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chenxiaoxiong
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Reviewed-by: Pruthi, Vineet <vineet.pruthi@t-systems.com> Co-authored-by: chenxiaoxiong <chenxiaoxiong@huawei.com> Co-committed-by: chenxiaoxiong <chenxiaoxiong@huawei.com>
26 lines
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26 lines
3.0 KiB
HTML
<a name="dataartsstudio_03_0071"></a><a name="dataartsstudio_03_0071"></a>
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<h1 class="topictitle1">Why Is Error ORA-01555 Reported During Migration from Oracle to DWS?</h1>
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<div id="body8662426"><div class="section" id="dataartsstudio_03_0071__en-us_topic_0000001163136563_section2492838175616"><h4 class="sectiontitle">Symptom</h4><p id="dataartsstudio_03_0071__en-us_topic_0000001163136563_p769062414571">When CDM is used to migrate Oracle data to DWS, an error is reported, as shown in <a href="#dataartsstudio_03_0071__en-us_topic_0000001163136563_fig1847421211579">Figure 1</a>.</p>
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<div class="fignone" id="dataartsstudio_03_0071__en-us_topic_0000001163136563_fig1847421211579"><a name="dataartsstudio_03_0071__en-us_topic_0000001163136563_fig1847421211579"></a><a name="en-us_topic_0000001163136563_fig1847421211579"></a><span class="figcap"><b>Figure 1 </b>Symptom</span><br><span><img id="dataartsstudio_03_0071__en-us_topic_0000001163136563_image74741412135716" src="en-us_image_0000002234240788.jpg" title="Click to enlarge" class="imgResize"></span></div>
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<p id="dataartsstudio_03_0071__en-us_topic_0000001163136563_p135256025817"></p>
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<div class="section" id="dataartsstudio_03_0071__en-us_topic_0000001163136563_section0328637586"><h4 class="sectiontitle">Cause Analysis</h4><ol id="dataartsstudio_03_0071__en-us_topic_0000001163136563_ol837623810310"><li id="dataartsstudio_03_0071__en-us_topic_0000001163136563_li183764381939">During data migration, if the entire table is queried and the table contains a large amount of data, the query takes a long time.</li><li id="dataartsstudio_03_0071__en-us_topic_0000001163136563_li284834213315">During the query, other users frequently perform the <strong id="dataartsstudio_03_0071__en-us_topic_0000001163136563_b21063170572172">commit</strong> operation.</li><li id="dataartsstudio_03_0071__en-us_topic_0000001163136563_li1263581412519">The RBS (the tablespace used for rollback) of Oracle is small. As a result, the migration task is not complete, the source database has been updated, and the rollback times out.</li></ol>
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<div class="section" id="dataartsstudio_03_0071__en-us_topic_0000001163136563_section11237111922"><h4 class="sectiontitle">Summary and Suggestions</h4><ol id="dataartsstudio_03_0071__en-us_topic_0000001163136563_ol7425759265"><li id="dataartsstudio_03_0071__en-us_topic_0000001163136563_li18425175916617">Reduce the data volume queried each time.</li><li id="dataartsstudio_03_0071__en-us_topic_0000001163136563_li78781681571">Modify the database configurations to increase the RBS of the Oracle database.</li></ol>
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<p id="dataartsstudio_03_0071__en-us_topic_0000001163136563_p11989182512114"></p>
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<div class="parentlink"><strong>Parent topic:</strong> <a href="dataartsstudio_03_0027.html">DataArts Migration (CDM Jobs)</a></div>
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