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Mongo Db

Subject : it-skills

Instructions:

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. set of UTF-8 characters.
string
Object.bsonsize({document});
$slice
mongo

2. 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.
Upsert
db.copyDatabase(frmDBName, toDBName, [frmHostName], [user], [pwd]);
db.<collection>.findOne([properties]);
db.<col>.help([commandName]);

3. Returns help information for a command.
$gt
db.commandHelp("commandName")
maximum value
mongod

4. Operator used in the second argument of the find() call to specify which slice of an array to return for an array field.
key.index
$not
$slice
$elemMatch

5. 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 },
mongod
db.getLastError()
Object.bsonsize({document});
$

6. Renames a field from the one indicated to the new field name. ex: { $rename : { old_field_name : new_field_name } }
$rename
BSON
$mod
db.commandHelp("commandName")

7. Returns help information for a command.
$addToSet
db.commandHelp("commandName")
BSON
$gte

8. Adds a value to the array only if its not in the array already. Otherwise, if the field is not present, it sets the field to the array value. ex: { $addToSet : { a : { $each : [ 3 , 5 , 6 ] } } }
Upsert
$addToSet
$lte
$or

9. Used to represent both a null value and a nonexistent field.
$lt
null
$all
db.getLastError()

10. Command to get help docs on a specific command at the collection level.
binary data
db.<col>.help([commandName]);
undefined
$all

11. Set or list of values.
$nin
db.myCollection.ensureIndex({keypattern},[{options}])
BSON
array

12. Removes all occurrences of each value in the passed in array from the field. ex: { $pullAll : { field : value_array } }
db.commandHelp("commandName")
string
show collections
$pullAll

13. In BSON - represents the smallest possible value.
db.<collection>.findOne([properties]);
Update Modifiers
minimum value
use <database name>

14. Array specific conditional used to select based on the length or set-size of an array field value.
db.runCommand({fsync:1,lock:1,async:1})
$size
undefined
mongod

15. In BSON - represents the largest possible value.
maximum value
mongo
db.copyDatabase(frmDBName, toDBName, [frmHostName], [user], [pwd]);
string

16. 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 } }
$pushAll
$ne
$pull
$unset

17. Not supported by the javascript shell and are converted to 64-bit floating point numbers.
Upsert
32-Bit Integer
db.runCommand({fsync:1,lock:1,async:1})
db.getLastError()

18. Meta query conditional generating a modulus with the selector operand. Checks to see if the field value when divided by one value has the remainder of the second value.
$ne
Cursor
show collections
$mod

19. Removes an element from an array based on the value of the field option being 1 or -1 for last or first element respectively. ex: { $pop : { field : -1 } }
$pop
string
Update Modifiers
db.help([commandName]);

20. Returns one document matching the optional properties.
db.<collection>.findOne([properties]);
db.<col>.update({selector},{document});
Upsert
maximum value

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

22. Syntax used for selectors to be specific to a certain element position within an array.
db.runCommand({fsync:1,lock:1,async:1})
maximum value
key.index
$gte

23. Unique 12-byte ID for documents.
$size
Cursor
$pushAll
object id

24. Adds a document to a collection.
regular expression
use <database name>
db.<collection>.insert({document});
$

25. Used to describe a variable as not having been initialized.
undefined
db.<col>.help([commandName]);
use <database name>
mongod

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

27. Not equal query conditional. ex: db.<col>.find({numVal: {$ne:3}});
binary data
Upsert
$ne
$or

28. Adds a document to a collection.
key.index
db.<collection>.insert({document});
db.cloneDatabase(fromhost)
document

29. command to start the mongo shell.
$set
mongo
mongod
Update Modifiers

30. Lists all the collections in the database in use.
db.runCommand({fsync:1,lock:1,async:1})
show collections
minimum value
embedded document

31. Returns all the documents matching the optional properties.
db.<collection>.find([properties]);
db.commandHelp("commandName")
boolean
$ne

32. Greater than or equal query conditional. ex: db.<col>.find({numVal: {$gte:3}});
$gte
$lt
db.runCommand({fsync:1,lock:1,async:1})
64-Bit Integer

33. Operator allowing the execution of arbitrary javascript as part of the selector.
undefined
db.getLastError()
$where
$set

34. Deletes a given field. ex: { $unset : { field : 1} }
$gt
$size
$unset
key.index

35. The local variable representation of a query. Uniquely - the cursor does not hold the results but instead access to the results.
$size
Cursor
db.<col>.help([commandName]);
$push

36. Operator allowing the partial specification of fields in an embedded document in an array.
$elemMatch
object id
Cursor
mongo

37. Clone the current database (implied by 'db') from another host.
$pop
db.cloneDatabase(fromhost)
64-Bit Integer
$elemMatch

38. String of arbitrary bytes.
db.<collection>.insert({document});
help
string
binary data

39. Less than or equal query conditional. ex: db.<col>.find({numVal: {$lte:3}});
mongo
$lte
key.index
db.<collection>.insert({document});

40. Not supported by the javascript shell and are converted to 64-bit floating point numbers.
64-Bit Integer
db.getLastError()
$
mongod

41. Update a document in the collection.
maximum value
db.<col>.update({selector},{document});
BSON
$lte

42. Standard binary data type.
minimum value
$lte
Object.bsonsize({document});
boolean

43. changes the database on which you are working.
minimum value
db.<col>.remove({selector});
use <database name>
$in

44. 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.
$unset
regular expression
Update Modifiers
$lt

45. Query conditional allowing the selector to choose between more than one optional criteria.
$or
object id
64-bit floating point numbers
db.<col>.remove({selector});

46. Removes all occurrences of a value from a field. ex: { $pull : { field : _value } }
boolean
$pull
document
$in

47. Stored as milliseconds since the epoch.
$gte
show collections
db.<col>.remove({selector});
date

48. Greater than query conditional. ex: db.<col>.find({numVal: {$gt:3}});
$gt
$gte
mongod
date

49. 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.
object id
$where
db.copyDatabase(frmDBName, toDBName, [frmHostName], [user], [pwd]);
db.myCollection.ensureIndex({keypattern},[{options}])

50. A document contained by a parent document. The embedded document is a value of a key in the parent document.
embedded document
db.<col>.remove({selector});
db.<collection>.insert({document});
boolean

Can you answer 50 questions in 15 minutes?

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Mongo Db

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