forked from docs/doc-exports
Lu, Huayi
e6fa411af0
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>
47 lines
9.9 KiB
HTML
47 lines
9.9 KiB
HTML
<a name="EN-US_TOPIC_0000001424322276"></a><a name="EN-US_TOPIC_0000001424322276"></a>
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<h1 class="topictitle1">Change History</h1>
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<div id="body0000001424322276">
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<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" id="EN-US_TOPIC_0000001424322276__table11762185514712" frame="border" border="1" rules="all"><thead align="left"><tr id="EN-US_TOPIC_0000001424322276__row147631555675"><th align="left" class="cellrowborder" valign="top" width="20.57%" id="mcps1.3.1.1.3.1.1"><p id="EN-US_TOPIC_0000001424322276__p1976495513720">Released On</p>
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<th align="left" class="cellrowborder" valign="top" width="79.43%" id="mcps1.3.1.1.3.1.2"><p id="EN-US_TOPIC_0000001424322276__p177641551070">Description</p>
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<tbody><tr id="EN-US_TOPIC_0000001424322276__row7591848180"><td class="cellrowborder" valign="top" width="20.57%" headers="mcps1.3.1.1.3.1.1 "><p id="EN-US_TOPIC_0000001424322276__p1030413233920">2024-04-03</p>
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</td>
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<td class="cellrowborder" valign="top" width="79.43%" headers="mcps1.3.1.1.3.1.2 "><p id="EN-US_TOPIC_0000001424322276__p10304823790">This issue is the third official release, adapts to DWS 8.1.3.325.</p>
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</td>
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</tr>
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<tr id="EN-US_TOPIC_0000001424322276__row1676614552070"><td class="cellrowborder" valign="top" width="20.57%" headers="mcps1.3.1.1.3.1.1 "><p id="EN-US_TOPIC_0000001424322276__p16766155510714">2023-04-28</p>
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</td>
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<td class="cellrowborder" valign="top" width="79.43%" headers="mcps1.3.1.1.3.1.2 "><p id="EN-US_TOPIC_0000001424322276__p87666551177">This issue is the second official release, adapts to DWS 8.1.3.200.</p>
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<ul id="EN-US_TOPIC_0000001424322276__ul196851428289"><li id="EN-US_TOPIC_0000001424322276__li1168514428288">Partition addition and partition table management are supported.PERIOD (interval type) and TTL (interval type) are now available in partition management.</li><li id="EN-US_TOPIC_0000001424322276__li145321348132813">JSON foreign tables are supported.<ol id="EN-US_TOPIC_0000001424322276__ol153921446131712"><li id="EN-US_TOPIC_0000001424322276__li143921746151713">READ ONLY HDFS foreign tables in JSON format are supported.</li><li id="EN-US_TOPIC_0000001424322276__li63926461172">READ ONLY OBS foreign tables in JSON file format are supported.</li></ol>
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</li><li id="EN-US_TOPIC_0000001424322276__li1336756122820">Column-store VACUUM<ol id="EN-US_TOPIC_0000001424322276__ol183835151745"><li id="EN-US_TOPIC_0000001424322276__li138411151044">Added the GUC parameter <strong id="EN-US_TOPIC_0000001424322276__b1889217415385">colvacuum_threshold_scale_factor</strong> to control the minimum ratio of dead tuples in a rewritten file of column-store tables.</li><li id="EN-US_TOPIC_0000001424322276__li57588193417">The <strong id="EN-US_TOPIC_0000001424322276__b144478139237">VACUUM</strong> operation on the primary table is disabled by default. You need to set the <strong id="EN-US_TOPIC_0000001424322276__b4519134917228">colvacuum_threshold_scale_factor</strong> parameter to enable this function.</li></ol>
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</li><li id="EN-US_TOPIC_0000001424322276__li199961564297">The row-store ring buffer is controlled by a switch.<p id="EN-US_TOPIC_0000001424322276__p9316151747"><a name="EN-US_TOPIC_0000001424322276__li199961564297"></a><a name="li199961564297"></a>The ring buffer is controlled by a switch and its threshold is adjustable. Batch update of large tables no longer uses the ring buffer.</p>
