InnoDB supports multiple granularity locking which permits coexistence of row-level locks and locks on entire tables. To make locking at multiple granularity levels practical, additional types of locks called intention locks are used. Intention locks are table-level locks in InnoDB that indicate which ...
An insert intention lock is a type of gap lock set by INSERT operations prior to row insertion. This lock signals the intent to insert in such a way that multiple transactions inserting into the same index gap need not wait for each other if they are not inserting at the same position wi...
TheFOR n ROWS formof the INSERT statement inserts multiple rows into the table or view using values provided or referenced. Although not required, the values can come from host-variable arrays. This form of INSERT is supported in SQL procedure applications. However, because host-variable arrays ...
* in from another serializable transaction, take appropriate action. * * Skip checking for any granularity for which a parameter is missing. * * A tuple update or delete is in conflict if we have a predicate lock * against the relation or page in which the tuple exists, or against the *...
从上面这个输出来看,我们看到的现场是两个 insert 请求发生了死锁。单纯看这 2 个 SQL 的话,应该是产生锁等待才对,而不是死锁。 按照我们常规理解,session1 未 commit 前,应该是持有 id=1 上的 record lock(X),而 session2 和 session3 则都在等待这个锁的释放。而实际上呢,肯定不是这样的,否则也不至于...
rowid别名为oid或_rowid_，但在创建表的SQL声明语句中只能使用rowid作为关键字。如果在创建表的时候设置...
call the multiple .sql files through Batch script Calling the same function multiple times in the same SELECT statement Can a [non primary key] be referenced as [foriegn key] in other table? Can a uniqueidentifier have a default value? can I access function on remote server through linked se...
I noticed that in all your examples, you don’t close the InserterHelper (ih.close()) at the end of the transactions. Should that not be done manually or will the SQLOpenHelper take care of it? I perform a reset of my database outside the Helper and I get an ...
Which means we really only have to scale back insertmanyvalues,in the unit of work. Also for SQL Server, I pulled out "insertmanyvalues" entirely even for non-returning cases which is overkill. since it seems like all the DBs we're going to have to worry about this, we can: ...
With BulkInsertOrUpdate on SQLServer for those that will be updated it has to match with Id column, or other unique column(s) if using UpdateByProperties in which case orderBy done with those props instead of ID, due to how Sql MERGE works. To preserve insert order by Id in this case...