forked from laiweijian4/doc-exports
Lu, Huayi
346ac31da9
Reviewed-by: Pruthi, Vineet <vineet.pruthi@t-systems.com> Reviewed-by: Jiang, Beibei <beibei.jiang@t-systems.com> Co-authored-by: Lu, Huayi <luhuayi@huawei.com> Co-committed-by: Lu, Huayi <luhuayi@huawei.com>
85 lines
6.1 KiB
HTML
85 lines
6.1 KiB
HTML
<a name="EN-US_TOPIC_0000001188521058"></a><a name="EN-US_TOPIC_0000001188521058"></a>
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<h1 class="topictitle1">Hash Indexes</h1>
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<div id="body8662426"><p id="EN-US_TOPIC_0000001188521058__en-us_topic_0238518444_en-us_topic_0237362453_en-us_topic_0214164771_p330274862511"><span id="EN-US_TOPIC_0000001188521058__text10892754124514">GaussDB(DWS)</span> does not support hash indexes. DSC will replace these indexes with normal indexes based on GaussDB features.</p>
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<ol id="EN-US_TOPIC_0000001188521058__en-us_topic_0238518444_en-us_topic_0237362453_en-us_topic_0214164771_ol12553123692615"><li id="EN-US_TOPIC_0000001188521058__en-us_topic_0238518444_en-us_topic_0237362453_en-us_topic_0214164771_li15553183615265">Inline hash index<p id="EN-US_TOPIC_0000001188521058__en-us_topic_0238518444_en-us_topic_0237362453_en-us_topic_0214164771_p135691921172717"><a name="EN-US_TOPIC_0000001188521058__en-us_topic_0238518444_en-us_topic_0237362453_en-us_topic_0214164771_li15553183615265"></a><a name="en-us_topic_0238518444_en-us_topic_0237362453_en-us_topic_0214164771_li15553183615265"></a><strong id="EN-US_TOPIC_0000001188521058__en-us_topic_0237712407_b1981334164712">Input</strong></p>
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<pre class="screen" id="EN-US_TOPIC_0000001188521058__en-us_topic_0238518444_en-us_topic_0237362453_en-us_topic_0214164771_screen182799185276">CREATE TABLE `public`.`test_create_table03` (
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`DEMAND_ID` INT(11) NOT NULL AUTO_INCREMENT,
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`DEMAND_NAME` CHAR(100) NOT NULL,
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`THEME` VARCHAR(200) NULL DEFAULT NULL,
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`SEND_ID` INT(11) NULL DEFAULT NULL,
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`SEND_NAME` CHAR(20) NULL DEFAULT NULL,
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`SEND_TIME` DATETIME NULL DEFAULT NULL,
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`DEMAND_CONTENT` TEXT NOT NULL,
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PRIMARY KEY(`DEMAND_ID`),
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INDEX CON_INDEX(DEMAND_CONTENT(100)) USING HASH ,
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INDEX SEND_INFO_INDEX USING HASH (SEND_ID,SEND_NAME(10),SEND_TIME)
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);</pre>
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<p id="EN-US_TOPIC_0000001188521058__en-us_topic_0238518444_en-us_topic_0237362453_en-us_topic_0214164771_p77858251279"><strong id="EN-US_TOPIC_0000001188521058__en-us_topic_0237712407_b1981304204719">Output</strong></p>
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<pre class="screen" id="EN-US_TOPIC_0000001188521058__en-us_topic_0238518444_en-us_topic_0237362453_en-us_topic_0214164771_screen71919285272">CREATE TABLE "public"."test_create_table03"
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(
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"demand_id" SERIAL NOT NULL,
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"demand_name" CHAR(100) NOT NULL,
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"theme" VARCHAR(200) DEFAULT NULL,
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"send_id" INTEGER(11) DEFAULT NULL,
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"send_name" CHAR(20) DEFAULT NULL,
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"send_time" TIMESTAMP WITHOUT TIME ZONE DEFAULT NULL,
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"demand_content" TEXT NOT NULL,
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PRIMARY KEY ("demand_id")
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)
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WITH ( ORIENTATION = ROW, COMPRESSION = NO )
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NOCOMPRESS
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DISTRIBUTE BY HASH ("demand_id");
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CREATE INDEX "con_index" ON "public"."test_create_table03" ("demand_content");
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CREATE INDEX "send_info_index" ON "public"."test_create_table03" ("send_id","send_name","send_time");</pre>
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</li><li id="EN-US_TOPIC_0000001188521058__en-us_topic_0238518444_en-us_topic_0237362453_en-us_topic_0214164771_li19672194516269">Hash index created by <strong id="EN-US_TOPIC_0000001188521058__en-us_topic_0237712407_b981334124712">ALTER TABLE</strong><p id="EN-US_TOPIC_0000001188521058__en-us_topic_0238518444_en-us_topic_0237362453_en-us_topic_0214164771_p1287443289"><strong id="EN-US_TOPIC_0000001188521058__en-us_topic_0237712407_b581334154713">Input</strong></p>
