Undo statistics optimize the undo tablespace. Undo tablespaces—useful? Who receives undo tablespace statistics is unknown. Oracle 11g is restrictive.
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Undo statistics optimize the undo tablespace. Undo tablespaces—useful? Who receives undo tablespace statistics is unknown. Oracle 11g is restrictive.
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- Create a Client class that interacts with an SQLDatabase Server (provided below). The Client sends a SQLQuery to the SQLDatabase and receives a Dataframe from the SQLDatabase. The class should contain the default __dunders__ and potentially introduce some custom __dunders__. The SQLDatabase Server: import pandas as pd import sqlite3 class Server: def __init__(self, database): self.conn = sqlite3.connect(database) def __enter__(self): return self def __exit__(self, exc_type, exc_val, exc_tb): self.conn.close() def __repr__(self): return f"Server({self.conn})" def execute_query(self, query): cursor = self.conn.cursor() cursor.execute(query) columns = [desc[0] for desc in cursor.description] results = cursor.fetchall() df = pd.DataFrame(results, columns=columns) cursor.close() return df2. load_friendsdb This function does the reverse of save_friendsdb -- it takes a single argument, filename, and opens that specified file for reading. Then it reads the file one line at a time and creates a new friends database to return. Like in the previous function, each line will contain a friend's name followed by a tab, then the friend's height, and then a newline. Sample calls should look like this: >>> load friendsdb("friendsdb.tsv") [{'name': ' bimmy', 'height': 600}, {'name': 'Ian Donald Calvin Euclid Zappa', height': 175}]2. load_friendsdb This function does the reverse of save_friendsdb -- it takes a single argument, filename, and opens that specified file for reading. Then it reads the file one line at a time and creates a new friends database to return. Like in the previous function, each line will contain a friend's name followed by a tab, then the friend's height, and then a newline. Sample calls should look like this: >>> load_friendsdb("friendsdb.tsv") [{'name': ' bimmy', 'height': 600}, {'name': Ian Donald Calvin Euclid Zappa', height': 175}]
- What is the use of the –Unique parameter and sort-object in the below script? Get-CimClass -ClassName * -QualifierName * | Select-Object - ExpandProperty Ci mClassQualifiers | Select-Object Name -Unique | Sort-Object Name#Fill in comments to spec. import sqlite3from contextlib import closing from Objects import Player, Lineup conn = None def connect():global connif not conn:DB_FILE = "player_db.sqlite"conn = sqlite3.connect(DB_FILE)conn.row_factory = sqlite3.Row def close():if conn:conn.close() def get_players():return None #remove this line when code is added.# SQL statement to select all 7 fields for all players # Use a with statement to execute the query # Create a lineup object# use a loop to populate the lineup object with player objects# return the lineup object def get_player(playerID):return None #remove this line when code is added.# SQL statement to select all 7 fields for a player # Use a with statement to execute the query & return a player object if the player exists def add_player(player):return None #remove this line when code is added.# SQL statement to insert 6 fields for a player added to the table # Use a with statement to execute the query def delete_player(player):return None…KeyError Traceback (most recent call last) File ~\Anaconda3\lib\site-packages\pandas\core\indexes\base.py:3621, in Index.get_loc(self, key, method, tolerance) 3620 try: -> 3621 return self._engine.get_loc(casted_key) 3622 except KeyError as err: File ~\Anaconda3\lib\site-packages\pandas\_libs\index.pyx:136, in pandas._libs.index.IndexEngine.get_loc() File ~\Anaconda3\lib\site-packages\pandas\_libs\index.pyx:163, in pandas._libs.index.IndexEngine.get_loc() File pandas\_libs\hashtable_class_helper.pxi:5198, in pandas._libs.hashtable.PyObjectHashTable.get_item() File pandas\_libs\hashtable_class_helper.pxi:5206, in pandas._libs.hashtable.PyObjectHashTable.get_item() KeyError: 'Year' The above exception was the direct cause of the following exception: KeyError Traceback (most recent call last) Input In [46], in <cell line: 1>() ----> 1 get_year_pop('Aruba') Input In [45], in get_year_pop(country_name) 7 df = df[df['Country Name'] == country_name] 8 # Select only the 'Year' and…
- on 12 When database version in SQLite database is decreased then helper class will call et red O a. onCreate() d out of O b. onDowngrade() g question O c. onUpgrade() O d. onClose()tion 16 The helper class method called when you need to update data in database table is ret ered O a. getCreateableDatabase() ed out of O b. getWritableDatabase() ag question O c. none of these O d. getUpdateableDatabase()Open your text editor and create a new document named model.php model.php will contain functions that will connect to a database potentially return PDO statementobjects to the controller for processing. updateMessagesfunction updateMessages($id)This method will take a single parameter of id which is the saved id from the last or latest message displayed. It will conditionally select from the table “messages”, id, name, message, and time. The condition is that the field id is greater than the parameter for id. The return is the PDOStatement object with the row data from the query.
- Write a script that creates and calls a stored function named TotalOrders that calculates the total number of orders in the orders table. To do that, this function should not accept any parameter, and it should return the total number of orders in the orders table. Call the function from an anonymous block. Add SQL statement(s) that will display current date and your name and student ID in the format specified below. Your anonymous block must include exception handling.The file transactions.txt contains rows of transactions. Each transaction (row) consists of a start month,end month and name. Each of these three values is a String.In the following tasks you are asked to read and store the transactions from the file and determine if thereare any duplicate transactions. A transaction is a duplicate if all three values are the same as the threevalues of any other transaction.a. add code to your main method that reads the content of transactions.txt and stores itin a two-dimensional String array. The name of the String array is your choice. Note that you maynot assume that the number of rows in transactions.txt will always be the same. However, youmay assume that there will always be three String values on a single row. The first dimension of yourtwo-dimensional array must be resized dynamically each time a new record is read (Hint: we did thisin class with a single dimensional array and this is very, very similar). Your code will be evaluatedwith rows…in Mongo DB We want to add some students to our collection, but this time, we define the value for the _id field. (If the _id is not defined in your document, it will be added automatically.) _id: 1001 first_name: Sarah last_name: Stone email: s_stone@email.com city: Toronto status: full-time gpa: 3.4 program: CPA _id: 1002 first_name: Jack last_name: Adam email: j_adam@email.com city: North York status: part-time gpa: 3.6 program: CPA To add these students, we want to store these documents into a variable first. Define a variable named starray and add these two document to the variable. (You are storing more than one document so you need to define an array.) write the command to define the array: Now, use the starray array to insert the documents to your collection student. Write your insert statement: