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doc-exports/docs/dws/dev/dws_04_1025.html
Lu, Huayi e6fa411af0 DWS DEV 830.201 version 
Reviewed-by: Pruthi, Vineet <vineet.pruthi@t-systems.com>
Co-authored-by: Lu, Huayi <luhuayi@huawei.com>
Co-committed-by: Lu, Huayi <luhuayi@huawei.com>
2024-05-16 07:24:04 +00:00

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<a name="EN-US_TOPIC_0000001809359968"></a><a name="EN-US_TOPIC_0000001809359968"></a>
<h1 class="topictitle1">Support and Constraints</h1>
<div id="body8662426"><p id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_p6718385619">A hybrid data warehouse is compatible with all column-store syntax.</p>
<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_en-us_topic_0000001147483405_en-us_topic_0237121450_table15220169466" frame="border" border="1" rules="all"><caption><b>Table 1 </b>Supported syntax</caption><thead align="left"><tr id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_en-us_topic_0000001147483405_en-us_topic_0237121450_row93303913614"><th align="left" class="cellrowborder" valign="top" width="50%" id="mcps1.3.2.2.3.1.1"><p id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_en-us_topic_0000001147483405_en-us_topic_0237121450_p1333012911616">Syntax</p>
</th>
<th align="left" class="cellrowborder" valign="top" width="50%" id="mcps1.3.2.2.3.1.2"><p id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_en-us_topic_0000001147483405_en-us_topic_0237121450_p203301091769">Supported</p>
</th>
</tr>
</thead>
<tbody><tr id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_en-us_topic_0000001147483405_en-us_topic_0237121450_row73301397619"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.2.2.3.1.1 "><p id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_en-us_topic_0000001147483405_en-us_topic_0237121450_p1833114910610">CREATE TABLE</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.2.2.3.1.2 "><p id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_en-us_topic_0000001147483405_en-us_topic_0237121450_p20331991362">Yes</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_row10881150554"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.2.2.3.1.1 "><p id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_p78821050556">CREATE TABLE LIKE</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.2.2.3.1.2 "><p id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_p5882165175517">Yes</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_en-us_topic_0000001147483405_en-us_topic_0237121450_row1733115917615"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.2.2.3.1.1 "><p id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_en-us_topic_0000001147483405_en-us_topic_0237121450_p183311591964">DROP TABLE</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.2.2.3.1.2 "><p id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_en-us_topic_0000001147483405_en-us_topic_0237121450_p6331191566">Yes</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_en-us_topic_0000001147483405_en-us_topic_0237121450_row113312911619"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.2.2.3.1.1 "><p id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_en-us_topic_0000001147483405_en-us_topic_0237121450_p3331394619">INSERT</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.2.2.3.1.2 "><p id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_en-us_topic_0000001147483405_en-us_topic_0237121450_p133311196610">Yes</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_en-us_topic_0000001147483405_en-us_topic_0237121450_row433115912613"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.2.2.3.1.1 "><p id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_en-us_topic_0000001147483405_en-us_topic_0237121450_p14331491615">COPY</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.2.2.3.1.2 "><p id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_en-us_topic_0000001147483405_en-us_topic_0237121450_p5331169563">Yes</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_en-us_topic_0000001147483405_en-us_topic_0237121450_row17331891064"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.2.2.3.1.1 "><p id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_en-us_topic_0000001147483405_en-us_topic_0237121450_p03311491464">SELECT</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.2.2.3.1.2 "><p id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_en-us_topic_0000001147483405_en-us_topic_0237121450_p17331129763">Yes</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_en-us_topic_0000001147483405_en-us_topic_0237121450_row93311493614"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.2.2.3.1.1 "><p id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_en-us_topic_0000001147483405_en-us_topic_0237121450_p8331129968">TRUNCATE</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.2.2.3.1.2 "><p id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_en-us_topic_0000001147483405_en-us_topic_0237121450_p1633119914613">Yes</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_en-us_topic_0000001147483405_en-us_topic_0237121450_row6331395616"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.2.2.3.1.1 "><p id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_en-us_topic_0000001147483405_en-us_topic_0237121450_p93311091868">EXPLAIN</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.2.2.3.1.2 "><p id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_en-us_topic_0000001147483405_en-us_topic_0237121450_p1833149567">Yes</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_en-us_topic_0000001147483405_en-us_topic_0237121450_row53314914610"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.2.2.3.1.1 "><p id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_en-us_topic_0000001147483405_en-us_topic_0237121450_p6331397613">ANALYZE</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.2.2.3.1.2 "><p id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_en-us_topic_0000001147483405_en-us_topic_0237121450_p2033169562">Yes</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_en-us_topic_0000001147483405_en-us_topic_0237121450_row73311791665"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.2.2.3.1.1 "><p id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_en-us_topic_0000001147483405_en-us_topic_0237121450_p133112911611">VACUUM</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.2.2.3.1.2 "><p id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_en-us_topic_0000001147483405_en-us_topic_0237121450_p163311391614">Yes</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_en-us_topic_0000001147483405_en-us_topic_0237121450_row533119916616"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.2.2.3.1.1 "><p id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_en-us_topic_0000001147483405_en-us_topic_0237121450_p1133139465">ALTER TABLE DROP PARTITION</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.2.2.3.1.2 "><p id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_en-us_topic_0000001147483405_en-us_topic_0237121450_p18331491260">Yes</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_en-us_topic_0000001147483405_en-us_topic_0237121450_row633117914617"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.2.2.3.1.1 "><p id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_en-us_topic_0000001147483405_en-us_topic_0237121450_p143316919610">ALTER TABLE ADD PARTITION</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.2.2.3.1.2 "><p id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_en-us_topic_0000001147483405_en-us_topic_0237121450_p153321291361">Yes</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_en-us_topic_0000001147483405_en-us_topic_0237121450_row63321291166"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.2.2.3.1.1 "><p id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_en-us_topic_0000001147483405_en-us_topic_0237121450_p14332591267">ALTER TABLE SET WITH OPTION</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.2.2.3.1.2 "><p id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_en-us_topic_0000001147483405_en-us_topic_0237121450_p633216919612">Yes</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_row05451417142819"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.2.2.3.1.1 "><p id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_p854521752816">ALTER TABLE DROP COLUMN</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.2.2.3.1.2 "><p id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_p1054511718287">Yes</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_row5470144992814"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.2.2.3.1.1 "><p id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_p1147084918281">ALTER TABLE ADD COLUMN</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.2.2.3.1.2 "><p id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_p447064920289">Yes</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_row12195152514386"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.2.2.3.1.1 "><p id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_p1019522518388">ALTER TABLE ADD NODELIST</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.2.2.3.1.2 "><p id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_p2019572512381">Yes</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_row328484119282"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.2.2.3.1.1 "><p id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_p16284204118287">ALTER TABLE CHANGE OWNER</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.2.2.3.1.2 "><p id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_p13284184162813">Yes</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_row65711643113216"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.2.2.3.1.1 "><p id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_p12572164373216">ALTER TABLE RENAME COLUMN</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.2.2.3.1.2 "><p id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_p1657212439323">Yes</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_en-us_topic_0000001147483405_en-us_topic_0237121450_row1433269969"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.2.2.3.1.1 "><p id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_en-us_topic_0000001147483405_en-us_topic_0237121450_p163322918616">ALTER TABLE TRUNCATE PARTITION</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.2.2.3.1.2 "><p id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_en-us_topic_0000001147483405_en-us_topic_0237121450_p1833239061">Yes</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_en-us_topic_0000001147483405_en-us_topic_0237121450_row14332691667"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.2.2.3.1.1 "><p id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_en-us_topic_0000001147483405_en-us_topic_0237121450_p13321992611">CREATE INDEX</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.2.2.3.1.2 "><p id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_en-us_topic_0000001147483405_en-us_topic_0237121450_p13332694610">Yes</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_en-us_topic_0000001147483405_en-us_topic_0237121450_row2332899610"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.2.2.3.1.1 "><p id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_en-us_topic_0000001147483405_en-us_topic_0237121450_p123321491264">DROP INDEX</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.2.2.3.1.2 "><p id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_en-us_topic_0000001147483405_en-us_topic_0237121450_p18332692614">Yes</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_en-us_topic_0000001147483405_en-us_topic_0237121450_row233299164"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.2.2.3.1.1 "><p id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_en-us_topic_0000001147483405_en-us_topic_0237121450_p163321692611">DELETE</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.2.2.3.1.2 "><p id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_en-us_topic_0000001147483405_en-us_topic_0237121450_p33325916614">Yes</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_en-us_topic_0000001147483405_en-us_topic_0237121450_row11332149361"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.2.2.3.1.1 "><p id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_en-us_topic_0000001147483405_en-us_topic_0237121450_p2033217914611">Other ALTER TABLE syntax</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.2.2.3.1.2 "><p id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_en-us_topic_0000001147483405_en-us_topic_0237121450_p93321391969">Yes</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_en-us_topic_0000001147483405_en-us_topic_0237121450_row933229366"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.2.2.3.1.1 "><p id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_en-us_topic_0000001147483405_en-us_topic_0237121450_p1333249866">ALTER INDEX</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.2.2.3.1.2 "><p id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_en-us_topic_0000001147483405_en-us_topic_0237121450_p63322919617">Yes</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_en-us_topic_0000001147483405_en-us_topic_0237121450_row53321791962"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.2.2.3.1.1 "><p id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_en-us_topic_0000001147483405_en-us_topic_0237121450_p203321191260">MERGE</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.2.2.3.1.2 "><p id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_en-us_topic_0000001147483405_en-us_topic_0237121450_p19332139462">Yes</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_en-us_topic_0000001147483405_en-us_topic_0237121450_row533299664"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.2.2.3.1.1 "><p id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_en-us_topic_0000001147483405_en-us_topic_0237121450_p113321791060">SELECT INTO</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.2.2.3.1.2 "><p id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_en-us_topic_0000001147483405_en-us_topic_0237121450_p13332191861">Yes</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_en-us_topic_0000001147483405_en-us_topic_0237121450_row19332391963"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.2.2.3.1.1 "><p id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_en-us_topic_0000001147483405_en-us_topic_0237121450_p153321895613">UPDATE</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.2.2.3.1.2 "><p id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_en-us_topic_0000001147483405_en-us_topic_0237121450_p1933239666">Yes</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_en-us_topic_0000001147483405_en-us_topic_0237121450_row1033217911611"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.2.2.3.1.1 "><p id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_en-us_topic_0000001147483405_en-us_topic_0237121450_p1833389561">CREATE TABLE AS</p>
</td>
<td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.2.2.3.1.2 "><p id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_en-us_topic_0000001209612008_en-us_topic_0000001230799743_en-us_topic_0000001147483405_en-us_topic_0237121450_p6333791162">Yes</p>
</td>
</tr>
</tbody>
</table>
</div>
<div class="section" id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_section47504354523"><h4 class="sectiontitle">Constraints</h4><ol id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_ol138463206535"><li id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_li414814197549">To use HStore tables, use the following parameter settings, or the performance of HStore tables will deteriorate significantly:<p id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_p1235092117542"><a name="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_li414814197549"></a><a name="en-us_topic_0000001490574337_li414814197549"></a><strong id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_b15622955191316">autovacuum_max_workers_hstore=3</strong>, <strong id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_b13733185715135">autovacuum_max_workers=6</strong>, and <strong id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_b893396148">autovacuum=true</strong></p>
</li><li id="EN-US_TOPIC_0000001809359968__en-us_topic_0000001490574337_li199141623125314">Currently, HStore and column storage do not support the use of VACUUM to clear dirty index data, and frequent updates may cause index bloat. This function will be supported in later versions.</li></ol>
</div>
</div>
<div>
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<div class="parentlink"><strong>Parent topic:</strong> <a href="dws_04_1023.html">Hybrid Data Warehouse</a></div>
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