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<pre class="screen" id="EN-US_TOPIC_0000001188521058__en-us_topic_0238518444_en-us_topic_0237362453_en-us_topic_0214164771_screen9287164132817">CREATE TABLE IF NOT EXISTS `public`.`runoob_alter_test`(
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`dataType1` int NOT NULL AUTO_INCREMENT,
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`dataType2` FLOAT(10,2),
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PRIMARY KEY(`dataType1`)
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)ENGINE=InnoDB DEFAULT CHARSET=utf8;
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ALTER TABLE runoob_alter_test ADD KEY alterTable_addKey_indexType(dataType1) USING HASH;</pre>
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<p id="EN-US_TOPIC_0000001188521058__en-us_topic_0238518444_en-us_topic_0237362453_en-us_topic_0214164771_p142870442811"><strong id="EN-US_TOPIC_0000001188521058__en-us_topic_0237712407_b4814104194710">Output</strong></p>
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<pre class="screen" id="EN-US_TOPIC_0000001188521058__en-us_topic_0238518444_en-us_topic_0237362453_en-us_topic_0214164771_screen19288648288">CREATE TABLE "public"."runoob_alter_test"
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(
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"datatype1" SERIAL NOT NULL,
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"datatype2" FLOAT(10),
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PRIMARY KEY ("datatype1")
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)
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WITH ( ORIENTATION = ROW, COMPRESSION = NO )
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NOCOMPRESS
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DISTRIBUTE BY HASH ("datatype1");
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CREATE INDEX "altertable_addkey_indextype" ON "public"."runoob_alter_test" ("datatype1");</pre>
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</li><li id="EN-US_TOPIC_0000001188521058__en-us_topic_0238518444_en-us_topic_0237362453_en-us_topic_0214164771_li1937655815268">Hash index created by <strong id="EN-US_TOPIC_0000001188521058__en-us_topic_0237712407_b381417474711">CREATE INDEX</strong><p id="EN-US_TOPIC_0000001188521058__en-us_topic_0238518444_en-us_topic_0237362453_en-us_topic_0214164771_p15863552819"><strong id="EN-US_TOPIC_0000001188521058__en-us_topic_0237712407_b8814347473">Input</strong></p>
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<pre class="screen" id="EN-US_TOPIC_0000001188521058__en-us_topic_0238518444_en-us_topic_0237362453_en-us_topic_0214164771_screen758620572815">CREATE TABLE `public`.`test_index_table06` (
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`ID` INT(11) NOT NULL AUTO_INCREMENT,
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`FNAME` VARCHAR(30) NOT NULL,
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`INAME` VARCHAR(30) NOT NULL,
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PRIMARY KEY (`ID`)
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);
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CREATE INDEX FNAME_INDEX ON TEST_INDEX_TABLE06(FNAME(10)) USING HASH;
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CREATE INDEX NAME_01 ON TEST_INDEX_TABLE06(FNAME(10),INAME(10)) USING HASH;</pre>
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<p id="EN-US_TOPIC_0000001188521058__en-us_topic_0238518444_en-us_topic_0237362453_en-us_topic_0214164771_p35869514281"><strong id="EN-US_TOPIC_0000001188521058__en-us_topic_0237712407_b7814154154717">Output</strong></p>
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<pre class="screen" id="EN-US_TOPIC_0000001188521058__en-us_topic_0238518444_en-us_topic_0237362453_en-us_topic_0214164771_screen8586145162813">CREATE TABLE "public"."test_index_table06"
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(
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"id" SERIAL NOT NULL,
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"fname" VARCHAR(30) NOT NULL,
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"iname" VARCHAR(30) NOT NULL,
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PRIMARY KEY ("id")
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)
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WITH ( ORIENTATION = ROW, COMPRESSION = NO )
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NOCOMPRESS
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DISTRIBUTE BY HASH ("id");
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CREATE INDEX "fname_index" ON "public"."test_index_table06" ("fname");
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CREATE INDEX "name_01" ON "public"."test_index_table06" ("fname","iname");</pre>
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</li></ol>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="dws_sct_0013.html">MySQL Syntax Migration</a></div>
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</div>
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</div>
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