OpenEdge Data Management: DataServer for Microsoft SQL Server

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Chapter 2: Initial Programming Considerations • Use appropriate startup parameters — To process Unicode data in your client application, set your cpinternal client code page to utf-8. If you are executing file I/O against your Unicode data, set your client’s cpstream code page to utf-8. You also may consider several other available client code page settings for Unicode. For more information, see OpenEdge Development: Internationalizing Applications. • Prepare OpenEdge databases for Unicode — Your OpenEdge database does not need to be Unicode-enabled in order to be migrated to an ORACLE DataServer. The migration process will convert data from any ANSI code page to Unicode as part of the migration if you chose to move data during a migration and have specified a Unicode destination. If you have existing data in an OpenEdge database that you wish to convert to Unicode prior to migration, you can convert your non-Unicode data using one of two conversion utilities: – Data Administration dump and load utility – PROUTIL CONVCHAR character conversion utility For more information on these utilities, see OpenEdge Development: Internationalizing Applications. Data type support Unicode data and data types can be migrated to a MS SQL Server data source and pulled into a MS SQL Server DataServer schema holder. Table 8 defines the supported MS SQL Server data types and their maximum sizes. Table 8: Supported Unicode data types in MS SQL Server Data type Maximum size NCHAR 4000 characters NVARCHAR 4000 characters NVARCHAR(MAX) 2 30-1 characters NTEXT 2 30-1 characters MS SQL Server limits the size of CHAR and VARCHAR data types to 8000 bytes. When server data is represented by a single-byte ANSI code page, CHAR and VARCHAR data types can store 8000 characters. When SQL Server stores UCS-2 data in double-byte format, it restricts CHAR and VARCHAR data types to only 4000 characters. Therefore, when a non-Unicode OpenEdge database is migrated to MS SQL Server 2005 (or greater), the Maximum Varchar Length threshold is set to 8000 by default. Character data sized smaller than this threshold (which the user can configure lower) is converted to the VARCHAR native type. Character columns with widths greater than 8000 characters continue to be converted to the TEXT data type, MS SQL Server's legacy CLOB equivalent data type. However, when a Unicode OpenEdge database is migrated to MS SQL Server 2005 (or greater), the Maximum Varchar Length threshold is set to 4000 by default and cannot be set any higher. Character columns with widths greater than 4000 characters are converted to the NVARCHAR(max) data type (MS SQL Server's Unicode CLOB-equivalent data type). 64 OpenEdge Data Management: DataServer for Microsoft SQL Server
Indexes and sorting Database design issues You create and maintain all indexes from within the MS SQL Server data source using native tools, rather than with the Data Dictionary. A data source index uses a logical pointer to the physical locations of table rows in order to sequence data access. You can add and drop indexes but you cannot use their names in queries. The data source alone ultimately decides when and how to use indexes; its decisions are not affected by the DataServer. Give careful consideration to benefit and cost of creating indexes. Having indexes for frequently executed queries can greatly improve record retrieval performance. An abundance of unused or infrequently used indexes can have a negative impact on performance due to the overhead cost of maintaining the indexes. Using index definitions in the MS SQL Server data source, the DataServer builds index information in the schema holder. OpenEdge index definitions for the data source schema serve two purposes: 1. They allow you to use the OF option in ABL with the FOR EACH and FIND statements. Using the OF option improves the readability of your code. The OF keyword is equivalent to the SQL WHERE clause. You can use OF only when you have a field of the same name in two tables and the field is an index in at least one of the tables. Therefore, since the custnum field is common to both the order and customer tables, you could write the following statement: FOR EACH order OF customer: 2. They translate USE–INDEX to SQL ORDER BY for DataServer operations. A MS SQL Server data source uses the ORDER BY clause to assist in selecting the optimal index for the query. For example, if you define city-dept as a MS SQL Server data source primary key on the city and department fields, it is a unique index in the schema holder. In this case, the following OpenEdge statements are equivalent when accessing the data source: FOR EACH employee USE-INDEX city-dept: FOR EACH employee BY city BY department: Note: If you do not specify a USE-INDEX or BY clause, your query will return records in an unpredictable order. If your application requires a predictable order, use include a USE-INDEX or BY clause. OpenEdge Data Management: DataServer for Microsoft SQL Server 65
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® ® PROGRESS® OPENEDGE® OpenEdg
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Contents Preface . . . . . . . . .
