1. 1 Copyright 2007 MySQL AB The World’s Most Popular Open Source Database MySQL Proxy WebTech 2007 Варна, България 29-ти Юни 2007 Aндрей Христов

2. 2 Copyright 2007 MySQL AB The World’s Most Popular Open Source Database Лекторът Андрей Христов работи за MySQL като разработчик в момента част от частта занимаваща с клиентските библиотеки автор на MySQL Event Scheduler, част от 5.1 (дипломна работа) бърка в кода на PHP oт години разработил почти изцяло mysqlnd поддържа ext/mysql и ext/mysqli заедно с Georg Richter... ще се опитам да отговоря на въпросите си - просто ги задайте! Ако сте срамежливи, ще ви очаквам след лекцията.... отговарям на, някои, писма изпратени до мен на andrey@mysql.com

3. 3 Copyright 2007 MySQL AB The World’s Most Popular Open Source Database Agenda Use cases Implementation Usage Lua scripting Next Steps

4. 4 Copyright 2007 MySQL AB The World’s Most Popular Open Source Database Proxy (lat. "proximus",...) a proxy is someone who executes something on behalf of someone else proxy-servers forward requests to servers and can: – transform – handle or – block them

5. 5 Copyright 2007 MySQL AB The World’s Most Popular Open Source Database History implemented in a weekend session in March 2007 designed to handle thousands of parallel connections (c10k) uses a embedded scripting language for customizations

6. 6 Copyright 2007 MySQL AB The World’s Most Popular Open Source Database Load Balancing load balancing distributes the load across several slaves SQF is default: – Shortest Queue First – send new connections to the server with the least number of open connections Other balancers via scripts

7. 7 Copyright 2007 MySQL AB The World’s Most Popular Open Source Database Fail Over dead hosts are detected taking out of load balancing for 2min uses custom load balancers to decide how to handle a dead host: – hot + standby – normal load balancing

8. 8 Copyright 2007 MySQL AB The World’s Most Popular Open Source Database Scripting proxy embeds LUA allows analyzing and manipulating packets: – Inspection – Rewriting – Blocking – Injection

9. 9 Copyright 2007 MySQL AB The World’s Most Popular Open Source Database Query rewriting Macro Packages (ls, cd, who,...) tagging queries with SQL_CACHE migrating table-names turn EXPLAIN UPDATE|DELETE into equivalent EXPLAIN SELECT

10. 10 Copyright 2007 MySQL AB The World’s Most Popular Open Source Database Query Injection SHOW SESSION STATUS around a Query EXPLAIN to track index usage logging all generated warnings Global Transaction IDs

11. 11 Copyright 2007 MySQL AB The World’s Most Popular Open Source Database Transparency goal is to be transparent to the application layer SHOW WARNINGS can be worked around with Query Injection SELECT USER() shows the connected user (the proxy, not the client) which can be corrected with result-set rewriting

12. 12 Copyright 2007 MySQL AB The World’s Most Popular Open Source Database Latency early tests via localhost same script run directly and through the proxy latency per mysql-packet: 0.4ms ping RTT on 1Gbit: 0.1ms

13. 13 Copyright 2007 MySQL AB The World’s Most Popular Open Source Database Connection Pooling reusing open connections between proxy and server reduces concurrency on the MySQL Server external connection pool for PHP routing of Queries

14. 14 Copyright 2007 MySQL AB The World’s Most Popular Open Source Database Statement routing split the query stream into reading and writing Queries READ s go to the slaves WRITE s and transactions to the master automatic scale-out sharding

15. 15 Copyright 2007 MySQL AB The World’s Most Popular Open Source Database Future Work Replication – Filtering – Routing – Manipulation Parallel Inserts Delayed Replication

16. 16 Copyright 2007 MySQL AB The World’s Most Popular Open Source Database Въпроси ? Ако ви е срам, пишете ми на електронната поща или ме попитайте след лекцията!