diff options
Diffstat (limited to 'innobase/include/btr0sea.h')
| -rw-r--r-- | innobase/include/btr0sea.h | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/innobase/include/btr0sea.h b/innobase/include/btr0sea.h index 14feca5d5c5..ee762a12221 100644 --- a/innobase/include/btr0sea.h +++ b/innobase/include/btr0sea.h @@ -234,10 +234,16 @@ struct btr_search_sys_struct{ extern btr_search_sys_t* btr_search_sys; /* The latch protecting the adaptive search system: this latch protects the -(1) positions of records on those pages where a hash index has been built. -NOTE: It does not protect values of non-ordering fields within a record from -being updated in-place! We can use fact (1) to perform unique searches to -indexes. */ +(1) hash index; +(2) columns of a record to which we have a pointer in the hash index; + +but does NOT protect: + +(3) next record offset field in a record; +(4) next or previous records on the same page. + +Bear in mind (3) and (4) when using the hash index. +*/ extern rw_lock_t* btr_search_latch_temp; |