Re: Question regarding the database page layout.
От | Gregory Stark |
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Тема | Re: Question regarding the database page layout. |
Дата | |
Msg-id | 878wv3ucog.fsf@oxford.xeocode.com обсуждение исходный текст |
Ответ на | Question regarding the database page layout. ("Ryan Bradetich" <rbradetich@gmail.com>) |
Ответы |
Re: Question regarding the database page layout.
Re: Question regarding the database page layout. |
Список | pgsql-hackers |
"Ryan Bradetich" <rbradetich@gmail.com> writes: > After a cursory glance at the HeapTupleHeaderData structure, it appears it > could be aligned with INTALIGN instead of MAXALIGN. The one structure I was > worried about was the 6 byte t_ctid structure. The comments in > src/include/storage/itemptr.h file indicate the ItemPointerData structure is > composed of 3 int16 fields. So everthing in the HeapTupleHeaderData > structure is 32-bits or less. Sure, but the tuple itself could contain something with double alignment. If you have a bigint or double in the tuple then heap_form_tuple needs to know where to put it so it ends up at right alignment. -- Gregory Stark EnterpriseDB http://www.enterprisedb.com Ask me about EnterpriseDB's Slony Replication support!
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