tailieunhanh - HyperSQL User Guide HyperSQL Database Engine (HSQLDB) 2.2

The initial version of Gamma consisted of 17 VAX 11/750 processors, each with two megabytes of memory. An 80 megabit/second token ring [PROT85] was used to connect the processors to each other and to another VAX running Unix. This processor acted as the host machine for Gamma. Attached to eight of the processors were 333 megabyte Fujitsu disk drives that were used for storing the database. The diskless processors were used along with the processors with disks to execute join and aggregate function operators in order to explore whether diskless pro- cessors could be exploited effectively | HyperSQL User Guide HyperSQL Database Engine HSQLDB Edited by Blaine Simpson and Fred Toussi HyperSWL HyperSQL User Guide HyperSQL Database Engine HSQLDB by Blaine Simpson and Fred Toussi Revision 5139 Publication date 2013-01-20 18 39 53 0000 Copyright 2002-2013 The HSQL Development Group. Permission is granted to distribute this document without any alteration under the terms of the HSQLDB license. You are not allowed to distribute or display this document on the web in an altered form. HyperSWL Table of Contents Preface . xiii Available formats for this document . xiii 1. Running and Using HyperSQL . 1 The HSQLDB Jar . 1 Running Database Access Tools . 1 A HyperSQL Database . 2 In-Process Access to Database Catalogs . 3 Server Modes . 3 HyperSQL HSQL Server . 4 HyperSQL HTTP Server . 4 HyperSQL HTTP Servlet . 4 Connecting to a Database Server . 4 Security Considerations . 5 Using Multiple Databases . 5 Accessing the Data . 5 Closing the Database . 6 Creating a New Database . 7 2. SQL Language . 8 Standards Support . 8 SQL Data and Tables . 9 Temporary Tables . 9 Persistent Tables . 9 Lob Data . 10 Short Guide to Data Types . 10 Data Types and Operations . 11 Numeric Types . 11 Boolean Type . 13 Character String Types . 14 Binary String Types . 15 Bit String Types . 15 Storage and Handling of Java Objects . 16 Type Length Precision and Scale . 16 Datetime types . 17 Interval Types . 20 Arrays . 23 Array Definition . 23 Array Reference . 25 Array Operations . 25 Indexes and Query Speed . 27 Query Processing and Optimisation . 28 Indexes and Conditions . 28 Indexes and Operations . 29 Indexes and oRdER by offset and LIMIT . 29 3. Sessions and Transactions . 31 Overview . 31 Session Attributes and Variables . 31 Session Attributes . 32 Session Variables . 32 Session Tables . 32 Transactions and Concurrency Control . 33 Two Phase Locking . 33 .

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