In the abap keyword documentation, EXSQL_DSQL_DUPLICATE_CURSOR means: Cause: The specified cursor is already open. A cursor was specified at a OPEN-command in Native SQL which the cursor administration knows as already opened. But I can't create any connection, where the cursor come from?
The ProcessPoolExecutor class is an Executor subclass that uses a pool of processes to execute calls asynchronously. ProcessPoolExecutor uses the multiprocessing module, which allows it to side-step the Global Interpreter Lock but also means that only picklable objects can be executed and returned. ...
In these cases, the cursor is adjusted to start at the first row and return the number of rows requested. This frequently means that it returns rows that were in the PRIOR fetch buffer. Napomena This is the exact case in which the RPC status parameter is set to 2. B. Use P...
For SQL statements that are FREQUENTLY RE-EXECUTED, the bottom line isthis:if you want to maximize performance, make sure these SQL statements stay "glued" to their respective Oracle cursor. What does it mean when a SQL statement is "glued" to its Oracle cursor? It means that both links ...
cursor 游标,是ORACLE数据库中SQL解析和执行的载体,本质上是C语言中的一种结构structure. ORACLE数据库中cursor分类: shared cursor包括: parent cursor、child cursor session cursor包括: 隐式游标 implicit cursor、 显式游标 explicit cursor、 参考游标 ref cursor 两者关系是:一个session cursor只能对应一个shared...
array([[1, 2], [1.5, 1.8], [5, 8], [8, 8], [1, 0.6], [9, 11]]) kmeans = KMeans(k=2) kmeans.fit(X) predictions = kmeans.predict(X) colors = ['r', 'g', 'b', 'c', 'm', 'y'] for i in range(len(X)): plt.scatter(X[i][0], X[i][1], color=...
A SQL Management Object Mismatch means that either a SQL plan baseline, or a SQL profile, or a SQL patch has been created for your SQL statement between the executions. Because a cursor is a read-only entity, a hard parse is forced to be able to create a new cursor that contains ...
Well, we can see the previous two statement still there. The cursor for "select sid from v$mystat where rownum<2" should been closed in the test session. But we can still see it. But if you set the session_cached_cursor to 0 which means no cursor can be cached in the session. You...
This means that a cursor variable can be opened for any query. The most important benefit of a cursor variable is that it enables passing the result of a query between PL/SQL programs. Without a cursor variable, you have to fetch all data from a cursor, store it in a variable e.g.,...
cursor result in an automatic re-fetch of the row. This re-fetch means that updates can create a hole themselves. The re-fetched row also reflects changes as a result of triggers updating the same row. It is important to reflect these changes to maintain the consistency of data in the ...