多年來，一種選擇當然是Giuseppe Maxia的https://mysqlsandbox.net/ 。 這是一個非常有效的解決方案，能夠啟動多個實例並測試複製等。
在跨不同版本的MySQL進行測試時，Docker現在也是另一個經常使用的場景。 下面僅介紹一些步驟，以輕鬆安裝多個版本。 我使用OSX，因此這些示例適用於OSX。
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MySQL 的 innodb 引擎之所以使用 B+tree 来存储索引，就是想尽量减少数据查询时磁盘 IO 次数。树的高度直接影响了查询的性能。一般树的高度在 3~4 层较为适宜。数据库分表的目的也是为了控制树的高度。那么如何获取树的高度呢？下面使用一个示例来说明如何获取树的高度。
CREATETABLE`user` ( `id` int(11) NOTNULLAUTO_INCREMENT, `name` varchar(100) CHARACTERSETlatin1 DEFAULTNULL, `age` int(11) DEFAULTNULL, PRIMARYKEY(`id`), KEY`name` (`name`), KEY`age` (`age`) ) ENGINE=InnoDB DEFAULTCHARSET=utf8
mysql> select* fromuserlimit 2\G *************************** 1. row *************************** id: 110000 name: ab age: 100 *************************** 2. row *************************** id: 110001 name: ab age: 100 2 …[获取更多]
In the past, getting a home insurance quote would involve calling your existing insurer, managing your representative, as well as taking whatever price was supplied to you. Music artists can get an online residence insurance quote with loved one ease nowadays. What’s more, you can get numerous quotes from several insurance firms. This puts you at a substantial advantage, enabling you to purchase the best readily available house insurance policy quote. As well as indeed this can also be done for occupants insurance coverage, automobile insurance, or for whatever various other insurance needs you might have.
Currently, this is all offered to us, thanks to the advancements of the internet. It is necessary to comprehend, however, that the removal of an agent, suggests a bit more research on your part. Points may be less costly as well as much more accessible by making use of the power of the internet, yet you’ll be missing out on guidance …[获取更多]
Twitter! The most important and most common platform, where most of the educators tend to learn for their professional development and training. It is basically a social networking microblogging service that allows you to send anecdote message/short messages mainly known as tweets! The twitter transfer news contains text and links, the basic tweet consists of only 140 characters, but has recently increased upto 280 characters.
Twitter is a platform where you can just lurk, by reading others’ tweets, or contribute by sending out your own tweets and the latter is what you work towards as the more you put in, the more you get out!
Also the highlight suggests that you can read tweets without having your own Twitter account as long as the accounts you are following are public.
Anatomy of Tweet!
One of the greatest things about Twitter is that it is …[获取更多]
Commercial, residential property listings are also displayed online for music artists; however, aggregated commercial property information is extra elusive. Most of the times, for-sale-by-owner homes cannot be straight added to an MLS as well as CIE, which are usually preserved by realtor associations. The lack of a managed, centralized database can make these homes more challenging to locate. Traditionally, these residential or commercial properties are found by driving around or looking for advertisements in the neighbourhood newspaper’s real estate listings. An extra reliable means to situate for-sale-by-owner features is to look for a for-sale-by-owner website in the geographical location.
What is a real estate agent? Occasionally the terms realty agent and realtor are utilized mutually; however, they are not the same. A real estate professional is an accredited property agent that is additionally a member of the national association …[获取更多]
Season X of fortnight has recently kicked in and things are getting totally wild and wacky! With the returning of dusty depot is typically annoying and the fly won’t buzz off. An enormous mechs called Brutes are new player-controlled vehicles which can cause some serious destruction. Fortnite’s X season has also been hitting fortnite twitter welcomning about the most awaited season of all time!
Fortnite Tips and Tricks To Follow!
If you are a newbie to the fortnite battle then you will surely be looking at the various pointers to get started. It is true that every new season comes up with a new map, and it has been significantly changing and evolving. Epic has done with the way along with russia gosloto morning results at twitter discussing about the old battle pass challenges in favour of Fortnite Missions which is similar but rather than being called Week One, Week Two, etc. Each one of them now consists …[获取更多]
South African hip-hop music has been the most famous and high in
demand when it comes to talking about mzansi house music facebook
album. It absorbs the wide variety of regional and international
influences. South African house music is informed by jazz and
traditional African music along with the contemporary dance and
pop trends. From upbeat basslines to chill downtempo beats, these
are the hottest new tracks filling Mzansi’s dance floors. The
editors regularly update their playlist if you hear something you
like, you would not stop without adding it to your library.
The List Of Few Top Mzansi House Music Artists:
- Liquideep: A typical multi-award winning duo filled with ambition along with talent and appeal on the dance and have a soulful vocal house music.
- OSKIDO: Oscar Mdlongwa has been given many affectionate nicknames over the years, including Oscar “Warona” (which means …
如果您丟失了ibd文件......您將丟失數據。 因此，如果您有一個可用的副本..或者即使您從另一個數據庫同步，您仍然可以導入它。 什麼/你如何失去表空間？
mysql> Create database demo;
mysql> use demo;
mysql> CREATE TABLE `demotable` (
-> `id` int(11) NOT NULL AUTO_INCREMENT,
-> `dts` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
-> PRIMARY KEY (`id`)
-> ) ENGINE=InnoDB;
mysql> INSERT INTO demotable (id) VALUES (NULL);
Query OK, 1 row affected (0.10 …
以下是場景：在午夜進行備份，他們使用每個數據庫的MySQL轉儲。 然後在第二天上午十點數據庫崩潰。 在我被調用之前發生了一系列事件，但他們把它帶到了MyISAM表的數據庫版本和表空間中缺少的IBD文件。
所以選項1，從備份恢復會讓我們到午夜，我們會丟失數小時的數據。 選項2，我們重新導入1000的ibd文件並保留所有內容。 然後我們有選項3，從備份恢復，然後應用binlogs進行最近的更改。
為了使它更有趣，他們沒有我被告知的所有ibd文件，我確實看到一些丟失。 所以不確定這是怎麼可能的，但是選項2變成了無效選項。 當然，他們希望盡可能減少數據丟失，因此我們選擇了3。
所以MySQL的組複製出來了MySQL 5.7。 現在已經有一段時間了，人們開始更多地詢問它。
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