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. Standard binary data type.






2. 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.






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






4. Returns the size of a document after it is converted to BSON from the JSON-like original.






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






6. Operator allowing the partial specification of fields in an embedded document in an array.






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






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






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






10. Returns help information for a command.






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






12. Renames a field from the one indicated to the new field name. ex: { $rename : { old_field_name : new_field_name } }






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






14. Less than or equal query conditional. ex: db.<col>.find({numVal: {$lte:3}});






15. command to start the mongo shell.






16. command to start the mongo shell.






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






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 },






19. Operator allowing the execution of arbitrary javascript as part of the selector.






20. Returns help information for a command.






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






22. Adds a document to a collection.






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






24. 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"}});






25. Binary-encoded serialization of mongo documents.






26. 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.






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






28. set of UTF-8 characters.






29. changes the database on which you are working.






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






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






32. 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.






33. ...






34. Query conditional allowing the selector to choose between more than one optional criteria.






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






36. Returns all the documents matching the optional properties.






37. command to start the mongodb process.






38. In BSON - represents the largest possible value.






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






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






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






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






43. 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 } }






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






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






46. Operator used in the second argument of the find() call to specify which slice of an array to return for an array field.






47. Stored as milliseconds since the epoch.






48. Meta query conditional used to negate the selector.






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






50. String of arbitrary bytes.