我们的一位客户拥有一个Oracle 10.2.0.5 RAC（HPUX）和两个SQL Server 2012（Windows server 2008R2）。我们正在帮助他们将数据从Oracle发布到SQL Server。他们还需要知道添加，更新和删除哪些行，但他们不想修改他们的应用程序。
整件事情都是这样的：
Oracle as publisher - ＆gt; SQL Server A作为分发者 - ＆gt; SQL Server B为 订户
我们的DBA通过SSMS（SQL Server Management Studio）配置了所有数据库，如Create a Publication from an Oracle Database。它工作了好几天。但甲骨文的表现越来越差。最后，我们必须停止Oracle的数据发布。
事实证明，SSMS将创建一个名为＆＃34; HREPL＆＃34;在Oracle中，它有一个名为＆＃34; PollEnd＆＃34;的过程。 ＆＃34; PollEnd＆＃34;将以非常高的频率执行以删除表格中的数据＆＃34; HREPL_ARTICLE1LOG_1＆＃34;。但是＆＃34; PollEnd＆＃34;的执行时间随时间增加。最后，执行时间比执行的时间跨度长，表被锁定，Oracle的性能会非常糟糕。
我们被困在这里。
有人知道如何解决这个问题吗？请帮忙！
＆＃34;民意调查＆＃34;程序：
-----------------------------------------------------------------------------------
--
-- Name: PollEnd
-- Purpose: PollEnd request signifies that the change entries identified with the current
-- interval have been successfully entered into the store and forward database
-- and can be deleted from the article log tables.
-- Input:
-- argLSN IN RAW(10) LSN from distributor that was associated
-- with this poll interval
-- Output:
-- Notes: This request causes those entries of the article log tables represented in the
-- Poll Table and having the current pollid to be deleted from both their article log
-- tables and from the Poll Table. The last request value is updated to reflect a
-- PollEnd request.
--
-----------------------------------------------------------------------------------
PROCEDURE PollEnd
(
argLSN IN RAW
)
AS
SQLCommand VARCHAR2(500);
LogTable VARCHAR2(255);
CurrentPollID NUMBER;
TableIDs number_tab;
InstanceIDs number_tab;
IDCount BINARY_INTEGER;
PublisherLSN RAW(10);
BEGIN
-- Put the published tableIDs in a PL/SQL table of IDs
HREPL.GetTableIDs(TableIDs, InstanceIDs);
-- Get the current Poll ID
SELECT Publisher_CurrentPollid INTO CurrentPollID FROM HREPL_Publisher;
IDCount := TableIDs.COUNT;
-- For each table represented in the ID list
FOR id_ind IN 1 .. IDCount
LOOP
LogTable := REPLACE( REPLACE(ArticleLogTemplate, MatchString, TO_CHAR(TableIDs(id_ind))),
MatchStringY, TO_CHAR(InstanceIDs(id_ind)));
BEGIN
-- Generate command to delete from the article log those entries appearing in the
-- Poll Table with the current PollID
SQLCommand := 'DELETE FROM ' || LogTable || ' l ' ||
'WHERE EXISTS (SELECT p.POLL_POLLID FROM HREPL_POLL p ' ||
' WHERE CHARTOROWID(l.ROWID) = p.Poll_ROWID ' ||
' AND p.Poll_PollID = :Pollid)';
HREPL.ExecuteCommandForPollID(SQLCommand, CurrentPollID);
EXCEPTION
WHEN OTHERS THEN NULL;
END;
END LOOP;
FOR POLLID IN (SELECT CurrentPollid FROM DUAL)
LOOP
-- Delete from HREPL_Event those entries appearing in the Poll Table
-- with the current PollID.
DELETE FROM HREPL_Event e
WHERE EXISTS (SELECT p.POLL_POLLID FROM HREPL_POLL p
WHERE CHARTOROWID(e.ROWID) = p.Poll_ROWID
AND p.Poll_PollID = POLLID.CurrentPollID);
-- Delete entries from the Poll Table having the current Pollid
DELETE FROM HREPL_Poll
WHERE Poll_PollID = POLLID.CurrentPollID;
END LOOP;
-- Drop all views associated with articles that are marked as UnPublishPending.
-- Note: We cannot perform these drops in UnPublish table, since UnPublish
-- table can execute concurrently with PollBegin and the querying
-- of published tables by the log reader. PollEnd, however, executes
-- synchronously with respect to these activities, so can be used
-- to cleanup log tables and views that are no longer needed.
HREPL.CleanupLogsandViews;
-- Mark the last request as PollEnd, and update the Publisher LSN
-- to reflect the LSN committed at the publisher.
