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About This Document.......................................................................................................23
Supported Release Version Updates (RVUs)........................................................................................23
Intended Audience................................................................................................................................23
New and Changed Information in This Edition...................................................................................23
Document Organization.......................................................................................................................24
Notation Conventions...........................................................................................................................24
General Syntax Notation.................................................................................................................24
Related Documentation........................................................................................................................26
Neoview Customer Library.............................................................................................................26
Publishing History................................................................................................................................27
HP Encourages Your Comments..........................................................................................................27
1 Introduction...................................................................................................................29
SQL Language.......................................................................................................................................29
Security.................................................................................................................................................29
User IDs and Role............................................................................................................................29
Authorization ID.............................................................................................................................29
Data Consistency and Access Options..................................................................................................30
READ UNCOMMITTED ................................................................................................................30
READ COMMITTED ......................................................................................................................30
SERIALIZABLE or REPEATABLE READ.......................................................................................31
SKIP CONFLICT..............................................................................................................................31
Database Integrity and Locking............................................................................................................31
Lock Duration..................................................................................................................................31
Lock Granularity..............................................................................................................................31
Lock Mode.......................................................................................................................................31
Lock Holder.....................................................................................................................................32
Transaction Management......................................................................................................................32
Statement Atomicity........................................................................................................................32
User-Defined and System-Defined Transactions............................................................................33
User-Defined Transactions.........................................................................................................33
System-Defined Transactions.....................................................................................................33
Rules for DML Statements...............................................................................................................33
Effect of AUTOCOMMIT Option....................................................................................................33
Concurrency....................................................................................................................................33
Transaction Access Modes...............................................................................................................35
READ ONLY...............................................................................................................................35
READ WRITE.............................................................................................................................36
Transaction Isolation Levels............................................................................................................36
READ UNCOMMITTED............................................................................................................36
READ COMMITTED..................................................................................................................36
SERIALIZABLE or REPEATABLE READ .................................................................................36
Transaction Rollback Mode.............................................................................................................37
ANSI Compliance and Neoview SQL Extensions................................................................................37
ANSI-Compliant Statements...........................................................................................................37
Statements That Are Neoview SQL Extensions..............................................................................38
ANSI-Compliant Functions.............................................................................................................38
Neoview SQL Error Messages..............................................................................................................39
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