OpenEdge Data Management: DataServer for Microsoft SQL Server

More documents

Recommendations

Info

Chapter 4: Additional Features to Enhance DataServer Performance Enhancements overview When you develop a DataServer application, you can design it either to emphasize portability across data sources or to optimize the strengths of the DataServer’s interaction with a MS SQL Server database. For example, you might write a query that gives you consistent results across databases or one that takes advantage of MS SQL Server’s cursor management functionality. In addition to influencing how DataServer applications perform through queries, you can control how the DataServer processes queries on a statement-by-statement basis. Some of the DataServer’s default behavior might not be optimal for the application you are designing. The QUERY–TUNING phrase and startup and connection parameters give you the ability to control query processing. Information on query tuning appears in the following locations: • The remaining sections of this chapter document the QUERY–TUNING phrase. • For information on tuning queries at compile time and run time, see the “Query tuning with connection and startup parameters” section on page 227. 160 OpenEdge Data Management: DataServer for Microsoft SQL Server
Connection pooling Connection pooling The DataServer for Microsoft SQL Server is enhanced with the ability to form a connection pool. A connection pool is a set of database connections that are available for an application to use and reuse without having to be reestablished. Connection pooling significantly improves the cursor management associated with no-lock queries, particularly multi-table joins. Creating and tearing down connections can be resource intensive. Using a pooled connection to keep existing connections alive results in significant performance gains because the DataServer avoids the overhead of making a connection for each request. ABL applications that open multiple no-lock queries and handle their results simultaneously experience the best cumulative performance gains from connection pooling. Main components Connection pooling for the DataServer for Microsoft SQL Server is a combination of ODBC connection pooling and DataServer connection management. These connection components can be used as follows: • Individually, ODBC connection pooling or DataServer connection management provides the foundation required for firehose cursors, but enabling both provides the best performance. For more information on firehose cursors, see the “Firehose and Fast Forward-Only Cursors” section on page 164. Without a connection pool, firehose cursors would block an application until a full result set is retrieved. Because of this, when connection pooling is disabled, firehose cursors are also disabled. By maintaining multiple connections and one cursor per connection, read-only requests only block the connection on which they retrieve results, freeing ABL applications to continue processing data on the other connections. • ODBC connection pooling and DataServer connection management provide the highest performance improvements when enabled together, but they can also be enabled independent of one another. For installations where the number of ODBC connections is limited, you might decide to enable only the DataServer connection management. For deployments in which memory constraints are a concern, enabling only the ODBC connection pool provides on-demand connections, with optimized resource efficiency. If both an ODBC connection pool and managed connections coexist in the same DataServer process, the managed connections will come from the ODBC connection pool. The managed connections are distinguished from the connection pool connections in that they are never released back to the pool for the life of an ABL session. OpenEdge Data Management: DataServer for Microsoft SQL Server 161
Page 1 and 2:
® ® PROGRESS® OPENEDGE® OpenEdg
Page 3 and 4:
Contents Preface . . . . . . . . .
Page 5 and 6:
Contents Data output and retrieval
Page 7 and 8:
Contents Migrating an OpenEdge data
Page 9 and 10:
Tables Contents Table 1: DataServer
Page 11 and 12:
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 and 64:
Support for Unicode Database design
Page 65 and 66:
Indexes and sorting 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
Page 83 and 84:
2008, or if you use a native driver
Page 85 and 86:
Default and Special Datetime Defaul
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
Page 115 and 116: find.p /* This code accesses an Ope
Page 117 and 118: ABL issues Table 19 summarizes ABL
Page 119 and 120: RDBMS Stored Procedure Details Open
Page 121 and 122: RDBMS stored procedure basics RDBMS
Page 123 and 124: RDBMS stored procedure basics When
Page 125 and 126: Run Stored-Procedure details •
Page 127 and 128: Run Stored-Procedure details An exp
Page 129 and 130: Run Stored-Proc statement execution
Page 131 and 132: Run Stored-Procedure details Also n
Page 133 and 134: Loading results into a temp-table T
Page 135 and 136: Retrieving return codes Interfacing
Page 137 and 138: Interfacing with RDBMS stored proce
Page 141 and 142: Loading result sets into temp-table
