OpenEdge Data Management: DataServer for Microsoft SQL Server

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Chapter 8: Troubleshooting ODBC_DEF_BLKCACHESZ is the default value for QT_CACHE_SIZE when block cursors are enabled. This value is currently set to 10,000 bytes. ODBC_DEF_LHDCACHESZ is the default value of QT_CACHE_SIZE when lookahead cursors are enabled. It is currently set at 30,000 bytes. The value of QT_CACHE_SIZE represents an upper limit for the row space available to the lookahead cache, not the amount of space a lookahead cache will actually use. This highlights a key distinction between block and lookahead cursors. The “cache size” for block cursors is preallocated before results are retrieved so this value represents an actual allocated amount. For lookahead cursors, memory is accrued as rows are read back from the result set and added to the cache. So the “cache size” specifies an upper limit on the number of cached rows allowable, not an exact amount of space that will be allocated as is the case with block cursors. Adjusting values With the default size, approximately 6.5 open cursors and result sets per table can be established at a given time before the maximum block memory area (PRGRS_TABLE_BLOCKSIZE) is exceeded. At 10,000 bytes, 104 new block allocations can be established before the maximum block memory (PRGRS_MAX_MBLOCKSIZE) is exceeded. If record sizes are large or the typical row counts for your results sets are large, you can consider increasing one or both of these sizes. Conversely, if record sizes are small or the typical row counts for your results are small, you can consider decreasing theses sizes. Consider setting these tuning parameters based on your typical requirements and then override them for specific queries that are the exceptions using the query tuning option. ODBC driver problems The ODBC drivers use the Microsoft Windows DLL technology. A driver problem can leave the driver’s DLL in an unstable state. In this case, the next attempt to connect to the driver might fail with a GPF or with an unexpected error message. If this occurs, you might need to unload the driver’s DLL by using Windows utilities or by restarting Windows. In addition, drivers utilized by ODBC can get overlaid with incompatible DLL versions as other products are installed on your system. You might need to reinstall ODBC drivers and products if such incompatibilities occur. 332 OpenEdge Data Management: DataServer for Microsoft SQL Server
Migration Issues This appendix discusses migration issues. It explains how to migrate from the DataServer for ODBC to the DataServer for MS SQL Server, and also discusses a trigger issue with upgrades from Version 9.1 of the MS SQL Server DataServer. Specifically, this appendix documents the topics outlined in the following sections: • Creating a schema holder • Modifying your application • Modifying your insert trigger A OpenEdge Data Management: DataServer for Microsoft SQL Server 333
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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
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Preface This Preface contains the f
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Chapter 5, “Configuring the DataS
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Before you begin Preface Before att
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In this example, STREAM stream, UNL
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After displaying a message, OpenEdg
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Preface Software Foundation (http:/
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Preface use, copy, modify, and dist
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Preface DISCLAIMS ALL WARRANTIES WI
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Preface INCLUDING ALL IMPLIED WARRA
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Preface WARRANTIES OF MERCHANTABILI
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Preface conditions for packages lik
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Introduction OpenEdge Data Manageme
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DataServer components DataServer co
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DataServer for MS SQL Server logic
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Figure 3 illustrates the schema-loa
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DataServer utilities DataServer uti
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DataServer configurations DataServe
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The remote DataServer configuration
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DataServer configurations Configuri
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Software requirements Software requ
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Guidelines for using the DataServer
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Initial Programming Considerations
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Database design issues Database des
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MS SQL Server DataServer data sourc
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Client code page Database design is
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Support for Unicode Database design
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Indexes and sorting Database design
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Database design issues source’s c
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Triggers Database design issues Tri
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Data types Data types MS SQL Server
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Table 9: MS SQL Server data type eq
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Processing activities that require
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Table 11: MS SQL Server 2008 dateti
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Performing data type conversions Da
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Enabling Datetime data types using
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2008, or if you use a native driver
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Default and Special Datetime Defaul
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ABL-to-MS SQL Server data type mapp
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Unknown value (?) Data types The Da
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Record creation Suppose that you ha
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Data source record locking Data sou
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Handling lock timeouts Data source
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Locking impact on queries Data sour
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Data source record locking When thi
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To avoid this type of problem, the
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Error handling If you use NO-ERROR
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Cursors Cursors A cursor is like a
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Cursors your specifications. Adjust
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• Block cursors are directly link
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FIND customer WHERE ROWID(customer)
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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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Page 311 and 312: Defining the ROWID Modifying a sche
Page 313 and 314: Adding extended ABL support Adding
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Page 317 and 318: Adding extended ABL support 3. Drop
Page 319 and 320: Troubleshooting This chapter descri
Page 321 and 322: ODBC options ODBC options The DataS
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Page 325 and 326: Using MS SQL Server and DataServer
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Page 335 and 336: Modifying your application Note the
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Page 353 and 354: Data Type Details C This appendix s
Page 355 and 356: nvarchar 8 SQL_NVARCHAR CHARACTER t
Page 357 and 358: Using qt_debug to Analyze Performan
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Page 361 and 362: Index Numbers 4GLTrans log entry ty
Page 363 and 364: display format 309 overflow checkin
Page 365 and 366: INPUT-OUTPUT option retrieving para
Page 367 and 368: DataServer (-Dsrv) startup paramete
Page 369 and 370: 221, 242, 359 Schema defined 40 loa
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