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Contents Data output and retrieval
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Contents Migrating an OpenEdge data
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Tables Contents Table 1: DataServer
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Examples Contents Example 1: Passin
Page 13 and 14: Preface This Preface contains the f
Page 15 and 16: Chapter 5, “Configuring the DataS
Page 17 and 18: Before you begin Preface Before att
Page 19 and 20: In this example, STREAM stream, UNL
Page 21 and 22: After displaying a message, OpenEdg
Page 23 and 24: Preface Software Foundation (http:/
Page 25 and 26: Preface use, copy, modify, and dist
Page 27 and 28: Preface DISCLAIMS ALL WARRANTIES WI
Page 29 and 30: Preface INCLUDING ALL IMPLIED WARRA
Page 31 and 32: Preface WARRANTIES OF MERCHANTABILI
Page 33 and 34: Preface conditions for packages lik
Page 35 and 36: Introduction OpenEdge Data Manageme
Page 37 and 38: DataServer components DataServer co
Page 39 and 40: DataServer for MS SQL Server logic
Page 41 and 42: Figure 3 illustrates the schema-loa
Page 43 and 44: DataServer utilities DataServer uti
Page 45 and 46: DataServer configurations DataServe
Page 47 and 48: The remote DataServer configuration
Page 49 and 50: DataServer configurations Configuri
Page 51 and 52: Software requirements Software requ
Page 53 and 54: Guidelines for using the DataServer
Page 55 and 56: Initial Programming Considerations
Page 57 and 58: Database design issues Database des
Page 59 and 60: MS SQL Server DataServer data sourc
Page 61 and 62: Client code page Database design is
Page 63: Support for Unicode Database design
Page 67 and 68: Database design issues source’s c
Page 69 and 70: Triggers Database design issues Tri
Page 71 and 72: Data types Data types MS SQL Server
Page 73 and 74: Table 9: MS SQL Server data type eq
Page 75 and 76: Processing activities that require
Page 77 and 78: Table 11: MS SQL Server 2008 dateti
Page 79 and 80: Performing data type conversions Da
Page 81 and 82: Enabling Datetime data types using
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Page 87 and 88: ABL-to-MS SQL Server data type mapp
Page 89 and 90: Unknown value (?) Data types The Da
Page 91 and 92: Record creation Suppose that you ha
Page 93 and 94: Data source record locking Data sou
Page 95 and 96: Handling lock timeouts Data source
Page 97 and 98: Locking impact on queries Data sour
Page 99 and 100: Data source record locking When thi
Page 101 and 102: To avoid this type of problem, the
Page 103 and 104: Error handling If you use NO-ERROR
Page 105 and 106: Cursors Cursors A cursor is like a
Page 107 and 108: Cursors your specifications. Adjust
Page 109 and 110: • Block cursors are directly link
Page 111 and 112: FIND customer WHERE ROWID(customer)
Page 113 and 114: For example, the following statemen
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find.p /* This code accesses an Ope
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ABL issues Table 19 summarizes ABL
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RDBMS Stored Procedure Details Open
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RDBMS stored procedure basics RDBMS
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RDBMS stored procedure basics When
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Run Stored-Procedure details •
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Run Stored-Procedure details An exp
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Run Stored-Proc statement execution
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Run Stored-Procedure details Also n
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Loading results into a temp-table T
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Retrieving return codes Interfacing
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Interfacing with RDBMS stored proce
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Loading result sets into temp-table
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Employing additional enhancements I
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Handling errors Handling errors The
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ROWID Support This section presents
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ROWID Support The RUN STORED-PROC c
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ROWID Support If the table uses com
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Additional Features to Enhance Data
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Connection pooling Connection pooli
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DataServer connection management Co
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Firehose exclusions Connection pool
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Cursor downgrades Connection poolin
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Query tuning Query tuning How you s
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LOOKAHEAD NO-LOOKAHEAD SEPARATE-CON
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Query tuning Table 24: Query-tuning
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Join by SQLDB Join by SQLDB For que
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Table 25 describes how these contro
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Modifying the run-time schema check
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Configuring the DataServer Configur
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DataServer components Table 26: Ins
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Configuring a local DataServer Conf
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Configuring a remote DataServer 4.
