All of the following data dictionary tables have a LAST_ANALYZED column (replace * with USER/ALL/DBA as appropriate:

*_TABLES

*_TAB_PARTITIONS

*_TAB_SUBPARTITIONS

*_INDEXES

*_IND_PARTITIONS

*_IND_SUBPARTITIONS

(There's lots more in the histograms fields, but I'm not going that deep.)

Conversely, ALL_TAB_MODIFICATIONS shows rows inserted/updated/deleted (or the timestamp on which a table/partition/subpartition was truncated) since it had optimizer statistics gathered.

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