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This option is known to be broken when tablespaces contain off-page columns after crash recovery. It has only been tested when creating the data files from the scratch. btr_blob_dbg_t: A map from page_no:heap_no:field_no to first_blob_page_no. This map is instantiated for every clustered index in index->blobs. It is protected by index->blobs_mutex. btr_blob_dbg_msg_issue(): Issue a diagnostic message. Invoked when btr_blob_dbg_msg is set. btr_blob_dbg_rbt_insert(): Insert a btr_blob_dbg_t into index->blobs. btr_blob_dbg_rbt_delete(): Remove a btr_blob_dbg_t from index->blobs. btr_blob_dbg_cmp(): Comparator for btr_blob_dbg_t. btr_blob_dbg_add_blob(): Add a BLOB reference to the map. btr_blob_dbg_add_rec(): Add all BLOB references from a record to the map. btr_blob_dbg_print(): Display the map of BLOB references in an index. btr_blob_dbg_remove_rec(): Remove all BLOB references of a record from the map. btr_blob_dbg_is_empty(): Check that no BLOB references exist to or from a page. Disowned references from delete-marked records are tolerated. btr_blob_dbg_op(): Perform an operation on all BLOB references on a B-tree page. btr_blob_dbg_add(): Add all BLOB references from a B-tree page to the map. btr_blob_dbg_remove(): Remove all BLOB references from a B-tree page from the map. btr_blob_dbg_restore(): Restore the BLOB references after a failed page reorganize. btr_blob_dbg_set_deleted_flag(): Modify the 'deleted' flag in the BLOB references of a record. btr_blob_dbg_owner(): Own or disown a BLOB reference. btr_page_create(), btr_page_free_low(): Assert that no BLOB references exist. btr_create(): Create index->blobs for clustered indexes. btr_page_reorganize_low(): Invoke btr_blob_dbg_remove() before copying the records. Invoke btr_blob_dbg_restore() if the operation fails. btr_page_empty(), btr_lift_page_up(), btr_compress(), btr_discard_page(): Invoke btr_blob_dbg_remove(). btr_cur_del_mark_set_clust_rec(): Invoke btr_blob_dbg_set_deleted_flag(). Other cases of modifying the delete mark are either in the secondary index or during crash recovery, which we do not promise to support. btr_cur_set_ownership_of_extern_field(): Invoke btr_blob_dbg_owner(). btr_store_big_rec_extern_fields(): Invoke btr_blob_dbg_add_blob(). btr_free_externally_stored_field(): Invoke btr_blob_dbg_assert_empty() on the first BLOB page. page_cur_insert_rec_low(), page_cur_insert_rec_zip(), page_copy_rec_list_end_to_created_page(): Invoke btr_blob_dbg_add_rec(). page_cur_insert_rec_zip_reorg(), page_copy_rec_list_end(), page_copy_rec_list_start(): After failure, invoke btr_blob_dbg_remove() and btr_blob_dbg_add(). page_cur_delete_rec(): Invoke btr_blob_dbg_remove_rec(). page_delete_rec_list_end(): Invoke btr_blob_dbg_op(btr_blob_dbg_remove_rec). page_zip_reorganize(): Invoke btr_blob_dbg_remove() before copying the records. page_zip_copy_recs(): Invoke btr_blob_dbg_add(). row_upd_rec_in_place(): Invoke btr_blob_dbg_rbt_delete() and btr_blob_dbg_rbt_insert(). innobase_start_or_create_for_mysql(): Warn when UNIV_BLOB_DEBUG is enabled. rb://550 approved by Jimmy Yang