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</li><li id="EN-US_TOPIC_0000001424322276__li15645698292">Default storage mode of a table.It is controlled by the parameter <strong id="EN-US_TOPIC_0000001424322276__b14016463171">default_orientation</strong>. If the storage mode is not specified during table creation, this parameter specifies the default storage mode.</li><li id="EN-US_TOPIC_0000001424322276__li879818172918">The GBK character set supports the euro sign.</li><li id="EN-US_TOPIC_0000001424322276__li12898122092914">OBS foreign tables are adapted to XSKY and the parameter <strong id="EN-US_TOPIC_0000001424322276__b1396491423615">eol</strong> is added.</li><li id="EN-US_TOPIC_0000001424322276__li921514277299">SQL supports Roaring Bitmaps.</li><li id="EN-US_TOPIC_0000001424322276__li18437394292">Case-insensitive is supported to improve Teradata compatibility.</li><li id="EN-US_TOPIC_0000001424322276__li8901144882914">List partitioned tables are supported.</li><li id="EN-US_TOPIC_0000001424322276__li145441051182916">Enhanced MySQL compatibility<p id="EN-US_TOPIC_0000001424322276__p19315438962"><a name="EN-US_TOPIC_0000001424322276__li145441051182916"></a><a name="li145441051182916"></a><strong id="EN-US_TOPIC_0000001424322276__b137901716183817">ALTER TABLE </strong>can modify multiple columns at a time.</p>
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<p id="EN-US_TOPIC_0000001424322276__p183151938363"><strong id="EN-US_TOPIC_0000001424322276__b19352195853819">ALTER TABLE</strong> supports <strong id="EN-US_TOPIC_0000001424322276__b36684218395">COMMENT</strong>.</p>
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<p id="EN-US_TOPIC_0000001424322276__p12801247172218"><strong id="EN-US_TOPIC_0000001424322276__b19192142884818">ALTER TABLE</strong> supports <strong id="EN-US_TOPIC_0000001424322276__b1788219552485">CHANGE</strong>, <strong id="EN-US_TOPIC_0000001424322276__b17602002493">DROP KEY</strong>, <strong id="EN-US_TOPIC_0000001424322276__b179657315491">DROP PARTITION</strong>, and <strong id="EN-US_TOPIC_0000001424322276__b1224011012495">FIRST</strong>/<strong id="EN-US_TOPIC_0000001424322276__b161610144493">AFTER</strong>.</p>
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</li><li id="EN-US_TOPIC_0000001424322276__li530361818316">DWS customers have a large number of <strong id="EN-US_TOPIC_0000001424322276__b8958103414180">MERGE INTO</strong> operations on replication tables. Like row-store replication tables, column-store replication tables now support <strong id="EN-US_TOPIC_0000001424322276__b1697917162518">UPDATE</strong>, <strong id="EN-US_TOPIC_0000001424322276__b636331092516">DELETE</strong>, and <strong id="EN-US_TOPIC_0000001424322276__b1184691442519">MERGE INTO</strong> operations.</li><li id="EN-US_TOPIC_0000001424322276__li9418118173519">Fine-grained permission management<p id="EN-US_TOPIC_0000001424322276__p1242261412586"><a name="EN-US_TOPIC_0000001424322276__li9418118173519"></a><a name="li9418118173519"></a>Added the <strong id="EN-US_TOPIC_0000001424322276__b115894113282">ALTER</strong>, <strong id="EN-US_TOPIC_0000001424322276__b13532859132811">DROP</strong> and <strong id="EN-US_TOPIC_0000001424322276__b251916542913">VACUUM</strong> permissions at table level.</p>
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<p id="EN-US_TOPIC_0000001424322276__p610720163584">Added the <strong id="EN-US_TOPIC_0000001424322276__b94421816153011">ALTER</strong> and <strong id="EN-US_TOPIC_0000001424322276__b16442161643010">DROP</strong> permissions at schema level.</p>
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<p id="EN-US_TOPIC_0000001424322276__p867510179587">Add the preset roles <strong id="EN-US_TOPIC_0000001424322276__b1073155812304">role_signal_backend</strong> and <strong id="EN-US_TOPIC_0000001424322276__b739818319314">role_read_all_stats</strong>.</p>
