HP c-tree-SQL ISQL and Tools manual Transaction Isolation Level isolationlevel, Tbl

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ISQL and Tools

DISPLAY COST ON OFF

SET DISPLAY COST ON displays the values the c-treeSQL optimizer uses to calculate the least-costly query strategy for a particular SQL statement.

The UPDATE STATISTICS statement updates the values displayed by SET DISPLAY COST ON. SET DISPLAY COST OFF suppresses the display and is the default.

AUTOCOMMIT ON OFF

SET AUTOCOMMIT ON commits changes and starts a new transaction immediately after each SQL statement is executed. SET AUTOCOMMIT OFF is the default. SET AUTOCOM- MIT OFF requires that you end transactions explicitly with a COMMIT or ROLLBACK WORK statement.

TRANSACTION ISOLATION LEVEL isolation_level

Specifies the isolation level. Isolation levels specify the degree to which one transaction can modify data or database objects being used by another concurrent transaction. The default is 3. See the SET TRANSACTION ISOLATION LEVEL statement in the c-treeSQL Reference Manual for more information on isolation levels.

CONNECTION { database_name DEFAULT}

Sets the active connection to database_name or to the default connection. See the description of the CONNECT statement in the c-treeSQL Reference Manual for details on connections.

Notes

SET REPORT and SET ECHO are similar:

•SET REPORT affects the SPOOL file only, and ON suppresses statement display

•SET ECHO affects standard output only, and OFF suppresses statement display Other statements control other characteristics of an interactive SQL session:

•The editor invoked by the EDIT statement is controlled by the value of the environment variable EDITOR.

•The file to which interactive SQL writes output is controlled by the SPOOL filename ON statement.

Examples

ISQL> -- Illustrate PAGESIZE

ISQL> DISPLAY "Here's a page break!" ON PAGE ISQL> SET PAGESIZE 4

ISQL> BREAK ON PAGE;

ISQL> SELECT TBL FROM SYSTABLES; TBL

---

sys_chk_constrs Here's a page break!

TBL

---

3-36	FairCom Corporation

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Contents Isql and Tools Reference Guide For use with c-treeSQL ServerPage Table of Contents Data Load Utility dbload Tutorial Source Code IiiFairCom Corporation Purpose of this Manual Syntax Diagram ConventionsDocumentation Overview AudienceRelated Documentation Isql and ToolsIntroduction OverviewIsql and Tools FairCom Corporation Init Quick TourIntroductory Tutorial IsqlIsql Create Table Custmast DefineManage Isql Commit Work CustmastQuick Tour DoneComplete Introductory Tutorial Code Relational Model and Indexing Tutorial ISQLTutorial2.sqlQuick Tour Values Insert IntoValues Insert Into Commit Work QTY PriceComplete Relational Model and Indexing Tutorial Source Code Locking Tutorial ISQLTutorial3.sql@ISQL @iSQLTutorial3.sql Isql Delete from Custmast Complete Locking Tutorial Source Code Transaction Processing Tutorial ISQLTutorial4.sqlTransaction Rollback Work Complete Transaction Processing Tutorial Source Code Syntax Isql StatementsStarting Interactive SQL ArgumentsUsername PasswordStatement History Support ConnectstringIsql Statements for Statement History Support Formatting Output of Isql QueriesIsql Statements Statement SummaryIsql Statements for Query Formatting Summary DisplayExample 3-1 Unformatted Query Display from Isql Customername Customercity Orderid OrdervalueFormatting Column Display with the Column Statement Example 3-2 Controlling Display Width of Character ColumnsCustomername Customercity Example 3-3 Customizing Format of Numeric Column DisplaysOrdervalue Example 3-4 Specifying Column Breaks and Values with Display Numorders Customername Example 3-6 Specifying a Query Header and Footer with Title Help and Table Statements Transaction SupportDescription Isql Reference1 @ Execute Syntax ExampleBreak Syntax BreakspecCustomername ExamplesSkip n Clear Syntax HistoryOption ArgumentColumn Syntax Break Column Compute Display TitleHeading headingtext ColumnnameFormat formatstring Date-Time Format Strings for the Column Statement Character DescriptionChar Null ? Type Length ColnameNot Null INT Sysdate OrderinfoAmount NEW Title FLDColumn Title ComputeAVG MAX MIN SUM Count VariablenameDefine Syntax ValueCOL columnnumber ColpositionDisplayvalue @columnnameEdit Syntax Exit Exit or Quit SyntaxRelated Statements 10 GET Syntax Isql GET query.sqlIsql RUN History Syntax Help CommandsclausesHelp Syntax Orderstate LotlocationFollowing example illustrates usage of the History statement From HostcommandHost or SH or Syntax List Syntax Quit Quit or Exit Syntax16 RUN Syntax Isql HistoryPagesize Save Syntax18 SET Syntax LinesizePagesize numberlines Isql Break on Isql Select TBL from Systables TBL Connection databasename DefaultTransaction Isolation Level isolationlevel TBLShow Syntax Filename on Is Default ?Spool Syntax Database ConnectionsIsql Spool STK on Start SyntaxArgument … Isql Spool OFFNull ? Type Length Colname Not Null INT Not Null VarcharDate TablenameType Length Colname Null ? Text Title SyntaxLeft Center Right COL n DoubleIsql Clear Title Isql and Tools FairCom Corporation Data Load Utility dbload IntroductionPrerequisites for Dbload Dbload Command Line SyntaxCommandsfile OptionsData File Formats Data Load Utility dbloadFixed Length Records Commands FileVariable Length Records Next RecordDefine Record Statement Char Short Long Float DoubleFor Each Statement NullExample 4-1 Sample dbload commands files ExamplesPosition not specified for fixed length record Compilation ErrorsRecord name redefined Fatal Errors Isql and Tools FairCom Corporation Data Unload Utility dbdump Prerequisites for DbdumpDbdump Command Line Syntax Data Unload Utility dbdump Short Long Float DoubleFor Record Statement Define Record custrec of Fixed Length 37 AS Isql and Tools FairCom Corporation Schema Export Utility dbschema Username.tablename Username.procedurenameOutfile Username.triggernameImport Begin Schema Export Utility dbschemaDbschema ENDIsql and Tools FairCom Corporation Tutorial Source Code Commit Work Select * from Custmast Delete from CustmastVARCHAR6 IntegerMoney Tutorial Source Code Commit Work Delete from CustmastImdesc VARCHAR48 Select * from orderlist Select * from orderitems Isql and Tools FairCom Corporation Symbols Index-iIsql Index-ii FairCom CorporationIndex Index-iii FairCom Corporation