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SYS_SYNC_HISTORY_COLUMNS
If you turn on synchronization history for a table, you can turn it on for all columns, or only for a subset of columns. If you turn it on for a subset of columns, then the SYS_SYNC_HISTORY_COLUMNS table records which columns you are keeping synchronization history information for. There is one row in SYS_SYNC_HISTORY_COLUMNS for each column that you keep synchronization history for.
The columns in the SYS_SYNC_HISTORY_COLUMNS system table are described in the following table:
 
Column name
Description
REL_ID
The ID of the table to keep sync history for.
COLUMN_NUMBER
The ordinal number of the column in that table that we keep sync history for. (For example, if we keep sync history for the second column in the table, then this field will hold the number 2.
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System tables for data synchronization