UPDATE HREPL_Publisher
SET Publisher_PollInProcess = NoPollInProcess,
Publisher_LSN = argLSN;
-- Commit transaction
COMMIT;
EXCEPTION
WHEN OTHERS THEN
ROLLBACK;
RAISE;
END PollEnd;
编辑01：
完整的套餐在这里：HREPL
编辑02：
最后我们放弃了。 MS和Oracle互相指责。
我们尝试使用ogg将数据从oracle复制到sql server，这也很麻烦。
现在我们正在尝试使用ogg将数据从oracle复制到oracle。
感谢您的帮助。
答案 0 :(得分：1)
转换DELETE ... WHERE EXISTS (...)个查询以使用多个表删除语法。
SQLCommand := 'DELETE l' ||
' FROM HREPL_POLL, ' || LogTable ||
' l WHERE CHARTOROWID(l.ROWID) = p.Poll_ROWID ' ||
' AND p.Poll_PollID = :Pollid)';
在所涉及的每个表上创建一个函数索引：
CREATE INDEX MYTABLE_CHARTOROWID ON MYTABLE(CHARTOROWID(ROWID));
然后再往下走：
DELETE e
FROM HREPL_POLL p, HREPL_Event e
WHERE CHARTOROWID(e.ROWID) = p.Poll_ROWID
AND p.Poll_PollID = POLLID.CurrentPollID;
最后，完全删除LOOP超过双重 - 它绝对没有任何意义;只需直接使用CurrentPollid执行其中的代码。
答案 1 :(得分：1)
有些加入条件似乎不合理，你可能会对这个版本更幸运 - 如果你在制作时试一试，那么你自己承担风险！
-----------------------------------------------------------------------------------
--
-- Name: PollEnd
-- Purpose: PollEnd request signifies that the change entries identified with the current
-- interval have been successfully entered into the store and forward database
-- and can be deleted from the article log tables.
-- Input:
-- argLSN IN RAW(10) LSN from distributor that was associated
-- with this poll interval
-- Output:
-- Notes: This request causes those entries of the article log tables represented in the
-- Poll Table and having the current pollid to be deleted from both their article log
-- tables and from the Poll Table. The last request value is updated to reflect a
-- PollEnd request.
--
-----------------------------------------------------------------------------------
PROCEDURE PollEnd
(
argLSN IN RAW
)
AS
SQLCommand VARCHAR2(500);
LogTable VARCHAR2(255);
CurrentPollID NUMBER;
TableIDs number_tab;
InstanceIDs number_tab;
IDCount BINARY_INTEGER;
PublisherLSN RAW(10);
BEGIN
-- Put the published tableIDs in a PL/SQL table of IDs
HREPL.GetTableIDs(TableIDs, InstanceIDs);
-- Get the current Poll ID
SELECT Publisher_CurrentPollid INTO CurrentPollID FROM HREPL_Publisher;
IDCount := TableIDs.COUNT;
-- For each table represented in the ID list
FOR id_ind IN 1 .. IDCount
LOOP
LogTable := REPLACE( REPLACE(ArticleLogTemplate, MatchString, TO_CHAR(TableIDs(id_ind))),
MatchStringY, TO_CHAR(InstanceIDs(id_ind)));
BEGIN
-- Generate command to delete from the article log those entries appearing in the
-- Poll Table with the current PollID
SQLCommand := 'DELETE FROM ' || LogTable || ' l ' ||
'WHERE l.ROWID IN (SELECT chartorowid(p.Poll_ROWID) FROM HREPL_POLL p ' ||
' WHERE p.Poll_PollID = :Pollid)';
HREPL.ExecuteCommandForPollID(SQLCommand, CurrentPollID);
EXCEPTION
WHEN OTHERS THEN NULL;
END;
END LOOP;
-- Delete from HREPL_Event those entries appearing in the Poll Table
-- with the current PollID.
DELETE FROM HREPL_Event e
WHERE ROWID in (SELECT chartorowid(p.Poll_ROWID) FROM HREPL_POLL p
WHERE p.Poll_PollID = CurrentPollID);
-- Delete entries from the Poll Table having the current Pollid
DELETE FROM HREPL_Poll
WHERE Poll_PollID = CurrentPollID;
-- Drop all views associated with articles that are marked as UnPublishPending.
-- Note: We cannot perform these drops in UnPublish table, since UnPublish
-- table can execute concurrently with PollBegin and the querying
-- of published tables by the log reader. PollEnd, however, executes
-- synchronously with respect to these activities, so can be used
-- to cleanup log tables and views that are no longer needed.
HREPL.CleanupLogsandViews;
-- Mark the last request as PollEnd, and update the Publisher LSN
-- to reflect the LSN committed at the publisher.
UPDATE HREPL_Publisher
SET Publisher_PollInProcess = NoPollInProcess,
Publisher_LSN = argLSN;
-- Commit transaction
COMMIT;
EXCEPTION
WHEN OTHERS THEN
ROLLBACK;
RAISE;
END PollEnd;