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https://issues.apache.org/jira/browse/DERBY-4677?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mike Matrigali updated DERBY-4677:
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I have reviewed the DERBY4677_diff_patch1.txt patch, and the fix and the
tests look good to me. +1 on committing it to trunk and after it passes tests
across platforms backporting as appropriate.
There should be a good release note describing the corruption and that the fix
does not actually fix the existing problems, just stops it from happening in
the future. Seems like a drop and recreate of unique indexes on nullable
columns is only guaranteed way to fix existing issues. And the recreate index
will fail if the bug has allowed unique violations. There may be a query one
can write to identify unique violations, but it may be tricky as DERBY may
optimize based on "knowing" there can't be unique violations.
> SYSCS_COMPRESS_TABLE disables unique constraints
> ------------------------------------------------
>
> Key: DERBY-4677
> URL: https://issues.apache.org/jira/browse/DERBY-4677
> Project: Derby
> Issue Type: Bug
> Components: SQL
> Affects Versions: 10.4.1.3, 10.4.2.0, 10.4.2.1, 10.5.1.1, 10.5.2.0,
> 10.5.3.0, 10.6.1.0
> Environment: Output of sysinfo:
> ------------------ Java Information ------------------
> Java Version: 1.6.0_20
> Java Vendor: Sun Microsystems Inc.
> Java home: C:\Program Files (x86)\Java\jre6
> Java classpath: .;C:\Program Files
> (x86)\Java\jre6\lib\ext\QTJava.zip;C:\Users\BMASON\Sandbox\libs\db-derby-10.6.1.0-bin\bin\../lib/derby.jar;C:\Users\BMASON\Sandbox\libs\db-derby-10.6.1.0-bin\bin\../lib/derbynet.jar;C:\Users\BMASON\Sandbox\libs\db-derby-10.6.1.0-bin\bin\../lib/derbyclient.jar;C:\Users\BMASON\Sandbox\libs\db-derby-10.6.1.0-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-10.6.1.0-bin\bin
> java.specification.name: Java Platform API Specification
> java.specification.version: 1.6
> java.runtime.version: 1.6.0_20-b02
> --------- Derby Information --------
> JRE - JDBC: Java SE 6 - JDBC 4.0
> [C:\Users\BMASON\Sandbox\libs\db-derby-10.6.1.0-bin\lib\derby.jar] 10.6.1.0 -
> (938214)
> [C:\Users\BMASON\Sandbox\libs\db-derby-10.6.1.0-bin\lib\derbytools.jar]
> 10.6.1.0 - (938214)
> [C:\Users\BMASON\Sandbox\libs\db-derby-10.6.1.0-bin\lib\derbynet.jar]
> 10.6.1.0 - (938214)
> [C:\Users\BMASON\Sandbox\libs\db-derby-10.6.1.0-bin\lib\derbyclient.jar]
> 10.6.1.0 - (938214)
> ------------------------------------------------------
> ----------------- Locale Information -----------------
> Current Locale : [English/New Zealand [en_NZ]]
> Found support for locale: [cs]
> version: 10.6.1.0 - (938214)
> Found support for locale: [de_DE]
> version: 10.6.1.0 - (938214)
> Found support for locale: [es]
> version: 10.6.1.0 - (938214)
> Found support for locale: [fr]
> version: 10.6.1.0 - (938214)
> Found support for locale: [hu]
> version: 10.6.1.0 - (938214)
> Found support for locale: [it]
> version: 10.6.1.0 - (938214)
> Found support for locale: [ja_JP]
> version: 10.6.1.0 - (938214)
> Found support for locale: [ko_KR]
> version: 10.6.1.0 - (938214)
> Found support for locale: [pl]
> version: 10.6.1.0 - (938214)
> Found support for locale: [pt_BR]
> version: 10.6.1.0 - (938214)
> Found support for locale: [ru]
> version: 10.6.1.0 - (938214)
> Found support for locale: [zh_CN]
> version: 10.6.1.0 - (938214)
> Found support for locale: [zh_TW]
> version: 10.6.1.0 - (938214)
> ------------------------------------------------------
> Reporter: Brett Mason
> Assignee: Mamta A. Satoor
> Attachments: DERBY4677_diff_patch1.txt, DERBY4677_stat_patch1.txt
>
>
> It appears that running SYSCS_UTIL.SYSCS_COMPRESS_TABLE on a table with a
> null-able unique constraint will disable the unique constraint. The script
> below should reproduce the problem. The expected behaviour is for the second
> insert to fail due to the unique constraint but instead it is allowed. The
> second insert will fail as expected if either the call to
> SYSCS_COMPRESS_TABLE is skipped or if the column is declared NOT NULL.
> I have reproduced the problem using embedded Derby 10.5.1.1, 10.5.3.0 and
> 10.6.1.0 using ij.
> CREATE TABLE TABLE1(NAME1 INT UNIQUE);
> CALL SYSCS_UTIL.SYSCS_COMPRESS_TABLE('APP', 'TABLE1', 1);
> INSERT INTO TABLE1(NAME1) VALUES(1);
> INSERT INTO TABLE1(NAME1) VALUES(1);
> SELECT * FROM TABLE1;
> DROP TABLE TABLE1;
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