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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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1. Returns one document matching the optional properties.
db.help([commandName]);
db.<collection>.find([properties]);
$push
db.<collection>.findOne([properties]);

2. Returns information about the last operation. Not necessarily error data - the return can contain things like number of records updated.
db.getLastError()
$push
mongo
db.<col>.remove({selector});

3. 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.
null
Upsert
$gt
use <database name>

4. 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.
$inc
array
db.<collection>.insert({document});
Update Modifiers

5. The local variable representation of a query. Uniquely - the cursor does not hold the results but instead access to the results.
$pushAll
minimum value
date
Cursor

6. Update a document in the collection.
db.<col>.update({selector},{document});
$in
db.<col>.remove({selector});
Cursor

7. Returns all the documents matching the optional properties.
db.<collection>.find([properties]);
$unset
use <database name>
binary data

8. Returns the size of a document after it is converted to BSON from the JSON-like original.
$pull
Object.bsonsize({document});
$unset
show collections

9. Operator used in the second argument of the find() call to specify which slice of an array to return for an array field.
Multi-updates
document
$slice
db.help([commandName]);

10. Clone the current database (implied by 'db') from another host.
minimum value
32-Bit Integer
use <database name>
db.cloneDatabase(fromhost)

11. Not equal query conditional. ex: db.<col>.find({numVal: {$ne:3}});
db.<collection>.insert({document});
$push
$ne
batch insert

12. Command to list commands and descriptions of those commands in the context of the database.
object id
help
$lt
show collections

13. 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 } }
$pushAll
$pop
minimum value
db.<collection>.findOne([properties]);

14. set of UTF-8 characters.
$gt
mongod
$set
string

15. Set or list of values.
db.<collection>.findOne([properties]);
use <database name>
$gte
array

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 } }
$pop
db.runCommand({fsync:1,lock:1,async:1})
$gt
$pushAll

17. Returns all the documents matching the optional properties.
$not
db.<collection>.find([properties]);
db.myCollection.ensureIndex({keypattern},[{options}])
db.commandHelp("commandName")

18. Adds a document to a collection.
undefined
$push
boolean
db.<collection>.insert({document});

19. Used to describe a variable as not having been initialized.
mongo
undefined
db.<col>.help([commandName]);
show collections

20. command to start the mongodb process.
db.cloneDatabase(fromhost)
document
$lt
mongod

21. Removes all occurrences of a value from a field. ex: { $pull : { field : _value } }
$pull
$
mongod
db.<collection>.insert({document});

22. 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 },
$
db.<collection>.insert({document});
undefined
Object.bsonsize({document});

23. Not supported by the javascript shell and are converted to 64-bit floating point numbers.
help
$not
64-Bit Integer
$gt

24. A document contained by a parent document. The embedded document is a value of a key in the parent document.
$inc
db.help([commandName]);
db.getLastError()
embedded document

25. Data structure used to store all other data in mongo databases.
db.<collection>.find([properties]);
$pull
$pushAll
document

26. Deletes documents from the collection based on the selector.
db.<col>.help([commandName]);
$set
$mod
db.<col>.remove({selector});

27. 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.
db.commandHelp("commandName")
db.copyDatabase(frmDBName, toDBName, [frmHostName], [user], [pwd]);
db.runCommand({fsync:1,lock:1,async:1})
use <database name>

28. Query conditional allowing the selector to choose between more than one optional criteria.
$size
32-Bit Integer
mongod
$or

29. changes the database on which you are working.
db.commandHelp("commandName")
Upsert
db.<collection>.find([properties]);
use <database name>

30. The standard number representation in the javascript shell.
db.<col>.update({selector},{document});
mongod
64-bit floating point numbers
Object.bsonsize({document});

31. 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 ] } } }
$all
$addToSet
db.<col>.remove({selector});
db.myCollection.ensureIndex({keypattern},[{options}])

32. Updates all matching documents, not just the first, that match the selector.
Multi-updates
minimum value
mongod
db.<collection>.insert({document});

33. Does not contain query conditional used to select documents with the field that is not in the selector list of values.
$nin
date
64-bit floating point numbers
64-Bit Integer

34. Javascript code. Documents can contain code as values.
code
Upsert
db.help([commandName]);
minimum value

35. 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.
BSON
Upsert
$mod
mongo

36. Used to represent both a null value and a nonexistent field.
$pushAll
null
db.commandHelp("commandName")
$rename

37. Standard javascript regular expressions. These can be stored in documents
undefined
regular expression
$unset
string

38. Meta query conditional used to negate the selector.
$or
$not
date
$rename

39. Operator allowing the execution of arbitrary javascript as part of the selector.
db.<collection>.find([properties]);
$where
db.cloneDatabase(fromhost)
$gte

40. command to start the mongo shell.
Update Modifiers
mongo
db.<collection>.find([properties]);
$rename

41. changes the database on which you are working.
db.copyDatabase(frmDBName, toDBName, [frmHostName], [user], [pwd]);
use <database name>
BSON
$slice

42. Less than query conditional. ex: db.<col>.find({numVal: {$lt:3}});
$lt
$set
db.<collection>.findOne([properties]);
db.<col>.remove({selector});

43. In BSON - represents the smallest possible value.
Cursor
$nin
$gt
minimum value

44. Command to get help docs on a specific command at the db level.
db.help([commandName]);
db.myCollection.ensureIndex({keypattern},[{options}])
db.<col>.remove({selector});
string

45. Command to get help docs on a specific command at the collection level.
db.<col>.help([commandName]);
mongo
$pop
db.<col>.remove({selector});

46. Standard binary data type.
boolean
embedded document
$rename
db.commandHelp("commandName")

47. Not supported by the javascript shell and are converted to 64-bit floating point numbers.
boolean
32-Bit Integer
$unset
undefined

48. Unique 12-byte ID for documents.
boolean
object id
db.copyDatabase(frmDBName, toDBName, [frmHostName], [user], [pwd]);
$

49. Clone the current database (implied by 'db') from another host.
Multi-updates
db.cloneDatabase(fromhost)
undefined
db.<col>.help([commandName]);

50. Syntax used for selectors to be specific to a certain element position within an array.
$gte
Upsert
mongod
key.index

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Test your basic knowledge |

Mongo Db

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