Documentation Home
MySQL 5.7 Reference Manual
Related Documentation Download this Manual
PDF (US Ltr) - 35.0Mb
PDF (A4) - 35.1Mb
Man Pages (TGZ) - 255.4Kb
Man Pages (Zip) - 360.2Kb
Info (Gzip) - 3.4Mb
Info (Zip) - 3.4Mb
Excerpts from this Manual

10.14.4.3 Diagnostics During Index.xml Parsing

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:

    mysql> SELECT _utf8'test' COLLATE utf8_test_ci;
    ERROR 1273 (HY000): Unknown collation: 'utf8_test_ci'
    mysql> SHOW WARNINGS;
    +---------+------+----------------------------------------+
    | Level   | Code | Message                                |
    +---------+------+----------------------------------------+
    | Error   | 1273 | Unknown collation: 'utf8_test_ci'      |
    | Warning | 1273 | Expansion is too long at 'abcdefghi=x' |
    +---------+------+----------------------------------------+