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MDL-38972 add upgrade info for duplicate index-key problems

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Petr Škoda 2013-04-17 16:08:16 +02:00
parent 02e5f81c94
commit 2d97513d12
1 changed files with 2 additions and 0 deletions
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lib/upgrade.txt
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@ -65,6 +65,8 @@ information provided here is intended especially for developers.
Database (DML) layer:
* $DB->sql_empty() is deprecated, you have to use sql parameters with empty values instead,
please note hardcoding of empty strings in SQL queries breaks execution in Oracle database.
* Indexes must not be defined on the same columns as keys, this is now reported as fatal problem.
Please note that internally we create indexes instead of foreign keys.
YUI changes:
* M.util.help_icon has been deprecated. Code should be updated to use moodle-core-popuphelp