High-Performance Java Persistence – Part One
Imagine having a tool that can automatically detect JPA and Hibernate performance issues. Hypersistence Optimizer is that tool!
Four months, one week and two days and 114 pages; that’s how much it took to write the first part of the High-Performance Java Persistence book.
As previously stated, the book is developed in an Agile fashion. Each part represents a milestone, which is accompanied by a release. This way, the readers can get access to the book content prior to finishing the whole book (which might take a year or so).
Table of content
Before explaining what this first part is all about, it’s better to take a look on its table of content:
1. Preface 1.1 The database server and the connectivity layer 1.2 The application data access layer 1.2.1 The ORM framework 1.2.2 The native query builder framework 2. Performance and Scaling 2.1 Response time and Throughput 2.2 Database connections boundaries 2.3 Scaling up and scaling out 2.3.1 Master-Slave replication 2.3.2 Multi-Master replication 2.3.3 Sharding 3. JDBC Connection Management 3.1 DriverManager 3.2 DataSource 3.2.1 Why is pooling so much faster? 3.3 Queuing theory capacity planning 3.4 Practical database connection provisioning 3.4.1 A real-life connection pool monitoring example 22.214.171.124 Concurrent connection request count metric 126.96.36.199 Concurrent connection count metric 188.8.131.52 Maximum pool size metric 184.108.40.206 Connection acquisition time metric 220.127.116.11 Retry attempts metric 18.104.22.168 Overall connection acquisition time metric 22.214.171.124 Connection lease time metric 4. Batch Updates 4.1 Batching Statements 4.2 Batching PreparedStatements 4.2.1 Choosing the right batch size 4.2.2 Bulk operations 4.3 Retrieving auto-generated keys 4.3.1 Sequences to the rescue 5. Statement Caching 5.1 Statement lifecycle 5.1.1 Parser 5.1.2 Optimizer 126.96.36.199 Execution plan visualization 5.1.3 Executor 5.2 Caching performance gain 5.3 Server-side statement caching 5.3.1 Bind-sensitive execution plans 5.4 Client-side statement caching 6. ResultSet Fetching 6.1 ResultSet scrollability 6.2 ResultSet changeability 6.3 ResultSet holdability 6.4 Fetching size 6.5 ResultSet size 6.5.1 Too many rows 188.8.131.52 SQL limit clause 184.108.40.206 JDBC max rows 220.127.116.11 Less is more 6.5.2 Too many columns 7. Transactions 7.1 Atomicity 7.2 Consistency 7.3 Isolation 7.3.1 Concurrency control 18.104.22.168 Two-phase locking 22.214.171.124 Multi-Version Concurrency Control 7.3.2 Phenomena 126.96.36.199 Dirty write 188.8.131.52 Dirty read 184.108.40.206 Non-repeatable read 220.127.116.11 Phantom read 18.104.22.168 Read skew 22.214.171.124 Write skew 126.96.36.199 Lost update 7.3.3 Isolation levels 188.8.131.52 Read Uncommitted 184.108.40.206 Read Committed 220.127.116.11 Repeatable Read 18.104.22.168 Serializable 7.4 Durability 7.5 Read-only transactions 7.5.1 Read-only transaction routing 7.6 Transaction boundaries 7.6.1 Distributed transactions 22.214.171.124 Two-phase commit 7.6.2 Declarative transactions 7.7 Application-level transactions 7.7.1 Pessimistic and optimistic locking 126.96.36.199 Pessimistic locking 188.8.131.52 Optimistic locking
The first part is about closing the gap between an application developer and a database administrator. This book focused on data access, and for this purpose, it explains the inner-workings of both the database engine and the JDBC drivers of the four most common relational databases (Oracle, SQL Server, MySQL, and PostgreSQL).
I explain what performance and scalability means and the thin relation between response time and throughput.
Being a big fan of Neil J. Gunther, I couldn’t not write about the Universal Scalability Law and how this equation manages to associate capacity with contention and coherency.
From hardware to distributed systems, queues are everywhere, and Queuing theory provides an invaluable equation for understanding how queues affect throughput.
Connection management is one area where queuing plays a very important role and monitoring connection usage is of paramount importance to providing responsive and scalable services.
Like any other client-server communication, the data access layer can benefit from batching requests. Database drivers, like other database-related topics, are very specific when it comes to batching statements. For this purpose, I explained how you can leverage batching based on the database system in use.
Statement caching is very important for high-performance enterprise applications, both on the server-side and the client-side. This book explains how statement caching is implemented in the most common RDBMS and how you can activate this optimization using the JDBC API.
A good data fetch plan can make a difference between a high-performance data access layer and one that barely crawls. For this reason, I explained how the fetch size and the result set size affect transaction performance.
Transactions is a very complex topic. This chapter goes beyond the SQL standard phenomena and isolation levels, and it explains all possible non-serializable data anomalies and various concurrency control mechanisms. Transactions are important, not just for ensuring data effectiveness and avoiding data integrity issues but for efficiently access data too.
There is also a sample chapter, which you can read it for free and get a feeling of what this book can offer you. The sample chapter can be either read online, or it can be downloaded as PDF, mobi or epub (just like the actual book).
Enjoy reading it and let me know what you think.