Manual:Serialization

The following database fields contain serialized data:
 * fa_metadata
 * img_metadata
 * job_params
 * lc_value
 * log_params (in the case of page moves)
 * oi_metadata
 * rc_params (in the case of page moves)
 * old_text (sometimes; see old_flags and ar_flags)

The data type is generally blob or mediumblob.