl Compatible Regular Expressions. See PCRE. permission denied (error message) permissions, lack of pluggable storage engines classes to deal with storage modules data structure examples of locking storage engine API poor targeting, 2^nd $pop operator, 2^nd --port flag port option ports, inability to bind to positional updates PostgreSQL post_id field, 2^nd precomputation prefix notation pretty() function, 2^nd primary key field. See _id fields. primary setting, MongoDB driver primaryPreferred setting, MongoDB driver priority option privileges product information summaries calculating average review counting reviews by rating joining collections $out operator $project operator $unwind operator product reviews. See reviews, product. product_id field production deployments. See use cases and production deployments. products collection, 2^nd programs, writing building simple application gathering data setting up viewing archive how drivers work MongoDB Ruby driver database commands inserting documents in Ruby installing and connecting queries and cursors updates and deletes $project operator, 2^nd, 3^rd, 4^th, 5^th, 6^th Project Voldemort projections provisioning cloud and Management System (MMS) Automation ps command publishedDate field $pull operator, 2^nd $pullAll operator, 2^nd, 3^rd $push operator, 2^nd, 3^rd, 4^th, 5^th, 6^th $pushAll operator, 2^nd

Q

queries, 2^nd e-commerce queries findone vs. find queries partial match queries in users products, categories, and reviews querying specific ranges skip, limit, and sort query options users and orders explain() method _id lookups matching sub-documents MongoDB Ruby driver MongoDB shell and _id fields in MongoDB pass query predicate object id reference lookups range ranges vs. updates query language, MongoDB’s query criteria and selectors arrays, 2nd Boolean operators JavaScript query operators matching subdocuments miscellaneous query operators, 2nd querying for an array by size querying for document with specific key ranges regular expressions, 2nd selector matching set operators, 2nd query options, 2^nd projections skip and limit sorting. See queries. query optimization, 2^nd common query patterns and indexes for query patterns compound-key indexes and covering indexes and single-key indexes and slow queries adding index and retrying explain( ) method identifying indexed key use MongoDB's query optimizer query plan cache showing query plans with compound-key indexes with single-key indexes query optimizer caching and expiring query plans internal, 2^nd running queries in parallel query selectors, 2^nd queryPlanner mode queues, implementing

R

RAM in-memory databases page size performance issues and range queries, optimizing indexes for ranges rating field ratingSummary variable :read parameter read role read scaling readWrite role RecordStore class recovery, from network partitions $redact operator, 2^nd reduce() function referencing, vs. embedding $regex operator Regex type regular expressions reIndex command reIndex() method rejectedPlans list relational databases relationships many-to-many, 2^nd one-to-many structure of releases, 2^nd remove method, 2^nd, 3^rd remove option removeshard command $rename operator, 2^nd renameCollection method repairDatabase command replacement, modifying document updates by replica sets administration configuration details deployment strategies failover and recovery replica set status and automated failover authentication key file authentication X509 authentication commits and rollback connecting to halted replication heartbeat and failover how failover works oplog capped collection overview setup sizing replication oplog tagging replication, 2^nd drivers and connections and failover read scaling tagging write concern failure modes it protects against importance of overview use cases and limitations. See also replica sets. --replSet flag replSetGetStatus command replSetInitiate command replset.minvalid replSetReconfig command reshaping documents arithmetic functions date functions logical functions miscellaneous functions set operators string functions REST interface rest option reviewing update operators reviews, product average review, calculating counting by rating revokeRolesFromUser helper Riak roles rollback rs.add() function, 2^nd rs.conf() method rs.help() command rs.initiate() command, 2^nd, 3^rd rs.reconfig() command, 2^nd rs.slaveOk() function rs.status() command, 2^nd, 3^rd, 4^th, 5^th Ruby GridFS in installing Ruby driver. See MongoDB Ruby driver. runCommand() method

