sqlserver，读写数据库分离问题
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所有回答(9)
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不能保证。
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分情况吧，
如果对延时的问题超级不克容忍的话，数据库级别还真是没法搞定，只能用内存缓存工具。
如果可以容忍稍稍一点延时，但是不能容忍脏数据，那可以额外弄个时间戳记录来对比下是否最新数据。
其实sqlserver 读写分离性能还是可以的，考虑远一点没错，但是比如半年内都没这个忧虑，可以先把系统做起来先。
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读库写库要是能保证这样,还分什么读写啊.直接2个写库不更好
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读写分离零延时是一种错觉
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读写分离不是为了应对你这种情况吧
读写分离是为了提高sql server 服务器的性能 让其不成为瓶颈
将 及时数据 和非及时数据的查询进行分离服务器
及需要 知道及时数据的查询 和增删改 连主服务器
而那些汇众非及时 对实效性要求不高的查询连接 镜像服务器 （会有几秒延时）
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不知道你是想用sqlserver自身的功能实现读写分离，还是想通过程序实现读写分离
无论哪种方式，同步的情况都是理想的，即便alwayson，也只能是写入日志的同步，而不是刷新数据的同步
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用数据库索引，来完成查询，删除，录入等操作
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his XML file does not appear to have any style information associated with it. The document tree is shown below. <rss xmlns:clearspace="http://www.jivesoftware.com/xmlns/clearspace/rss" xmlns:dc="http://purl.org/dc/elements/1.1/" version="2.0"> <channel> <title> SCN: 消息列表 - icm/server_port_0 is in unchangeable mode. How to change? </title> <link> http://scn.sap.com/community/erp/60-upgrade?view=discussions </link> <description>Most recent forum messages</description> <language>en</language> <pubDate>Fri, 11 Oct 2013 12:34:30 GMT</pubDate> <generator> Jive Engage 5.0.6.2 (http://jivesoftware.com/products/) </generator> <dc:date>2013-10-11T12:34:30Z</dc:date> <dc:language>en</dc:language> <item> <title> Re: icm/server_port_0 is in unchangeable mode. How to change? </title> <link> http://scn.sap.com/message/14430938?tstart=0#14430938 </link> <description> <!-- [DocumentBodyStart:bca08907-ecd3-4859-ace2-91831ae47135] --><div class="jive-rendered-content"><p>Hi,</p><p>i wanted to know the entry in the gui when you change...</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Also please check that the below services are active in sicf.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><a class="jive-link-external-small" href="https://service.sap.com/sap/support/notes/1088717"><span class="urTxtH1" style="font-weight: bold;">Note 1088717 - Active services for Web Dynpro ABAP in transaction SICF</span></a></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Thanks</p><p>Rishi Abrol</p></div><!-- [DocumentBodyEnd:bca08907-ecd3-4859-ace2-91831ae47135] --> </description> <pubDate>Fri, 11 Oct 2013 12:34:29 GMT</pubDate> <guid> http://scn.sap.com/message/14430938?tstart=0#14430938 </guid> <dc:creator>Rishi Abrol</dc:creator> <dc:date>2013-10-11T12:34:29Z</dc:date> <clearspace:dateToText>2013-10-11 下午2:34</clearspace:dateToText> <clearspace:objectType>0</clearspace:objectType> </item> <item> <title> Re: icm/server_port_0 is in unchangeable mode. How to change? </title> <link> http://scn.sap.com/message/14430774?tstart=0#14430774 </link> <description> <!-- [DocumentBodyStart:7d380b66-3cdf-49da-8584-942b80b553d0] --><div class="jive-rendered-content"><p>Hi Rishi,</p><p>Here is the screen shot for GUI as well as host file.</p><p><a href="http://scn.sap.com/servlet/JiveServlet/showImage/2-14430774-296616/Untitled.gif"><img alt="Untitled.gif" class="jive-image jive-image-thumbnail" height="253" onclick="" src="http://scn.sap.com/servlet/JiveServlet/downloadImage/2-14430774-296616/450-253/Untitled.gif" width="450"/></a></p><p>Regards,</p><p>Vishwas</p></div><!-- [DocumentBodyEnd:7d380b66-3cdf-49da-8584-942b80b553d0] --> </description> <pubDate>Fri, 11 Oct 2013 12:27:02 GMT</pubDate> <guid> http://scn.sap.com/message/14430774?tstart=0#14430774 </guid> <dc:creator>Vishwasdeep Mehta</dc:creator> <dc:date>2013-10-11T12:27:02Z</dc:date> <clearspace:dateToText>2013-10-11 下午2:27</clearspace:dateToText> <clearspace:replyCount>1</clearspace:replyCount> <clearspace:objectType>0</clearspace:objectType> </item> <item> <title> Re: icm/server_port_0 is in unchangeable mode. How to change? </title> <link> http://scn.sap.com/message/14430930?tstart=0#14430930 </link> <description> <!