Page 143 and 144: Employing additional enhancements I
Page 151 and 152: Handling errors Handling errors The
Page 153 and 154: ROWID Support This section presents
Page 155 and 156: ROWID Support The RUN STORED-PROC c
Page 157 and 158: ROWID Support If the table uses com
Page 159: Additional Features to Enhance Data
Page 163 and 164: DataServer connection management Co
Page 165 and 166: Firehose exclusions Connection pool
Page 167 and 168: Cursor downgrades Connection poolin
Page 169 and 170: Query tuning Query tuning How you s
Page 171 and 172: LOOKAHEAD NO-LOOKAHEAD SEPARATE-CON
Page 173 and 174: Query tuning Table 24: Query-tuning
Page 175 and 176: Join by SQLDB Join by SQLDB For que
Page 177 and 178: Table 25 describes how these contro
Page 179 and 180: Modifying the run-time schema check
Page 181 and 182: Configuring the DataServer Configur
Page 183 and 184: DataServer components Table 26: Ins
Page 185 and 186: Configuring a local DataServer Conf
Page 187 and 188: Configuring a remote DataServer 4.
Page 189 and 190: 5162 Configuring a remote DataServe
Page 191 and 192: The ubroker.properties file Configu
Page 193 and 194: Configuring a remote DataServer Tab
Page 195 and 196: Configuring a remote DataServer The
Page 197 and 198: Creating a schema holder Creating a
Page 199 and 200: Creating a schema holder configurat
Page 201 and 202: Creating a schema holder 3. In the
Page 203 and 204: Creating a schema holder 10. Choose
Page 205 and 206: Typical configuration for a remote
Page 207 and 208: Typical configuration for a remote
Page 209 and 210: Connecting the DataServer You can s
Page 211 and 212:
Starting a remote DataServer Starti
Page 213 and 214:
Starting a remote DataServer If you
Page 215 and 216:
Starting a remote DataServer Starti
Page 217 and 218:
Connection guidelines Connection gu
Page 219 and 220:
Connecting a schema holder at start
Page 221 and 222:
Single-User Mode (-1) Read-Only (-R
Page 223 and 224:
Using a remote DataServer configura
Page 225 and 226:
Value pairs within the connect stri
Page 227 and 228:
Connecting a schema holder Table 31
Page 229 and 230:
qt_separate_connection qt_no_separa
Page 231 and 232:
Connecting a schema holder Table 33
Page 233 and 234:
Connecting a schema holder 1. Each
Page 235 and 236:
Table 38 lists the DataServer log e
Page 237 and 238:
Logging levels You can choose one o
Page 239 and 240:
Enabling ABL to SQL Correlation in
Page 241 and 242:
Connecting a schema holder Example
Page 243 and 244:
Connection failures and OpenEdge re
Page 245 and 246:
Connection failures and OpenEdge re
Page 247 and 248:
Using the $UNIQUE_DSLOG environment
Page 249 and 250:
The DataServer Tutorial OpenEdge Da
Page 251 and 252:
Demonstration databases for DataSer
Page 253 and 254:
Preparing to create demonstration d
Page 255 and 256:
Page 257 and 258:
Page 259 and 260:
DataServer utilities When you acces
Page 261 and 262:
Prime to ROWID identification ROWID
Page 263 and 264:
Prime to ROWID identification inacc
Page 265 and 266:
Creating a schema holder • Choose
Page 267 and 268:
Creating a schema holder You can se
Page 269 and 270:
Updating a schema holder Updating a
Page 271 and 272:
Verifying a schema holder Verifying
Page 273 and 274:
Verifying a schema holder 2. Type p
Page 275 and 276:
Changing connection information in
Page 277 and 278:
Deleting a schema holder Deleting a
Page 279 and 280:
Managing server attributes See the
Page 281 and 282:
Managing server attributes Defining
Page 283 and 284:
Managing server attributes If the p
Page 285 and 286:
Managing server attributes 6. The P
Page 287 and 288:
Defining a default constraint defin
Page 289 and 290:
Managing server attributes 5. Click
Page 291 and 292:
Managing server attributes • Resu
Page 293 and 294:
Migrating an OpenEdge database to M
Page 295 and 296:
Page 297 and 298:
Page 299 and 300:
Page 301 and 302:
Page 303 and 304:
Delta df to MS SQL Server Increment
Page 305 and 306:
Page 307 and 308:
Page 309 and 310:
Modifying field-level information Y
Page 311 and 312:
Defining the ROWID Modifying a sche
Page 313 and 314:
Adding extended ABL support Adding
Page 315 and 316:
Adding extended ABL support 4. Chan
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
Page 323 and 324:
ODBC options Table 56: DataServer o
Page 325 and 326:
Using MS SQL Server and DataServer
Page 327 and 328:
Large rows—the PRGRS_MINBUF optio
Page 329 and 330:
ODBC options Wait time for asynchro
Page 331 and 332:
Using the block cursor switches ODB
Page 333 and 334:
Migration Issues This appendix disc
Page 335 and 336:
Modifying your application Note the
Page 337 and 338:
Sample code for the db.owner.Custom
Page 339 and 340:
Server Related Command Line Utiliti
Page 341 and 342:
OpenEdge Management or OpenEdge Exp
Page 343 and 344:
Page 345 and 346:
Page 347 and 348:
Page 349 and 350:
Syntax Parameters service-name PROB
Page 351 and 352:
Other command line utilities for th
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
Page 359 and 360:
Using qt_debug to analyze performan
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
show all

OpenEdge Data Management: DataServer for Microsoft SQL Server

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?