Mysql 嵌套集模型优化
我有一个网站,包含约10万页(200-300个并发用户)。每个页面在mysql InnoDB表中都有自己的记录-页面: 如您所见,我使用嵌套集模型来显示页面的层次结构等。。除了INSERT、UPDATE和DELETE语句的性能外,一切似乎都很好。将页面从一个父级移动到另一个父级非常慢,有时需要约30秒(!!) 硬件:四核Q6600(4x2.40+GHz),4GB RAM 谢谢你的建议 编辑: 表页如下所示:Mysql 嵌套集模型优化,mysql,model,nested,set,Mysql,Model,Nested,Set,我有一个网站,包含约10万页(200-300个并发用户)。每个页面在mysql InnoDB表中都有自己的记录-页面: 如您所见,我使用嵌套集模型来显示页面的层次结构等。。除了INSERT、UPDATE和DELETE语句的性能外,一切似乎都很好。将页面从一个父级移动到另一个父级非常慢,有时需要约30秒(!!) 硬件:四核Q6600(4x2.40+GHz),4GB RAM 谢谢你的建议 编辑: 表页如下所示: CREATE TABLE `page` ( `page_id` int(10) un
CREATE TABLE `page` (
`page_id` int(10) unsigned NOT NULL AUTO_INCREMENT,
`page_parent` int(10) unsigned DEFAULT NULL,
`left_id` int(11) NOT NULL,
`right_id` int(11) NOT NULL,
`page_module` smallint(5) unsigned NOT NULL,
`page_connector` smallint(5) unsigned NOT NULL,
`page_subject` varchar(255) NOT NULL,
`page_title` varchar(255) DEFAULT NULL,
`page_path` varchar(255) NOT NULL,
`page_text` int(10) unsigned DEFAULT NULL,
`page_children` mediumint(8) unsigned NOT NULL,
`page_depth` smallint(5) unsigned NOT NULL DEFAULT '0',
`page_content` tinyint(3) unsigned NOT NULL,
`page_publish` tinyint(1) unsigned NOT NULL DEFAULT '1',
`page_published` datetime DEFAULT NULL,
`page_unpublished` datetime DEFAULT NULL,
`page_time` int(10) unsigned NOT NULL,
`page_edit_time` int(10) unsigned NOT NULL,
`page_delete` tinyint(1) unsigned NOT NULL DEFAULT '0',
`page_richtext` tinyint(1) unsigned NOT NULL DEFAULT '0',
`page_cache` tinyint(1) unsigned NOT NULL DEFAULT '1',
`page_template` varchar(255) NOT NULL,
PRIMARY KEY (`page_id`),
KEY `page_parent` (`page_parent`),
KEY `left_id` (`left_id`),
KEY `right_id` (`right_id`),
KEY `page_depth` (`page_depth`),
KEY `page_path` (`page_path`),
KEY `page_connector` (`page_connector`),
KEY `page_text` (`page_text`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
作为第一步,确保您有单独的索引 页码号 家长 左id,右id 右图 编辑 从page_parent=0的页面中选择MAX(right_id)进入DSTLefID 通过在(第\页父项,右\ id)上设置和索引,可以加快上述查询的速度
除此之外,如果不更全面地了解系统并可能修改其工作方式,我真的不能提出太多建议。你能发布表的结构吗,它会有帮助,特别是索引。啊,嵌套集合的乐趣——也许有了好的旧邻接列表,事情会简单一些??我添加了表格的完整结构。也许有一种不同的方法可以将页面从一个节点移动到另一个节点?我有以下索引:page\u id、page\u parent、left\u id、right\u id。我应该在(left\u id、right\u id)和right\u id上设置单独的索引吗?您会多次出现“WHERE left\u id=-srcRightId;”,所以我会说您需要(left\u id、right\u id)和right\u id作为两个单独的索引。您是否尝试过执行单个查询以查看哪个(如果有的话)特别慢?当我们必须更新大量数据时,表“page”上的每个UPDATE语句都很慢,MySQL必须更新它们的表索引:/n无论如何,这是嵌套集模型的缺点:(工作正常,直到我们必须插入新记录作为某个节点的子节点。
CREATE PROCEDURE `PAGE_MOVE`(IN `pageSrc` INT, IN `pageDst` INT)
LANGUAGE SQL
NOT DETERMINISTIC
CONTAINS SQL
SQL SECURITY DEFINER
COMMENT ''
BEGIN
DECLARE srcLeftId INT;
DECLARE srcRightId INT;
DECLARE dstLeftId INT;
DECLARE dstRightId INT;
DECLARE width INT;
SELECT left_id, right_id, right_id - left_id + 1
INTO srcLeftId, srcRightId, width
FROM page
WHERE page_id = pageSrc;
IF pageDst > 0 THEN
SELECT left_id, right_id
INTO dstLeftId, dstRightId
FROM page
WHERE page_id = pageDst;
ELSE
SELECT MAX(right_id) INTO dstLeftId FROM page WHERE page_parent = 0;
SET dstRightId = dstLeftId + 1;
END IF;
IF dstLeftId > 0 THEN
UPDATE page SET page_children = page_children - (width / 2)