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</li><li id="EN-US_TOPIC_0000001424322276__li196212455716">Added the distributed view<strong id="EN-US_TOPIC_0000001424322276__b6275122614146"> pg_session_wlmstat</strong>.</li><li id="EN-US_TOPIC_0000001424322276__li16549101717401">Added the GUC parameter <strong id="EN-US_TOPIC_0000001424322276__b16494542114019">log_clean_strategy</strong> for CM cluster log compression and clearance.</li><li id="EN-US_TOPIC_0000001424322276__li664415213403">Modified partition table features<p id="EN-US_TOPIC_0000001424322276__p77391132195414"><a name="EN-US_TOPIC_0000001424322276__li664415213403"></a><a name="li664415213403"></a>Changed the limit on the number of boundary values: The number of partitions in a partition table cannot exceed 32767, and the number of boundary values of all partitions cannot exceed 32767.</p>
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<p id="EN-US_TOPIC_0000001424322276__p10900134175414">The default partition creation policy is modified. When a partition table is created, two default partitions are created. The partition time range of the two default partitions is <strong id="EN-US_TOPIC_0000001424322276__b974651195816">PERIOD</strong>.</p>
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</li><li id="EN-US_TOPIC_0000001424322276__li12788445134117">Added the function of returning NULL when the divisor is 0.<p id="EN-US_TOPIC_0000001424322276__p10704123411282"><a name="EN-US_TOPIC_0000001424322276__li12788445134117"></a><a name="li12788445134117"></a>Specifies whether to report an error when the divisor is 0 in MySQL compatibility mode. The compatibility configuration item <strong id="EN-US_TOPIC_0000001424322276__b3144142018157">enable_division_by_zero_mysql</strong> is added to the <strong id="EN-US_TOPIC_0000001424322276__b296303321517">behavior_compat_options</strong> parameter.</p>
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</li><li id="EN-US_TOPIC_0000001424322276__li1533616525416">Added the GUC parameter <strong id="EN-US_TOPIC_0000001424322276__b8548108172216">ddl_lock_timeout</strong>, which specifies the DDL lock timeout interval.</li><li id="EN-US_TOPIC_0000001424322276__li1739105513414">Enhanced the view <strong id="EN-US_TOPIC_0000001424322276__b464119206550">PG_LOCKS</strong>.<p id="EN-US_TOPIC_0000001424322276__p16859113265316">Added the views <strong id="EN-US_TOPIC_0000001424322276__b544573252410">PGXC_WAIT_DETAIL</strong> and <strong id="EN-US_TOPIC_0000001424322276__b512154192419">PGXC_LOCKWAIT_DETAIL</strong>.</p>
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<p id="EN-US_TOPIC_0000001424322276__p1816910352535">Add columns such as <strong id="EN-US_TOPIC_0000001424322276__b134441350122416">wait_on_pid</strong> and <strong id="EN-US_TOPIC_0000001424322276__b28972053112416">query_id</strong>.</p>
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</li></ul>
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</td>
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</tr>
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<tr id="EN-US_TOPIC_0000001424322276__row14766145516710"><td class="cellrowborder" valign="top" width="20.57%" headers="mcps1.3.1.1.3.1.1 "><p id="EN-US_TOPIC_0000001424322276__p1376613552712">2022-11-17</p>
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</td>
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<td class="cellrowborder" valign="top" width="79.43%" headers="mcps1.3.1.1.3.1.2 "><p id="EN-US_TOPIC_0000001424322276__p076618551574">This issue is the first official release, adapts to DWS 8.1.1.202.</p>
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</td>
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</tr>
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</tbody>
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</table>
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</div>
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<p id="EN-US_TOPIC_0000001424322276__p8060118"></p>
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</div>
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