-- [DocumentBodyStart:856a7310-5bfc-4e34-a152-b67e54aaa1ca] --><div class="jive-rendered-content"><p>Hi,</p><p>Please past the entry of the host file.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>How do you login to the GUI? Can you also past me the entry of the gui</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Thanks</p><p>Rishi Abrol</p></div><!-- [DocumentBodyEnd:856a7310-5bfc-4e34-a152-b67e54aaa1ca] --> </description> <pubDate>Fri, 11 Oct 2013 12:10:29 GMT</pubDate> <guid> http://scn.sap.com/message/14430930?tstart=0#14430930 </guid> <dc:creator>Rishi Abrol</dc:creator> <dc:date>2013-10-11T12:10:29Z</dc:date> <clearspace:dateToText>2013-10-11 下午2:10</clearspace:dateToText> <clearspace:replyCount>2</clearspace:replyCount> <clearspace:objectType>0</clearspace:objectType> </item> <item> <title> Re: icm/server_port_0 is in unchangeable mode. How to change? </title> <link> http://scn.sap.com/message/14430889?tstart=0#14430889 </link> <description> <!-- [DocumentBodyStart:a09a2a52-54a4-48bf-be84-df82835ddd14] --><div class="jive-rendered-content"><p>Hi Rishi,</p><p>I am working on SAP IDES , currently installed on my laptop with windows server 2008. I have disabled firewall also, but still facing the same problem.</p><p>Regards,</p><p>Vishwas</p></div><!-- [DocumentBodyEnd:a09a2a52-54a4-48bf-be84-df82835ddd14] --> </description> <pubDate>Fri, 11 Oct 2013 11:56:42 GMT</pubDate> <guid> http://scn.sap.com/message/14430889?tstart=0#14430889 </guid> <dc:creator>Vishwasdeep Mehta</dc:creator> <dc:date>2013-10-11T11:56:42Z</dc:date> <clearspace:dateToText>2013-10-11 下午1:56</clearspace:dateToText> <clearspace:replyCount>3</clearspace:replyCount> <clearspace:objectType>0</clearspace:objectType> </item> <item> <title> Re: icm/server_port_0 is in unchangeable mode. How to change? </title> <link> http://scn.sap.com/message/14430873?tstart=0#14430873 </link> <description> <!-- [DocumentBodyStart:6e948b94-f5d0-49d6-8e42-c9528b4a9892] --><div class="jive-rendered-content"><p>Hi,</p><p>First tell me where this server is installed.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>If in different network then you need to ask network team to open port 8044 from server to area where you are accessing the server.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Do you have any remote desktop which is in the network where the server is.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Can you try one more thing replace the host name in the url where eccehp.sap.com</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>If installed on the local desktop try to disable the firewall in that pc in control panel.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Thanks</p><p>Rishi abrol</p></div><!-- [DocumentBodyEnd:6e948b94-f5d0-49d6-8e42-c9528b4a9892] --> </description> <pubDate>Fri, 11 Oct 2013 11:50:43 GMT</pubDate> <guid> http://scn.sap.com/message/14430873?tstart=0#14430873 </guid> <dc:creator>Rishi Abrol</dc:creator> <dc:date>2013-10-11T11:50:43Z</dc:date> <clearspace:dateToText>2013-10-11 下午1:50</clearspace:dateToText> <clearspace:replyCount>4</clearspace:replyCount> <clearspace:objectType>0</clearspace:objectType> </item> <item> <title> Re: icm/server_port_0 is in unchangeable mode. How to change? </title> <link> http://scn.sap.com/message/14430716?tstart=0#14430716 </link> <description> <!-- [DocumentBodyStart:f12664fe-1554-4ef8-86ee-8334a7581e99] --><div class="jive-rendered-content"><p>Hi Rishi,</p><p>TELNET failed.</p><p>What could be the possible reason for failure ...???</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Regards,</p><p>Vishwas</p></div><!-- [DocumentBodyEnd:f12664fe-1554-4ef8-86ee-8334a7581e99] --> </description> <pubDate>Fri, 11 Oct 2013 11:42:44 GMT</pubDate> <guid> http://scn.sap.com/message/14430716?tstart=0#14430716 </guid> <dc:creator>Vishwasdeep Mehta</dc:creator> <dc:date>2013-10-11T11:42:44Z</dc:date> <clearspace:dateToText>2013-10-11 下午1:42</clearspace:dateToText> <clearspace:replyCount>5</clearspace:replyCount> <clearspace:objectType>0</clearspace:objectType> </item> <item> <title> Re: icm/server_port_0 is in unchangeable mode. How to change? </title> <link> http://scn.sap.com/message/14430766?tstart=0#14430766 </link> <description> <!