The XTRADB_RSEG table was added in MariaDB 10.0.9.
The Information Schema XTRADB_RSEG table contains information about the XtraDB rollback segments.
The PROCESS privilege is required to view the table.
It has the following columns:
| Column | Description |
|---|---|
rseg_id |
Rollback segment id. |
space_id |
Space where the segment is placed. |
zip_size |
Size in bytes of the compressed page size, or zero if uncompressed. |
page_no |
Page number of the segment header. |
max_size |
Maximum size in pages. |
curr_size |
Current size in pages. |
The number of records will match the value set in the innodb_undo_logs variable (by default 128).
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https://mariadb.com/kb/en/information-schema-xtradb_rseg-table/