注意:tuple->t_data的位置是HeapTupleData往后偏移多少能到HeapTupleHeaderData头的位置 内存结构是:HeapTupleData+HeapTupleHeaderData+数据 代码语言:javascript 复制 heap_form_tuple...len=offsetof(HeapTupleHeaderData,t_bits): 计算出头的大小len=23,t_bits是柔性数组指针 hoff=len=MAXALIGN(len);: 对齐hoff=...
newTuple =heap_form_tuple(tupleDesc, values, nulls); newTuple->t_data->t_ctid = oldTuple->t_data->t_ctid; newTuple->t_self = oldTuple->t_self;if(tupleDesc->tdhasoid) HeapTupleSetOid(newTuple, HeapTupleGetOid(oldTuple)); heap_inplace_update(gp_fastsequence_rel, newTuple); heap...
SnapshotNow,1, skey);while(HeapTupleIsValid(tuple = systable_getnext(scan))) { Form_pg_constraint con = (Form_pg_constraint) GETSTRUCT(tuple); Datum adatum;boolisNull; ArrayType *arr; int16 *attnums;intnumkeys;inti;boolfound_col;/* Only PK constraints are of interest for now, see ...
HeapTupleHeaderSetXmin(tup->t_data, xid);HeapTupleHeaderSetCmin(tup->t_data, cid); HeapTupleHeaderSetXmax(tup->t_data,0);/*for cleanliness*/tup->t_tableOid =RelationGetRelid(relation);/** If the new tuple is too big for storage or contains already toasted * out-of-line attributes ...
heap_insert(Relation relation, HeapTuple tup, CommandId cid,intoptions, BulkInsertState bistate) {/**Form_pg_class tmprel = relation->rd_rel; NameData tmprelname= tmprel->relname; fprintf(stderr,"Insert into: %s\n", tmprelname.data); ...
heap_insert(Relation relation, HeapTuple tup, CommandId cid,intoptions, BulkInsertState bistate) {/**Form_pg_class tmprel = relation->rd_rel; NameData tmprelname= tmprel->relname; fprintf(stderr,"Insert into: %s\n", tmprelname.data); ...
heap_insert(Relation relation, HeapTuple tup, CommandId cid,intoptions, BulkInsertState bistate) {/**Form_pg_class tmprel = relation->rd_rel; NameData tmprelname= tmprel->relname; fprintf(stderr,"Insert into: %s\n", tmprelname.data); ...
corrupt index, in the form of entries pointing to tuple slots that by now contain some unrelated content. In any case we would prefer to be able to do vacuuming without invoking any user-written code. HOT solves this problem for a restricted but useful special case: ...
Line pointers form a simple array, which plays the role of index to the tuples. Each index is numbered sequentially from 1, and called offset number. When a new tuple is added to the page, a new line pointer is also pushed onto the array to point to the new one. ...
今天在调试的时候突然冒出来一句:HEAPCORRUPTION DETECTED: after normal block at 0x0067B860, CRTdetected that the application wrote to the memory after end of heapbuffer。 大概意思是在0x0067B860出现一个阻塞,CRT侦测到在堆缓存尾段有程序试图写进内存。意思... ...