-- [DocumentBodyStart:11b3dd93-fc56-4444-8c1f-a3efed6b0ec4] --><div class="jive-rendered-content"><p>PLEASE RE INSTALL YOUR IDES</p></div><!-- [DocumentBodyEnd:11b3dd93-fc56-4444-8c1f-a3efed6b0ec4] --> </description> <pubDate>Fri, 11 Oct 2013 11:23:38 GMT</pubDate> <guid> http://scn.sap.com/message/14430766?tstart=0#14430766 </guid> <dc:creator>sumer kaushik</dc:creator> <dc:date>2013-10-11T11:23:38Z</dc:date> <clearspace:dateToText>2013-10-11 下午1:23</clearspace:dateToText> <clearspace:objectType>0</clearspace:objectType> </item> <item> <title> Re: icm/server_port_0 is in unchangeable mode. How to change? </title> <link> http://scn.sap.com/message/14430719?tstart=0#14430719 </link> <description> <!-- [DocumentBodyStart:e64ab43d-9c7c-463a-b3b5-5051b8345db7] --><div class="jive-rendered-content"><p>Hi,</p><p>This is Z one can you please try any standard web dynpro.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>like : HAP_MAIN_DOCUMENT</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>another thing what can you please check with your team if port 8044 is open .</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Id there any firewall between the desktop and system eccehp.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>try to do telnet eccehp.sap.com 8044</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Please check if firewall is active if local installation.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Thanks</p><p>Rishi Abrol</p></div><!-- [DocumentBodyEnd:e64ab43d-9c7c-463a-b3b5-5051b8345db7] --> </description> <pubDate>Fri, 11 Oct 2013 11:12:39 GMT</pubDate> <guid> http://scn.sap.com/message/14430719?tstart=0#14430719 </guid> <dc:creator>Rishi Abrol</dc:creator> <dc:date>2013-10-11T11:12:39Z</dc:date> <clearspace:dateToText>2013-10-11 下午1:12</clearspace:dateToText> <clearspace:replyCount>6</clearspace:replyCount> <clearspace:objectType>0</clearspace:objectType> </item> <item> <title> Re: icm/server_port_0 is in unchangeable mode. How to change? </title> <link> http://scn.sap.com/message/14430580?tstart=0#14430580 </link> <description> <!-- [DocumentBodyStart:7e0fc01e-1fde-46a2-95b4-8a0957495fbd] --><div class="jive-rendered-content"><p>Hi Karthikeyan,</p><p>Still problem is not resolved.</p><p>I maintained both parameters but still not able to run my Web dynpro application.</p><p>I also shared the error screenshot which i am facing.</p><p>Regards,</p><p>Vishwas</p></div><!-- [DocumentBodyEnd:7e0fc01e-1fde-46a2-95b4-8a0957495fbd] --> </description> <pubDate>Fri, 11 Oct 2013 10:56:42 GMT</pubDate> <guid> http://scn.sap.com/message/14430580?tstart=0#14430580 </guid> <dc:creator>Vishwasdeep Mehta</dc:creator> <dc:date>2013-10-11T10:56:42Z</dc:date> <clearspace:dateToText>2013-10-11 下午12:56</clearspace:dateToText> <clearspace:objectType>0</clearspace:objectType> </item> <item> <title> Re: icm/server_port_0 is in unchangeable mode. How to change? </title> <link> http://scn.sap.com/message/14430574?tstart=0#14430574 </link> <description> <!-- [DocumentBodyStart:b5011b16-5675-42ae-b9fe-34a8a610382a] --><div class="jive-rendered-content"><p>Hi Rishi,</p><p>Below is error screenshot. I already have entry in host file. But still i m getting the error <img height="16px" src="http://scn.sap.com/1328/images/emoticons/cry.gif" width="16px"/></p><p><a href="http://scn.sap.com/servlet/JiveServlet/showImage/2-14430574-296550/new.gif"><img alt="new.gif" class="jive-image jive-image-thumbnail" height="253" onclick="" src="http://scn.sap.com/servlet/JiveServlet/downloadImage/2-14430574-296550/450-253/new.gif" width="450"/></a></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Regards,</p><p>Vishwas</p></div><!-- [DocumentBodyEnd:b5011b16-5675-42ae-b9fe-34a8a610382a] --> </description> <pubDate>Fri, 11 Oct 2013 10:43:06 GMT</pubDate> <guid> http://scn.sap.com/message/14430574?tstart=0#14430574 </guid> <dc:creator>Vishwasdeep Mehta</dc:creator> <dc:date>2013-10-11T10:43:06Z</dc:date> <clearspace:dateToText>2013-10-11 下午12:43</clearspace:dateToText> <clearspace:replyCount>8</clearspace:replyCount> <clearspace:objectType>0</clearspace:objectType> </item> </channel> </rss>
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无论怎么样 都会有延迟 针对一些一致性要求高的数据 可以读写都从主库 稳妥