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Diffstat (limited to 'storage/innobase/include/row0vers.h')
| -rw-r--r-- | storage/innobase/include/row0vers.h | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/storage/innobase/include/row0vers.h b/storage/innobase/include/row0vers.h new file mode 100644 index 00000000000..079d841f7f3 --- /dev/null +++ b/storage/innobase/include/row0vers.h @@ -0,0 +1,100 @@ +/****************************************************** +Row versions + +(c) 1997 Innobase Oy + +Created 2/6/1997 Heikki Tuuri +*******************************************************/ + +#ifndef row0vers_h +#define row0vers_h + +#include "univ.i" +#include "data0data.h" +#include "dict0types.h" +#include "trx0types.h" +#include "que0types.h" +#include "rem0types.h" +#include "mtr0mtr.h" +#include "read0types.h" + +/********************************************************************* +Finds out if an active transaction has inserted or modified a secondary +index record. NOTE: the kernel mutex is temporarily released in this +function! */ + +trx_t* +row_vers_impl_x_locked_off_kernel( +/*==============================*/ + /* out: NULL if committed, else the active + transaction; NOTE that the kernel mutex is + temporarily released! */ + rec_t* rec, /* in: record in a secondary index */ + dict_index_t* index, /* in: the secondary index */ + const ulint* offsets);/* in: rec_get_offsets(rec, index) */ +/********************************************************************* +Finds out if we must preserve a delete marked earlier version of a clustered +index record, because it is >= the purge view. */ + +ibool +row_vers_must_preserve_del_marked( +/*==============================*/ + /* out: TRUE if earlier version should be preserved */ + dulint trx_id, /* in: transaction id in the version */ + mtr_t* mtr); /* in: mtr holding the latch on the clustered index + record; it will also hold the latch on purge_view */ +/********************************************************************* +Finds out if a version of the record, where the version >= the current +purge view, should have ientry as its secondary index entry. We check +if there is any not delete marked version of the record where the trx +id >= purge view, and the secondary index entry == ientry; exactly in +this case we return TRUE. */ + +ibool +row_vers_old_has_index_entry( +/*=========================*/ + /* out: TRUE if earlier version should have */ + ibool also_curr,/* in: TRUE if also rec is included in the + versions to search; otherwise only versions + prior to it are searched */ + rec_t* rec, /* in: record in the clustered index; the + caller must have a latch on the page */ + mtr_t* mtr, /* in: mtr holding the latch on rec; it will + also hold the latch on purge_view */ + dict_index_t* index, /* in: the secondary index */ + dtuple_t* ientry); /* in: the secondary index entry */ +/********************************************************************* +Constructs the version of a clustered index record which a consistent +read should see. We assume that the trx id stored in rec is such that +the consistent read should not see rec in its present version. */ + +ulint +row_vers_build_for_consistent_read( +/*===============================*/ + /* out: DB_SUCCESS or DB_MISSING_HISTORY */ + rec_t* rec, /* in: record in a clustered index; the + caller must have a latch on the page; this + latch locks the top of the stack of versions + of this records */ + mtr_t* mtr, /* in: mtr holding the latch on rec; it will + also hold the latch on purge_view */ + dict_index_t* index, /* in: the clustered index */ + ulint** offsets,/* in/out: offsets returned by + rec_get_offsets(rec, index) */ + read_view_t* view, /* in: the consistent read view */ + mem_heap_t** offset_heap,/* in/out: memory heap from which + the offsets are allocated */ + mem_heap_t* in_heap,/* in: memory heap from which the memory for + old_vers is allocated; memory for possible + intermediate versions is allocated and freed + locally within the function */ + rec_t** old_vers);/* out, own: old version, or NULL if the + record does not exist in the view, that is, + it was freshly inserted afterwards */ + + +#ifndef UNIV_NONINL +#include "row0vers.ic" +#endif + +#endif |