Test your basic knowledge |

Subject : it-skills
Instructions:
  • Answer 50 questions in 15 minutes.
  • If you are not ready to take this test, you can study here.
  • Match each statement with the correct term.
  • Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

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. In BSON - represents the largest possible value.






2. Command to get help docs on a specific command at the db level.






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






4. changes the database on which you are working.






5. Contains query conditional used to check if a value contains the field value.






6. Clone the current database (implied by 'db') from another host.






7. The standard number representation in the javascript shell.






8. Deletes a given field. ex: { $unset : { field : 1} }






9. Creates an index on property(s). Options can describe the type of sorting, uniqueness, etc.






10. Returns help information for a command.






11. Greater than or equal query conditional. ex: db.<col>.find({numVal: {$gte:3}});






12. Set or list of values.






13. Used to describe a variable as not having been initialized.






14. Standard javascript regular expressions. These can be stored in documents






15. 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 } }






16. Returns all the documents matching the optional properties.






17. Not supported by the javascript shell and are converted to 64-bit floating point numbers.






18. Command to list commands and descriptions of those commands in the context of the database.






19. The local variable representation of a query. Uniquely - the cursor does not hold the results but instead access to the results.






20. Standard binary data type.






21. A document contained by a parent document. The embedded document is a value of a key in the parent document.






22. Clone the current database (implied by 'db') from another host.






23. Javascript code. Documents can contain code as values.






24. Removes all occurrences of a value from a field. ex: { $pull : { field : _value } }






25. Removes all occurrences of each value in the passed in array from the field. ex: { $pullAll : { field : value_array } }






26. Update modifier used to increment a value. ex: {"$inc":{"counter":2}}






27. Not supported by the javascript shell and are converted to 64-bit floating point numbers.






28. 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 } }






29. 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"}});






30. set of UTF-8 characters.






31. Returns help information for a command.






32. Syntax used for selectors to be specific to a certain element position within an array.






33. Array specific conditional used to select based on the length or set-size of an array field value.






34. 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.






35. Less than query conditional. ex: db.<col>.find({numVal: {$lt:3}});






36. Lists all the collections in the database in use.






37. Stored as milliseconds since the epoch.






38. 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.






39. Appends a value to field - if the field is an existing array. Otherwise it sets the field to the array [value] if field is not present. ex: { $push : { field : value } }






40. Returns information about the last operation. Not necessarily error data - the return can contain things like number of records updated.






41. Data structure used to store all other data in mongo databases.






42. Not equal query conditional. ex: db.<col>.find({numVal: {$ne:3}});






43. Command to get help docs on a specific command at the collection level.






44. Array specific conditional allowing matching on multiple elements within an array. The operation is non strict on the sequence of the values in the passed selector array.






45. Adds a document to a collection.






46. Flushes all pending writes to data files. The lock option allows one to safely snapshot the database's data files. The async option returns focus to the console immediately while the task runs in the background.






47. 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.






48. command to start the mongodb process.






49. 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 },






50. Does not contain query conditional used to select documents with the field that is not in the selector list of values.