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Mongo Db

Subject : it-skills

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Answer 50 questions in 15 minutes.
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Match each statement with the correct term.
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This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.

1. String of arbitrary bytes.
binary data
$unset
undefined
db.<col>.remove({selector});

2. Clone the current database (implied by 'db') from another host.
Update Modifiers
db.help([commandName]);
db.cloneDatabase(fromhost)
boolean

3. Less than query conditional. ex: db.<col>.find({numVal: {$lt:3}});
db.commandHelp("commandName")
undefined
$lt
$unset

4. Array specific conditional used to select based on the length or set-size of an array field value.
$in
$size
use <database name>
minimum value

5. Operator used in the second argument of the find() call to specify which slice of an array to return for an array field.
maximum value
$slice
string
$not

6. Does not contain query conditional used to select documents with the field that is not in the selector list of values.
$elemMatch
$pull
db.myCollection.ensureIndex({keypattern},[{options}])
$nin

7. Clone the current database (implied by 'db') from another host.
regular expression
Object.bsonsize({document});
key.index
db.cloneDatabase(fromhost)

8. Set or list of values.
array
help
$push
db.cloneDatabase(fromhost)

9. set of UTF-8 characters.
string
db.myCollection.ensureIndex({keypattern},[{options}])
db.<collection>.find([properties]);
maximum value

10. Data structure used to store all other data in mongo databases.
document
db.cloneDatabase(fromhost)
db.cloneDatabase(fromhost)
maximum value

11. Operator allowing the partial specification of fields in an embedded document in an array.
use <database name>
db.commandHelp("commandName")
$
$elemMatch

12. Lists all the collections in the database in use.
show collections
db.<collection>.findOne([properties]);
$pullAll
maximum value

13. The local variable representation of a query. Uniquely - the cursor does not hold the results but instead access to the results.
Cursor
$mod
$unset
maximum value

14. Stored as milliseconds since the epoch.
date
$lt
$lte
db.cloneDatabase(fromhost)

15. Special keys passed in an update call to specify complex update operations - such as alter - adding - or removing keys - and even manipulating arrays and embedded documents.
Object.bsonsize({document});
$pushAll
db.help([commandName]);
Update Modifiers

16. The standard number representation in the javascript shell.
batch insert
64-bit floating point numbers
db.<col>.remove({selector});
db.<collection>.find([properties]);

17. Returns help information for a command.
db.cloneDatabase(fromhost)
64-Bit Integer
db.commandHelp("commandName")
mongod

18. Positional operator that holds the position of the first matched array item in the query. Used to find an array member and then manipulate it. ex: {$inc:{'comments.$.votes':1}} where comments looks like: "comments" : [ { "by" : "joe", "votes" : 3 },
$pull
db.runCommand({fsync:1,lock:1,async:1})
$
boolean

19. Not equal query conditional. ex: db.<col>.find({numVal: {$ne:3}});
key.index
$pushAll
64-bit floating point numbers
$ne

20. Standard javascript regular expressions. These can be stored in documents
db.<collection>.findOne([properties]);
regular expression
show collections
$inc

21. Standard binary data type.
$in
boolean
Multi-updates
$pullAll

22. In BSON - represents the largest possible value.
db.<col>.remove({selector});
db.getLastError()
Cursor
maximum value

23. Copies an entire database from one name on one server to another name on another server. Omit frmHostName to copy from one name to another on the same server.
$push
$size
object id
db.copyDatabase(frmDBName, toDBName, [frmHostName], [user], [pwd]);

24. Adds a document to a collection.
db.<collection>.insert({document});
db.getLastError()
$rename
db.commandHelp("commandName")

25. Returns all the documents matching the optional properties.
$pop
$where
mongo
db.<collection>.find([properties]);

26. Query conditional allowing the selector to choose between more than one optional criteria.
Multi-updates
mongod
$or
undefined

27. Updates all matching documents, not just the first, that match the selector.
mongod
$gt
Multi-updates
db.runCommand({fsync:1,lock:1,async:1})

28. Update modifier that set the value of a key and if the key does not exist, it will create the key. ex: db.<col>.update({selector},{"$set":{"someKey":"someValue"}});
use <database name>
mongo
$addToSet
$set

29. Syntax used for selectors to be specific to a certain element position within an array.
db.<col>.remove({selector});
key.index
object id
db.copyDatabase(frmDBName, toDBName, [frmHostName], [user], [pwd]);

30. Update call that inserts a new document if no update match is found. Allows the same code to be used for inserts as well as updates.
db.<collection>.insert({document});
Upsert
regular expression
mongod

31. Deletes documents from the collection based on the selector.
db.<col>.remove({selector});
mongo
mongod
db.<collection>.find([properties]);

32. Removes all occurrences of a value from a field. ex: { $pull : { field : _value } }
db.<collection>.find([properties]);
mongo
$pull
date

33. command to start the mongodb process.
code
mongod
key.index
$slice

34. changes the database on which you are working.
use <database name>
$slice
$where
db.<collection>.insert({document});

35. Returns the size of a document after it is converted to BSON from the JSON-like original.
object id
Object.bsonsize({document});
$set
use <database name>

36. Command to get help docs on a specific command at the db level.
$lt
db.<collection>.insert({document});
db.help([commandName]);
64-Bit Integer

37. Binary-encoded serialization of mongo documents.
$pull
BSON
db.<col>.remove({selector});
binary data

38. Deletes a given field. ex: { $unset : { field : 1} }
$unset
$in
use <database name>
db.myCollection.ensureIndex({keypattern},[{options}])

39. Operator allowing the execution of arbitrary javascript as part of the selector.
mongo
db.commandHelp("commandName")
$where
embedded document

40. command to start the mongo shell.
Upsert
$elemMatch
mongo
$lte

41. Greater than query conditional. ex: db.<col>.find({numVal: {$gt:3}});
null
db.myCollection.ensureIndex({keypattern},[{options}])
$gt
db.runCommand({fsync:1,lock:1,async:1})

42. Creates an index on property(s). Options can describe the type of sorting, uniqueness, etc.
db.myCollection.ensureIndex({keypattern},[{options}])
db.<collection>.find([properties]);
db.<col>.remove({selector});
db.<collection>.findOne([properties]);

43. Less than or equal query conditional. ex: db.<col>.find({numVal: {$lte:3}});
null
$lte
$set
regular expression

44. Appends each value in the value_array to the field - if field is an existing array. Otherwise - it sets the field to the array value_array - if field is not present ex: { $pushAll : { field : value_array } }
$in
string
db.<collection>.find([properties]);
$pushAll

45. Used to represent both a null value and a nonexistent field.
$size
Multi-updates
$set
null

46. Not supported by the javascript shell and are converted to 64-bit floating point numbers.
array
null
$where
32-Bit Integer

47. Returns information about the last operation. Not necessarily error data - the return can contain things like number of records updated.
$pull
db.getLastError()
$pushAll
$ne

48. Used to describe a variable as not having been initialized.
$gte
db.help([commandName]);
$mod
undefined

49. Javascript code. Documents can contain code as values.
string
code
$mod
undefined

50. Meta query conditional used to negate the selector.
embedded document
$pull
db.<col>.update({selector},{document});
$not

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Test your basic knowledge |

Mongo Db

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