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Date: Mon, 23 Apr 2012 23:42:33 +0000 (UTC)
From: "Mike Matrigali (JIRA)" <jira@apache.org>
To: derby-dev@db.apache.org
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Subject: [jira] [Commented] (DERBY-5679) Rolling back a transaction leads to
 an inconsistent state
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    [ https://issues.apache.org/jira/browse/DERBY-5679?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13260083#comment-13260083 ] 

Mike Matrigali commented on DERBY-5679:
---------------------------------------

The design intent of the code was to not require all rows to be updated when a null default column was added.   Doing so will create a huge performance degredation for the operation for tables with lots of rows.  
                
> Rolling back a transaction leads to an inconsistent state
> ---------------------------------------------------------
>
>                 Key: DERBY-5679
>                 URL: https://issues.apache.org/jira/browse/DERBY-5679
>             Project: Derby
>          Issue Type: Bug
>          Components: Store
>    Affects Versions: 10.6.2.1, 10.8.2.2
>         Environment: >sysinfo
> ------------------ Java Information ------------------
> Java Version:    1.6.0_26
> Java Vendor:     Sun Microsystems Inc.
> Java home:       C:\Program Files (x86)\Java\jre6
> Java classpath:  .;C:\Program Files (x86)\Java\jre7\lib\ext\QTJava.zip;C:\Users\BMASON\Sandbox\libs\db-derby-10.8.2.2-bin\bin\../lib/derby.jar;C:\Users\BMASON\Sandbox\libs\db-derby-10.8.2.2-bin\bin\../lib/derbynet.jar;C:\Users\BMASON\Sandbox\libs\db-derby-10.8.2.2-bin\bin\../lib/derbyclient.jar;C:\Users\BMASON\Sandbox\libs\db-derby-10.8.2.2-bin\bin\../lib/derbytools.jar
> OS name:         Windows 7
> OS architecture: x86
> OS version:      6.1
> Java user name:  bmason
> Java user home:  C:\Users\BMASON
> Java user dir:   C:\Users\BMASON\Sandbox\libs\db-derby-10.8.2.2-bin\bin
> java.specification.name: Java Platform API Specification
> java.specification.version: 1.6
> java.runtime.version: 1.6.0_26-b03
> --------- Derby Information --------
> JRE - JDBC: Java SE 6 - JDBC 4.0
> [C:\Users\BMASON\Sandbox\libs\db-derby-10.8.2.2-bin\lib\derby.jar] 10.8.2.2 - (1181258)
> [C:\Users\BMASON\Sandbox\libs\db-derby-10.8.2.2-bin\lib\derbytools.jar] 10.8.2.2 - (1181258)
> [C:\Users\BMASON\Sandbox\libs\db-derby-10.8.2.2-bin\lib\derbynet.jar] 10.8.2.2 - (1181258)
> [C:\Users\BMASON\Sandbox\libs\db-derby-10.8.2.2-bin\lib\derbyclient.jar] 10.8.2.2 - (1181258)
> ------------------------------------------------------
> ----------------- Locale Information -----------------
> Current Locale :  [English/New Zealand [en_NZ]]
> Found support for locale: [cs]
>          version: 10.8.2.2 - (1181258)
> Found support for locale: [de_DE]
>          version: 10.8.2.2 - (1181258)
> Found support for locale: [es]
>          version: 10.8.2.2 - (1181258)
> Found support for locale: [fr]
>          version: 10.8.2.2 - (1181258)
> Found support for locale: [hu]
>          version: 10.8.2.2 - (1181258)
> Found support for locale: [it]
>          version: 10.8.2.2 - (1181258)
> Found support for locale: [ja_JP]
>          version: 10.8.2.2 - (1181258)
> Found support for locale: [ko_KR]
>          version: 10.8.2.2 - (1181258)
> Found support for locale: [pl]
>          version: 10.8.2.2 - (1181258)
> Found support for locale: [pt_BR]
>          version: 10.8.2.2 - (1181258)
> Found support for locale: [ru]
>          version: 10.8.2.2 - (1181258)
> Found support for locale: [zh_CN]
>          version: 10.8.2.2 - (1181258)
> Found support for locale: [zh_TW]
>          version: 10.8.2.2 - (1181258)
> ------------------------------------------------------
>            Reporter: Brett Mason
>            Priority: Critical
>         Attachments: RollbackFails - expected output.txt, RollbackFails.sql, derby-5679-01-aa-alterTableTouchAllRows.diff
>
>
> Rolling back a transaction can leave a table in an inconsistent state if the table has been previously altered through the addition of new columns. It appears that if newly added columns have not been changed from their default value, then when a transaction which sets new values for these columns is rolled back the new columns are not restored to their previous values.
> Attached is an ij script with fairly minimal steps to reproduce the problem on Derby 10.6.2.0 and 10.8.2.2 (Win7 x64, Sun 32-bit JRE 1.6.0.26). Expected and observed output also attached.
> Would appreciate any suggestions as to a workaround for this issue. Running SYSCS_UTIL.SYSCS_COMPRESS_TABLE on the table after adding the columns seems to avoid the problem but may be just masking the issue.

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