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10.13.4.3 Diagnostics During Index.xml Parsing

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The MySQL server generates diagnostics when it finds problems while parsing the Index.xml file:

  • Unknown tags are written to the error log. For example, the following message results if a collation definition contains a <aaa> tag: 

    [Warning] Buffered warning: Unknown LDML tag:
'charsets/charset/collation/rules/aaa'

  • If collation initialization is not possible, the server reports an “Unknown collation” error, and also generates warnings explaining the problems, such as in the previous example. In other cases, when a collation description is generally correct but contains some unknown tags, the collation is initialized and is available for use. The unknown parts are ignored, but a warning is generated in the error log.

  • Problems with collations generate warnings that clients can display with SHOW WARNINGS. Suppose that a reset rule contains an expansion longer than the maximum supported length of 6 characters: 

    <reset>abcdefghi</reset>
<i>x</i>

    An attempt to use the collation produces warnings:

    1. mysql> SELECT _utf8'test' COLLATE utf8_test_ci;
    2. ERROR 1273 (HY000): Unknown collation: 'utf8_test_ci'
    3. mysql> SHOW WARNINGS;
    4. +---------+------+----------------------------------------+
    5. | Level   | Code | Message                                |
    6. +---------+------+----------------------------------------+
    7. | Error   | 1273 | Unknown collation: 'utf8_test_ci'      |
    8. | Warning | 1273 | Expansion is too long at 'abcdefghi=x' |
    9. +---------+------+----------------------------------------+

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Document created the 26/06/2006, last modified the 26/10/2018
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