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5162 Configuring a remote DataServe
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The ubroker.properties file Configu
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Configuring a remote DataServer Tab
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Configuring a remote DataServer The
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Creating a schema holder Creating a
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Creating a schema holder configurat
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Creating a schema holder 3. In the
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Creating a schema holder 10. Choose
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Typical configuration for a remote
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Typical configuration for a remote
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Connecting the DataServer You can s
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Starting a remote DataServer Starti
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Starting a remote DataServer If you
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Starting a remote DataServer Starti
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Connection guidelines Connection gu
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Connecting a schema holder at start
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Single-User Mode (-1) Read-Only (-R
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Using a remote DataServer configura
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Value pairs within the connect stri
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Connecting a schema holder Table 31
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qt_separate_connection qt_no_separa
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Connecting a schema holder Table 33
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Connecting a schema holder 1. Each
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Table 38 lists the DataServer log e
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Logging levels You can choose one o
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Enabling ABL to SQL Correlation in
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Connecting a schema holder Example
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Connection failures and OpenEdge re
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Connection failures and OpenEdge re
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Using the $UNIQUE_DSLOG environment
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The DataServer Tutorial OpenEdge Da
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Demonstration databases for DataSer
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Preparing to create demonstration d
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DataServer utilities When you acces
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Prime to ROWID identification ROWID
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Prime to ROWID identification inacc
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Creating a schema holder • Choose
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Creating a schema holder You can se
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Updating a schema holder Updating a
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Verifying a schema holder Verifying
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Verifying a schema holder 2. Type p
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Changing connection information in
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Deleting a schema holder Deleting a
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Managing server attributes See the
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Managing server attributes Defining
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Managing server attributes If the p
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Managing server attributes 6. The P
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Defining a default constraint defin
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Managing server attributes 5. Click
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Managing server attributes • Resu
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Migrating an OpenEdge database to M
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Delta df to MS SQL Server Increment
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Modifying field-level information Y
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Defining the ROWID Modifying a sche
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Adding extended ABL support Adding
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Adding extended ABL support 4. Chan
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Adding extended ABL support 3. Drop
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Troubleshooting This chapter descri
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ODBC options ODBC options The DataS
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ODBC options Table 56: DataServer o
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Using MS SQL Server and DataServer
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Large rows—the PRGRS_MINBUF optio
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ODBC options Wait time for asynchro
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Using the block cursor switches ODB
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Migration Issues This appendix disc
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Modifying your application Note the
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Sample code for the db.owner.Custom
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Server Related Command Line Utiliti
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OpenEdge Management or OpenEdge Exp
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Syntax Parameters service-name PROB
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Other command line utilities for th
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Data Type Details C This appendix s
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nvarchar 8 SQL_NVARCHAR CHARACTER t
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Using qt_debug to Analyze Performan
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Using qt_debug to analyze performan
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Index Numbers 4GLTrans log entry ty
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display format 309 overflow checkin
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INPUT-OUTPUT option retrieving para
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DataServer (-Dsrv) startup paramete
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221, 242, 359 Schema defined 40 loa
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