diff options
Diffstat (limited to 'storage/innobase/trx/trx0rec.c')
| -rw-r--r-- | storage/innobase/trx/trx0rec.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/storage/innobase/trx/trx0rec.c b/storage/innobase/trx/trx0rec.c index 2f1389ae263..f80f58493aa 100644 --- a/storage/innobase/trx/trx0rec.c +++ b/storage/innobase/trx/trx0rec.c @@ -36,6 +36,7 @@ Created 3/26/1996 Heikki Tuuri #ifndef UNIV_HOTBACKUP #include "dict0dict.h" #include "ut0mem.h" +#include "read0read.h" #include "row0ext.h" #include "row0upd.h" #include "que0que.h" @@ -1634,6 +1635,25 @@ trx_undo_prev_version_build( if (row_upd_changes_field_size_or_external(index, offsets, update)) { ulint n_ext; + /* We should confirm the existence of disowned external data, + if the previous version record is delete marked. If the trx_id + of the previous record is seen by purge view, we should treat + it as missing history, because the disowned external data + might be purged already. + + The inherited external data (BLOBs) can be freed (purged) + after trx_id was committed, provided that no view was started + before trx_id. If the purge view can see the committed + delete-marked record by trx_id, no transactions need to access + the BLOB. */ + + if ((update->info_bits & REC_INFO_DELETED_FLAG) + && read_view_sees_trx_id(purge_sys->view, trx_id)) { + /* treat as a fresh insert, not to + cause assertion error at the caller. */ + return(DB_SUCCESS); + } + /* We have to set the appropriate extern storage bits in the old version of the record: the extern bits in rec for those fields that update does NOT update, as well as the bits for |