making it ideal for long polling, WebSockets, and other applications that require a long-lived connection to each user. CONTENTS 1Tornado Documentation, Release 6.5.1 2 CONTENTSCHAPTER ONE QUICK LINKS making it ideal for long polling, WebSockets, and other applications that require a long-lived connection to each user. Tornado can be roughly divided into three major components: • A web framework (including 1.2 Asynchronous and non-Blocking I/O Real-time web features require a long-lived mostly-idle connection per user. In a traditional synchronous web server, this implies devoting one thread to each user

WebSockets [https://en.wikipedia.org/wiki/WebSocket], and other applications that require a long-lived connection to each user. Quick links Current version: 6.5.1 (download from PyPI [https://pypi.python.org/pypi/tornado] httpclient — Asynchronous HTTP client tornado.httputil — Manipulate HTTP headers and URLs tornado.http1connection – HTTP/1.x client/server implementation Asynchronous networking tornado.ioloop — Main event loop non-blocking socketstornado.netutil — Miscellaneous network utilities tornado.tcpclient — IOStream connection factory tornado.tcpserver — Basic IOStream-based TCP server Coroutines and concurrency tornado

· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 351 4.4.4 Connection Pools and Connection Parameters· · · · · · · · · · · · · · · · · · · · · · 354 4.5 Design Database Schema machine, update the software version: tiup update --self && tiup update cluster 5. Increase the connection limit of the sshd service using the root user privilege. This is because TiUP needs to simulate compatible with the MySQL protocol and supports most MySQL syn- tax and features, so most MySQL connection libraries are compatible with TiDB. If your application framework or language does not have an

· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 346 4.4.4 Connection Pools and Connection Parameters· · · · · · · · · · · · · · · · · · · · · · 349 4.5 Design Database Schema machine, update the software version: tiup update --self && tiup update cluster 5. Increase the connection limit of the sshd service using the root user privilege. This is because TiUP needs to simulate compatible with the MySQL protocol and supports most MySQL syn- tax and features, so most MySQL connection libraries are compatible with TiDB. If your application framework or language does not have an

· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 321 4.4.4 Connection Pools and Connection Parameters· · · · · · · · · · · · · · · · · · · · · · 324 4.5 Design Database Schema v8.2.0, TiProxy evaluates and ranks TiDB nodes based on various �→ dimensions, such as status, connection counts, health, memory, CPU, �→ and location. According to the load balancing policy specified proxy component of TiDB, located between the client and TiDB server. It provides load balancing and connection persistence functions for TiDB. Before v8.2.0, TiProxy defaults to v1.0.0, which only supports

· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 324 4.4.4 Connection Pools and Connection Parameters· · · · · · · · · · · · · · · · · · · · · · 327 4.5 Design Database Schema issue that the Connection Count monitoring metric in Grafana is incorrect 60 when some connections exit before the handshake is complete #54428 @YangKeao • Fix the issue that the Connection Count of each machine, update the software version: tiup update --self && tiup update cluster 5. Increase the connection limit of the sshd service using the root user privilege. This is because TiUP needs to simulate

· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 321 4.4.4 Connection Pools and Connection Parameters· · · · · · · · · · · · · · · · · · · · · · 324 4.5 Design Database Schema #51675 @lcwangchao • Fix the incorrect calculation and display of the number of connections (Connection Count) on the TiDB Dashboard Monitoring page #51889 @YangKeao • Fix the issue that the status machine, update the software version: tiup update --self && tiup update cluster 5. Increase the connection limit of the sshd service using the root user privilege. This is because TiUP needs to simulate

规范的接口，这个规范是 PEP 249。 要使用这个模块，必须先创建一个Connection 对象，它代表数据库。下面例子中，数据将存储在 example. db 文件中： import sqlite3 conn = sqlite3.connect('example.db') 你也可以使用 :memory: 来创建一个内存中的数据库 当有了Connection 对象后，你可以创建一个Cursor 游标对象，然后调用它的execute() ('2006-01-05','BUY','RHAT',100,35.14)") # Save (commit) the changes conn.commit() # We can also close the connection if we are done with it. # Just be sure any changes have been committed or they will be lost. conn check_same_thread, factory, cached_statements]) Opens a connection to the SQLite database file database. You can use ":memory:" to open a database connection to a database that resides in RAM instead of on disk

规范的接口，这个规范是 PEP 249。 要使用这个模块，必须先创建一个Connection 对象，它代表数据库。下面例子中，数据将存储在 example. db 文件中： import sqlite3 conn = sqlite3.connect('example.db') 你也可以使用 :memory: 来创建一个内存中的数据库 当有了Connection 对象后，你可以创建一个Cursor 游标对象，然后调用它的execute() ('2006-01-05','BUY','RHAT',100,35.14)") # Save (commit) the changes conn.commit() # We can also close the connection if we are done with it. # Just be sure any changes have been committed or they will be lost. conn check_same_thread, factory, cached_statements]) Opens a connection to the SQLite database file database. You can use ":memory:" to open a database connection to a database that resides in RAM instead of on disk

规范的接口，这个规范是 PEP 249。 要使用这个模块，必须先创建一个Connection 对象，它代表数据库。下面例子中，数据将存储在 example. db 文件中： import sqlite3 conn = sqlite3.connect('example.db') 你也可以使用 :memory: 来创建一个内存中的数据库 当有了Connection 对象后，你可以创建一个Cursor 游标对象，然后调用它的execute() ('2006-01-05','BUY','RHAT',100,35.14)") # Save (commit) the changes conn.commit() # We can also close the connection if we are done with it. # Just be sure any changes have been committed or they will be lost. conn check_same_thread, factory, cached_statements]) Opens a connection to the SQLite database file database. You can use ":memory:" to open a database connection to a database that resides in RAM instead of on disk