《MYSQL數(shù)據(jù)庫(kù)MySQL利用procedure analyse()函數(shù)優(yōu)化表結(jié)構(gòu)》要點(diǎn)：
本文介紹了MYSQL數(shù)據(jù)庫(kù)MySQL利用procedure analyse()函數(shù)優(yōu)化表結(jié)構(gòu)，希望對(duì)您有用。如果有疑問(wèn)，可以聯(lián)系我們。
MYSQL應(yīng)用簡(jiǎn)介
MYSQL應(yīng)用procedure analyse()函數(shù)是MySQL內(nèi)置的對(duì)MySQL字段值進(jìn)行統(tǒng)計(jì)分析后給出建議的字段類(lèi)型.
MYSQL應(yīng)用語(yǔ)法
MYSQL應(yīng)用
procesure analyse(max_elements,max_memory)
MYSQL應(yīng)用max_elements
MYSQL應(yīng)用指定每列非重復(fù)值的最大值,當(dāng)超過(guò)這個(gè)值的時(shí)候,MySQL不會(huì)推薦enum類(lèi)型.
MYSQL應(yīng)用max_memory
MYSQL應(yīng)用analyse()為每列找出所有非重復(fù)值所采用的最大內(nèi)存大小.
MYSQL應(yīng)用實(shí)戰(zhàn)演練
MYSQL應(yīng)用
# 對(duì)t1表所有的列進(jìn)行分析
wing@3306>show create table t1;
+-------+---------------------------------------------------------------------------------------------------------------------------------------------------------+
| Table | Create Table |
+-------+---------------------------------------------------------------------------------------------------------------------------------------------------------+
| t1 | CREATE TABLE `t1` (
`id` int(11) DEFAULT NULL,
`name` varchar(16) DEFAULT NULL,
`score` int(11) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8 |
+-------+---------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)
wing@3306>select * from t1 procedure analyse(4);
+---------------+-----------+-----------+------------+------------+------------------+-------+-------------------------+-------------+--------------------------------+
| Field_name | Min_value | Max_value | Min_length | Max_length | Empties_or_zeros | Nulls | Avg_value_or_avg_length | Std | Optimal_fieldtype |
+---------------+-----------+-----------+------------+------------+------------------+-------+-------------------------+-------------+--------------------------------+
| wing.t1.id | 1 | 200000 | 1 | 6 | 0 | 0 | 100000.5000 | 116099.2790 | MEDIUMINT(6) UNSIGNED NOT NULL |
| wing.t1.name | 000jxc6V | zzznmkcX | 8 | 8 | 0 | 0 | 8.0000 | NULL | CHAR(8) NOT NULL |
| wing.t1.score | 1 | 100 | 1 | 3 | 0 | 0 | 50.4889 | 28.8768 | TINYINT(3) UNSIGNED NOT NULL |
+---------------+-----------+-----------+------------+------------+------------------+-------+-------------------------+-------------+--------------------------------+
3 rows in set (0.14 sec)
MYSQL應(yīng)用總結(jié)
MYSQL應(yīng)用以上就是關(guān)于MySQL中procedure analyse()函數(shù)的全部?jī)?nèi)容了,希望本文的內(nèi)容對(duì)大家的學(xué)習(xí)或者工作能帶來(lái)一定的贊助,如果有疑問(wèn)大家可以留言交流.
維易PHP培訓(xùn)學(xué)院每天發(fā)布《MYSQL數(shù)據(jù)庫(kù)MySQL利用procedure analyse()函數(shù)優(yōu)化表結(jié)構(gòu)》等實(shí)戰(zhàn)技能，PHP、MYSQL、LINUX、APP、JS,CSS全面培養(yǎng)人才。
轉(zhuǎn)載請(qǐng)注明本頁(yè)網(wǎng)址：
http://www.fzlkiss.com/jiaocheng/12938.html
