Ingres 9.2 Migration Guide - Actian

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Large File SupportLarge File SupportA major enhancement to Ingres II 2.5 on operating systems that support 64bit file systems is the ability to support file sizes greater than 2 GB. Thismeans that larger table, dump, work, journal, and checkpoint files can beaccommodated in a single location. It also removes the 2 GB limit on the sizeof the transaction log file.Large CatalogsIn this release, system catalogs can use pages larger than 2 KB. As a result,the user does not have to configure a 2 KB cache size in the DBMS for systemcatalogs.Row Locking for System CatalogsFor improved concurrency, the Ingres II 2.5 DBMS automatically uses rowlocking on system catalogs when catalogs are created using pages larger than2 KB. This feature is keyed from the system default page size, which isconfigurable through Configuration-By-Forms or Configuration Manager.Createdb creates a database with system catalogs that have the default pagesize. Running sysmod on an existing database, however, does notautomatically convert the system catalogs to use the default page size. Theuser must use the “with page_size” keyword to achieve this.Update Mode LockingPrior to Ingres II 2.5, when the DBMS fetched a row for a cursor mode update,it would acquire an exclusive lock. In serializable mode, this lock would be helduntil the end of transaction, even when the row was not updated. In thisrelease, the Ingres DBMS acquires an update mode lock for the row that is acandidate for update. If the row is actually updated, the update mode lock isconverted to logical exclusive lock; otherwise, it is converted down to sharedlock or released, depending on the current isolation level. Update mode lockingis now the default for cursor updates.218 Migration Guide
Query Optimization and Execution EnhancementsValue Locking for Serializable Transaction with Equal PredicatePrior to Ingres II 2.5, the Ingres DBMS would hold a page lock on the leafpages on B-tree tables for a serializable update transaction, even when usingrow locking. This was done to prevent other users from inserting a row in thequalified range to be updated. In Ingres II 2.5, the DBMS uses a value lockingprotocol for serializable transactions with an equal predicate, thereby allowingbetter concurrency.Query Optimization and Execution EnhancementsIngres II 2.5 incorporates a variety of internal enhancements to thecompilation and execution of queries.Ingres Star FeaturesIn Ingres II 2.5 the Ingres Star Server now contains support for the 1Pcpluscommit protocol, which allows a single site that is not capable of supportingtwo-phase commit protocols to participate in a multi-site update within Star.This change allows a single database that is being accessed through an IngresEnterprise Access gateway that does not support the SQL prepare statement toparticipate in a multi-site Star update.Features Introduced in Ingres II 2.5 219
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Ingres ® 9.2 Migration GuideING-92
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Run VMSINSTAL .....................
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BEFORE Triggers....................
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Increased Maximum Size of Character
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Chapter 1: Planning the Upgrade Thi
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Upgrade TypesUpgradedb MethodThe up
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Required Installations for Upgradin
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How You Move an Existing Developmen
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How You Prepare Your ApplicationsRe
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How You Load Databases and Applicat
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How You Prepare for Development Ins
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How You Prepare for Development Ins
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Testing Applications and Procedures
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How You Practice the UpgradeHow You
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How You Upgrade Using the Upgradedb
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How You Perform an Upgrade Using Un
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Chapter 5: Troubleshooting Upgraded
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Application RebuildingApplication R
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Application RebuildingModifications
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Appendix A: Upgrading from Ingres 6
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Considerations for Ingres 6.4Decima
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Considerations for Ingres 6.4Applic
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Unload/Reload Procedure for Upgradi
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Corresponding Parameter NamesIngres
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Corresponding Parameter Names• Th
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Reserved Single KeywordsSQLQUELKeyw
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Reserved Double KeywordsSQLQUELKeyw
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Reserved Double KeywordsKeyword Non
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DBMS Server EnhancementsLOB Locator
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DBMS Server EnhancementsAutomatic S
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Appendix E: Features Introduced inI
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Ingres 9.2 Migration Guide - Actian

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