WHERE left_id < srcLeftId AND right_id > srcRightId;
UPDATE page SET page_children = page_children + (width / 2)
WHERE left_id <= dstLeftId AND right_id >= dstRightId;
/**
* Set nagative values to left_id and right_id (temporary)
*/
UPDATE page
SET left_id = -left_id, right_id = -right_id
WHERE left_id >= srcLeftId AND right_id <= srcRightId;
UPDATE page SET left_id = left_id - width WHERE left_id > srcLeftId;
UPDATE page SET right_id = right_id - width WHERE right_id > srcRightId;
UPDATE page SET left_id = left_id + width
WHERE left_id >= IF(dstRightId > srcRightId, dstRightId - width, dstRightId);
UPDATE page SET right_id = right_id + width
WHERE right_id >= IF(dstRightId > srcRightId, dstRightId - width, dstRightId);
SET @diff = IF(dstRightId > srcRightId, dstRightId - srcRightId -1, dstRightId - srcRightId - 1 + width);
UPDATE page
SET left_id = -left_id + @diff,
right_id = -right_id + @diff
WHERE left_id <= -srcLeftId AND right_id >= -srcRightId;
/**
* Set parent_id and page_depth
*/
UPDATE page SET page_parent = pageDst, page_depth = GET_PAGE_DEPTH(page_id) WHERE page_id = pageSrc;
/**
* Update page_depth in children's nodes
*/
IF width > 2 THEN
SELECT left_id, right_id
INTO srcLeftId, srcRightId
FROM page
WHERE page_id = pageSrc;
UPDATE page
SET page_depth = GET_PAGE_DEPTH(page_id)
WHERE left_id >= srcLeftId AND right_id <= srcRightId;
END IF;
END IF;
END
CREATE FUNCTION `GET_PAGE_DEPTH`(`pageId` MEDIUMINT UNSIGNED)
RETURNS smallint(6)
LANGUAGE SQL
DETERMINISTIC
READS SQL DATA
SQL SECURITY DEFINER
COMMENT ''
BEGIN
RETURN (
SELECT COUNT(*) -1 AS depth
FROM page AS parent
INNER JOIN page AS node ON node.page_id = pageId
WHERE node.left_id BETWEEN parent.left_id AND parent.right_id
);
END
CREATE TABLE `page` (
`page_id` int(10) unsigned NOT NULL AUTO_INCREMENT,
`page_parent` int(10) unsigned DEFAULT NULL,
`left_id` int(11) NOT NULL,
`right_id` int(11) NOT NULL,
`page_module` smallint(5) unsigned NOT NULL,
`page_connector` smallint(5) unsigned NOT NULL,
`page_subject` varchar(255) NOT NULL,
`page_title` varchar(255) DEFAULT NULL,
`page_path` varchar(255) NOT NULL,
`page_text` int(10) unsigned DEFAULT NULL,
`page_children` mediumint(8) unsigned NOT NULL,
`page_depth` smallint(5) unsigned NOT NULL DEFAULT '0',
`page_content` tinyint(3) unsigned NOT NULL,
`page_publish` tinyint(1) unsigned NOT NULL DEFAULT '1',
`page_published` datetime DEFAULT NULL,
`page_unpublished` datetime DEFAULT NULL,
`page_time` int(10) unsigned NOT NULL,
`page_edit_time` int(10) unsigned NOT NULL,
`page_delete` tinyint(1) unsigned NOT NULL DEFAULT '0',
`page_richtext` tinyint(1) unsigned NOT NULL DEFAULT '0',
`page_cache` tinyint(1) unsigned NOT NULL DEFAULT '1',
`page_template` varchar(255) NOT NULL,
PRIMARY KEY (`page_id`),
KEY `page_parent` (`page_parent`),
KEY `left_id` (`left_id`),
KEY `right_id` (`right_id`),
KEY `page_depth` (`page_depth`),
KEY `page_path` (`page_path`),
KEY `page_connector` (`page_connector`),
KEY `page_text` (`page_text`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;