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Diffstat (limited to 'innobase/row/row0purge.c')
| -rw-r--r-- | innobase/row/row0purge.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/innobase/row/row0purge.c b/innobase/row/row0purge.c index b64003f22d4..104d71eda2d 100644 --- a/innobase/row/row0purge.c +++ b/innobase/row/row0purge.c @@ -429,7 +429,18 @@ skip_secondaries: index = dict_table_get_first_index(node->table); mtr_x_lock(dict_tree_get_lock(index->tree), &mtr); + + /* NOTE: we must also acquire an X-latch to the + root page of the tree. We will need it when we + free pages from the tree. If the tree is of height 1, + the tree X-latch does NOT protect the root page, + because it is also a leaf page. Since we will have a + latch on an undo log page, we would break the + latching order if we would only later latch the + root page of such a tree! */ + btr_root_get(index->tree, &mtr); + /* We assume in purge of externally stored fields that the space id of the undo log record is 0! */ |