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MySQL 5.7 Reference Manual
Related Documentation Download this Manual Excerpts from this Manual 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:
  • 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:


    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' |

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