S

–s option save() method, 2^nd save_tweets_for method scalability, as original design goal scaling. See also read scaling; sharding. scanAndOrder field, 2^nd, 3^rd scatter/gather queries schema design, principles of schema-less model, advantages of schemas, variable Scoped JavaScript type score attribute $search parameter secondary indexes secondary setting, MongoDB driver secondaryPreferred setting, MongoDB driver Secure Sockets Layer. See SSL. security authentication basic, setting up removing user service authentication user authentication enterprise security features network encryption running MongoDB with SSL SSL in clusters replica set authentication key file authentication X509 authentication secure environments sharding authentication SELECT command selectors, query arrays, 2^nd Boolean operators JavaScript query operators matching subdocuments miscellaneous query operators, 2^nd querying for an array by size querying for document with specific key ranges regular expressions, 2^nd selector matching set operators, 2^nd sequential vs. random writes serialize method serverStatus command, 2^nd, 3^rd service authentication $set operator, 2^nd, 3^rd, 4^th $setDifference function $setEquals function $setIntersection function $setIsSubset function $setOnInsert operator, 2^nd setProfilingLevel command $setUnion function sh helper object sh.addShard() command shard clusters backing up checking chunk distribution failover and recovery of querying and indexing, 2^nd unsharding a collection shard keys, examples of shardcollection command sharding, 2^nd, 3^rd across data centers authentication building sample shard cluster sharding collections starting mongod and mongos servers writing to sharded cluster checking which collections are sharded choosing shard key ideal shard keys imbalanced writes inherent design trade-offs poor targeting unsplittable chunks components of Mongos router shards storage of metadata distributing data in sharded cluster distributing databases to shards methods of sharding within collections estimating cluster size how it works in production deployment maintenance provisioning overview problem definition processes required production deployment techniques query types querying and indexing shard cluster aggregation in sharded cluster explain() tool in sharded cluster indexing in sharded cluster query routing sample deployment topologies when to use load distribution storage distribution shardsvr option shell. See MongoDB shell. sh.enableSharding() method sh.help() function sh.moveChunk() method shortDescription field, 2^nd sh.shardCollection() method sh.splitAt() method sh.status() method, 2^nd sh.stopBalancer() function siblings simple index simple key-value stores sinatra gem single nodes single point of failure. See SPOF. single-key indexes, 2^nd $size operator, 2^nd, 3^rd $skip operator, 2^nd skip option, 2^nd sku field, 2^nd slaveDelay option slaves collection Sleepycat Software $slice operator, 2^nd, 3^rd slow queries adding index and retrying explain( ) method identifying indexed key use MongoDB's query optimizer query plan cache showing query plans slowms flag slug field slugs --smallfiles option snappy compression algorithm snapshotting live systems sophisticated key-value stores $sort operator, 2^nd, 3^rd, 4^th, 5^th, 6^th, 7^th sort option, 2^nd sort() function sorting, optimizing indexes for, 2^nd, 3^rd sparse indexes sparse option speed split command SPOF (single point of failure) SQL, 2^nd SSL (Secure Sockets Layer) in clusters running MongoDB with --sslMode option --sslPEMKeyFile option Stack Overflow standard update operators state field, 2^nd state machines stateStr field stats() command, 2^nd, 3^rd, 4^th status field stemming, 2^nd, 3^rd Stirman, Kelly stop words storage distribution storage engines. See pluggable storage engines. storage, binary storing an MD5 storing thumbnails StorageEngine class storageSize field $strcasecmp function String (UTF-8) type string functions string values StringIO class subdocuments, matching in queries $substr function $subtract function $sum function, 2^nd, 3^rd Symbol type symlink (symbolic link) synonym libraries system collections system.indexes collection, 2^nd, 3^rd system.namespaces collection system.profile collection system.replset collection, 2^nd

T

table scans. See collection scans. tagging replica sets tags field tags option targeted queries targetedCustomers collection tcpdump command test database $text operator, 2^nd, 3^rd text search aggregation framework text search basic book catalog data download complex excluding documents with specific words or phrases specifications costs vs. benefits defining indexes assigning index name indexing all text fields in collection text index size languages available languages specifying in document specifying in index specifying in search scores simple example vs. dedicated text search engines vs. pattern matching vs. web page searches textSearchScore this keyword, 2^nd thrashing, 2^nd thread_id field thumbnails, storing thumbnailUrl field Time object, 2^nd time_field Timestamp type title field toArray() method TokuFT key-value store TokuMXse Pluggable Storage API $toLower function to_mongo method tools command-line tools database drivers JavaScript shell tools tag to_s method totalDocsExamined, 2^nd $toUpper function transaction logging. See journaling. transactions transition_state method, 2^nd trees category hierarchy example denormalized ancestor pattern representing threaded comments with troubleshooting, installation problems lack of permissions nonexistent data directory unable to bind to port wrong architecture. See also performance troubleshooting. ts field TTL (time-to-live) collections TweetArchiver class TWEETS constant tweets.erb file twitter gem Twitter, storing tweets $type operator types numeric types string values virtual types

U

Ubuntu ulimit comman unique indexes unique key $unset operator, 2^nd, 3^rd unshardable collections unsplittable chunks $unwind operator, 2^nd, 3^rd unzip utility update() method, 2^nd, 3^rd, 4^th, 5^th, 6^th update_many method updates atomicity by replacement vs. by operator concurrency findAndModify command isolation MongoDB Ruby driver operators array update operators positional updates standard update operators performance notes types and options multidocument updates upserts vs. queries. See also document updates. upgrading upsert option upsert: true parameter upserts, 2^nd use cases and production deployments agile development analytics and logging caching variable schemas web applications use command user authentication user groups, MongoDB user’s manual, MongoDB user_actions collection userAdminAnyDatabase user_id attribute user_id field, 2^nd, 3^rd username field, 2^nd, 3^rd, 4^th, 5^th users collection, 2^nd, 3^rd, 4^th, 5^th, 6^th

V

variable schemas versioning, 2^nd. See also releases. versions of MongoDB version 1.8.x version 2.0.x version 2.2.x version 2.4.x version 2.6.x version 3.0.x vertical scaling virtual types votes setting -vvvvv option

W

w parameter web applications, 2^nd web console tool web page searches, vs. text search $week function weight, for fields wget utility WHERE command $where operator, 2^nd wildcard field name Windows, installing MongoDB on WiredTiger migrating database to MMAPv1 compared with benchmark conclusion configuration files insertion benchmark results insertion script and benchmark script read performance results read performance scripts switching to wiredTiger option, MongoDB configuration file WiredTigerFactory class WiredTigerKVEngine class WiredTigerRecordStore class wiredtiger-snappy.conf file worker queues working data set write concern write speed wtimeout parameter

X

-x option X509 authentication

Y

$year function, 2^nd

Z

Zlib compression algorithm

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