Although it's a bad practice, Oracle allows the columns to be named arbitrarily using the double-quote syntax. With this, the names can include keywords, lowercase or unicode characters.
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- For lowercase names: as the SQL is case insensitive and apply does not use double quotes, just create the column name in uppercase on the target
- For unicode: not supported
- For spaces in names: not supported (although spaces at the beginning or end of column names are ignored)
- For keywords: a global rename function is implemented. This APPLY_COLUMN_NAMES_MAP variable specifies a global rule renaming all columns in all replicated tables with a specified name to a different name.
Syntax:
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set *.APPLY_COLUMN_NAMES_MAP coumn1=newcolumn1[,column2=newcolumn2[,...]] |
Example:
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set *.APPLY_COLUMN_NAMES_MAP COMMENT=COMMENT_COLUMN |
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APPLY process requires a restart to implement this mapping. |
After restart, APPLY process log will show column mapping details as follow.
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013/05/03 05:34:37 INFO> Column translate: [COMMENT]=>[COMMENT_COLUMN] |