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But in many cases this only provides a modest improvement as each UPDATE operation still requires a round-trip communication with the database server.In the case where the application server and database server are on different hosts, the round-trip will involve network latency as well.The illustration in Figure 1 below shows an item master table from Application A along with a supplemental custom item extension table; this table, as the name suggsts, provides supplemental columns not provided by the application’s Item Master.While it is relatively easy to retrieve and modify the data from both tables using RPG and subfiles, it is not so easy to do with SQL, especially in a client/server application.But if there are a large number of rows that require an update, then the overhead of issuing large numbers of UPDATE statements can result in the operation as a whole taking a long time to complete.The traditional advice for improving performance for multiple UPDATE statements is to “prepare” the required query once, and then “execute” the prepared query once for each row requiring an update.For simplicity, consider the following common scenario: An i Series has multiple item tables holding data related in a one-to-one relationship.

(Bug #11758262, Bug #50439) See Section, “Determination of Safe and Unsafe Statements in Binary Logging”, for more information.Sometimes using SQL to perform simultaneous inserts, updates and deletes against related tables can be a chore.It would be convenient if programmers could simply treat related tables as a single table for the purpose of modifying data.But it's hard to tell from what has been explicitly given in your question.PDF (US Ltr) - 37.7Mb PDF (A4) - 37.7Mb PDF (RPM) - 37.0Mb HTML Download (TGZ) - 10.2Mb HTML Download (Zip) - 10.3Mb HTML Download (RPM) - 8.9Mb Man Pages (TGZ) - 214.7Kb Man Pages (Zip) - 327.7Kb Info (Gzip) - 3.4Mb Info (Zip) - 3.4Mb My SQL Backup and Recovery My SQL Globalization My SQL Information Schema My SQL Installation Guide My SQL and Linux/Unix My SQL and OS X My SQL Partitioning My SQL Performance Schema My SQL Replication Using the My SQL Yum Repository My SQL Restrictions and Limitations Security in My SQL My SQL and Solaris Building My SQL from Source Starting and Stopping My SQL My SQL Tutorial My SQL and Windows My SQL NDB Cluster 7.5 option as part of a table reference.

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statement can be accomplished in one of two ways, primarily depending upon which version of SQL Server you are using.

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