The target table is an empty or non-empty heap. The target table is not used in replication. The TABLOCK hint is specified for the target table. Rows that are inserted into a heap as the result of an insert action in a MERGE statement may also be minimally logged. Unlike the BULK IN...
OffsetNumber offnum;/* inserted tuple's offset */uint8 flags;/* xl_heap_header & TUPLE DATA in backup block 0 */} xl_heap_insert;#defineSizeOfHeapInsert (offsetof(xl_heap_insert, flags) + sizeof(uint8))6、xl_heap_headertypedefstructxl_heap_header{ uint16 t_infomask2; uint16 t_in...
很显然会在记录间隙之间加上 GAP 锁,而insert语句首先会对记录加插入意向锁,插入意向锁和 GAP 锁冲突,所以不存在幻读;如果先执行insert语句后执行select...lock in share mode语句,由于insert语句在插入记录之后,会对记录加 X 锁,它会阻止select...lock in share mode对记录加 S 锁,...
Zeilen, die infolge einer Einfügeaktion in eine MERGE-Anweisung in einen Heap eingefügt werden, können ebenfalls minimal protokolliert werden.Im Gegensatz zur BULK INSERT-Anweisung, die eine weniger restriktive Massenupdatesperre enthält, weist INSERT INTO…SELECT mit dem TABLOCK-Hinweis ...
Additionally, in Device Manager, under Other devices, the Smart Card device has a status of DNF (Driver not found).This frequently requires the user to obtain one of the following items from the smart card issuer to resolve this error:...
First, the database must find a place to store the row. For a regular heap table—which has no particular row order—the database can take any table block that has enough free space. This is a very simple and quick process, mostly executed in main memory. All the database has to do...
block, next_rec_heap_no, index, thr); trx_mutex_exit(trx); }else{ err = DB_SUCCESS; } 这里是检查是否有和插入意向锁冲突的其他锁,如果有冲突,就将插入意向锁加到锁等待队列中。这很显然是先执行 select ... lock in share mode 语句再执行 insert...
A. Inserting data into a heap with minimal logging The following example creates a a new table (a heap) and inserts data from another table into it using minimal logging. The example assumes that the recovery model of the AdventureWorks2008R2 database is set to FULL. To ensure minimal loggi...
内存中,内部临时表的最大值。服务器默认设置为max_heap_table_size和tmp_table_size二者中的最小值。如果有足够的内存,并且Created_tmp_disk_tables状态变量在增大,增大该值很有必要。 event_scheduler 是否打开时间调度器。默认关闭。打开后, 可通过show processlist查看到user为event_scheduler的工作线程。
Insert {10, 12, 1, 14, 6, 5, 8, 15, 3, 9, 7, 4, 11, 13, 2} one at a time, into an initially empty min-heap, the resulting heap sequence is:;1,3,2,12,6,4,8,15,14,9,7,5,11,13,10;1,2,3,4,5,6,7,8,9,10,11,12,13,14,15;1,2,3,6,7,5,4,15,14,12...