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Displaying posts with tag: MySQL 8.0 (reset)
MySQL load data infile made faster .

Loading any large file into MySQL server using the LOAD DATA INFILE is a time consuming process , because it is single threaded and it is a single transaction too. But with modern hardwares system resource is not a bottle neck. At Mydbops we focus on improving the efficiency of process as we value performance more. MySQL introduced the parallel load data operations in its latest minor release MySQL 8.0.17 . I had the curiosity to test this feature and wanted to know, how it can improve the data loading comparing to the existing single threaded method  . Through this blog I am going to  compare the both methods .

Remember you can use the parallel data loading utility only via MySQL Shell .

Internal Work Flow :

This section describes the …

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MySQL 8.0 Clone Plugin and its internal process.

MySQL 8 has recently released clone plugin which makes DBA’s task of rebuilding the DB servers more easy.

  • Cloning is a process of creating an exact copy of the original. In technical terms cloning alias to (Backup + Recovery), MySQL database cloning requires a sequence of actions to be performed manually or in a scripted fashion with and without the tools involved.
  • Cloning is the first step when you want to configure the replication slave or Joining a new server to the InnoDB cluster. There was no native support for auto provisioning earlier. Percona XtraDB Cluster (MySQL + Galera Cluster) does cloning using xtrabackup tool by default when a new node joins the cluster.
  • Now MySQL simplified this task, In this post, We will see how to clone the database using clone plugin and its internals.
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How to integrate ProxySQL in MySQL InnoDB Cluster

MySQL InnoDB Cluster is the most easy and integrated High Availability solution for MySQL.

The solution is composed of:

  • MySQL Server
  • MySQL Group Replication Plugin
  • MySQL Clone Plugin
  • MySQL Router
  • MySQL Shell

All those components are developed and tested together to provide the easiest and best experience to the MySQL users.

As the MySQL Router is a TCP Level 4 router (like HA Proxy), some users requiring a more “intelligent” proxy having other extra features like caching, read/write splitting in relation with the user or SQL, firewall, … may be interested in using ProxySQL… and this is a good choice !

ProxySQL / MySQL Router in OSI Model

However, even is ProxySQL supports MysQL Group Replication, for …

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Create MySQL Test Instance with Oracle Cloud Free Tier

Tweet

Oracle announced this week at Oracle OpenWorld that it has introduced a new cloud offer called Oracle Cloud Free Tier. As the name suggest, it allows you to run a few limited instances in Oracle Cloud for free. I will in this blog show how you can use the free tier to setup a MySQL test instance.

Tip

If you want to read more about Oracle Cloud Free Tier see https://www.oracle.com/cloud/free/ and the FAQ at https://www.oracle.com/cloud/free/faq.html.

The first step is to sign up for the cloud service which you do by opening …

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Join the Code ONE MySQL Track at Oracle Open World in San Francisco

Mid September, MySQL Community, MySQL Customers and MySQL Engineers will be in San Francisco to share their experience and present the new features of your favorite database !

The event will be held in Moscone South (just Mirko Ortensi‘s Hands-on Lab will be delivered in Moscone West).

During the week, the MySQL Community Team will host the traditional MySQL Reception. We got so great feedback from last year that we decided to renew the experience in the same awesome location, the Samovar Tea Lounge at Yerba Buena Gardens. Don’t forget that you need to register for this reception but no OOW pass is required. Please register here !

Back to the conference, you can find the full schedule for the session in the …

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MySQL 8.0 Flow Control in Group Replication

We are well aware that MySQL Group Replication is one of the faster evolving clustering Technology for MySQL. Flow Control plays a key factor in Group Replication performance and data integrity . In this blog I am going to explain about the Flow Control mechanism and How it has evolved in MySQL 8 ?

What is Flow Control ?

MySQL Group Replication / Native Async replication needs binary logs to get the data flow across the servers.

What makes the difference ?

In the MySQL Group Replication we are trying to achieve the Synchronous replication with the help of a Flow Control mechanism and transaction acknowledgments ( certification ).

Without Flow Control, the MySQL Group Replication is asynchronous replication ? Yes, consistency is lost.

Lets us consider

We have three nodes ( GR1, GR2, GR3 ) . Gr1 is the master and and other two servers ( GR2, GR3 ) are the …

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MySQL 8.0: if I should optimize only one query on my application, which one should it be ?

Answering this question is not easy. Like always, the best response is “it depends” !

But let’s try to give you all the necessary info the provide the most accurate answer. Also, may be fixing one single query is not enough and looking for that specific statement will lead in finding multiple problematic statements.

The most consuming one

The first candidate to be fixed is the query that consumes most of the execution time (latency). To identify it, we will use the sys schema and join it with events_statements_summary_by_digest from performance_schemato retrieve a real example of the query (see this post for more details).

Let’s take a look at what sys schema has to offer us related to our mission:

> show tables like …
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MySQL 8.0 Memory Consumption on Small Devices

Recently, PeterZ pointed a huge difference in memory usage of MySQL 8.0 compare to MySQL 5.7. This can be an issue for small instances if the same configuration for buffers like the buffer pool are not changed.

As explained in Peter’s article, this can lead to the awakening of the so feared OOM Killer !

MorganT, pointed accurately in his comment what is the source of such difference and how this was then caused by the new instrumentation added in MySQL 8.0.

Nothing is free, even as a …

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Migrate from a single MySQL Instance to MySQL InnoDB Cluster using CLONE plugin

When somebody wants to migrate from a single MySQL instance to a full HA solution using MySQL InnoDB Cluster, the best solution to reduce the downtime is to use asynchronous replication and switch database only once at a certain point in time when everything is ready. This is almost what I explained already in this post.

The most difficult part was related to the provisioning of the existing data to the new cluster members. A backup (physical or logical) was required. It should have been restored on every nodes and we had to be sure to not mess up with the GTIDs.

This is not more the case since MySQL 8.0.17 ! Now we can use the CLONE plugin to start the cluster provisioning too.

The current situation

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MySQL 8.0 and wrong dates

In MySQL 8.0, when using invalid values for date data types, an error is returned. This was not the case in 5.x versions.

Let’s have a look using the table definition of bug 96361:

CREATE TABLE `new_table` (
  `id_table` int(11) NOT NULL AUTO_INCREMENT,
  `text_table` varchar(45) DEFAULT NULL,
  `date_table` date DEFAULT NULL,
  PRIMARY KEY (`id_table`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci

Now we can try the following statement in MySQL 5.7 and MySQL 8.0:

MySQL 5.7.26> SELECT id_table, text_table 
              FROM new_table WHERE date_table = '' OR date_table IS NULL;
Empty set, 1 warning (0.01 sec)

MySQL 5.7.26> show warnings;
+---------+------+-----------------------------------------------------------+
| Level   | Code | Message                                                   | …
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