Introduction In this article, we will show how to perform routine data export from multiple files by a certain mask with help of the Data Import functionality of dbForge Studio for MySQL and how to schedule the recurring execution of the import with Microsoft Task Scheduler. Scenario Suppose, we need to simultaneously import multiple daily […]

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When Tungsten Replicator extracts data, the information that has been extracted is written down into the Tungsten History Log, or THL. These files are in a specific format and they are used to store all of the extracted information in a format that can easily be used to recreate and generate data in a target.

Each transaction from the source is written into the THL as an event, so within a single THL file there will be one or more events stored. For each event, we record information about the overall transaction, as well as then information about the transaction itself. That event can contain one or more statements, or rows, or both. Because we don’t want to get an ever increasing single file, the replicator will also divide up the THL into multiple files to tmake the data easier to manage.

We’ll get down into the details soon, until then, let’s start by looking at the basics of the THL, files and sequence numbers and how to …

… or what I should keep in mind in case of disaster

To retrieve and maintain in SQL format the definition of all tables in a database, is a best practice that we all should adopt. To have that under version control is also another best practice to keep in mind.

While doing that may seem redundant, it can become a life saver in several situations. From the need to review what has historically changed in a table, to knowing who changed what and why… to when you need to recover your data and have your beloved MySQL instance not start…

But let’s be honest, only a few do the right thing, and even fewer keep that information up to date. Given that’s the case, what can we do when we have the need to discover/recover the table structure?

From the beginning, MySQL has used some external files to describe its internal structure.

For instance, if I have a schema named windmills and a table …

This tutorial help to upload files using Laravel 5.7.We will create html form view that upload file into server and save path information into MySQL table. We will use MySQL and php 7 to create file upload functionality. File Upload Using Laravel 5.7 and Mysql Lets create new laravel application using laravel CLI. The Artisan […]

The post How To Upload File in Laravel 5.7 Using MySQL appeared first on Phpflow.com.

In this blog, I will provide a step by step procedure to migrate from on-premise MySQL to Amazon RDS/Aurora using Percona-xtrabackup

Both RDS and Aurora is a DBAAS provided by Amazon. To know more on DBAAS you can view our presentation here.

When you are having a database in size of few GB, it would be very convenient to take a logical backup using a logical backup tool such as Mysqldump or Mydumper and restore it Amazon RDS/Aurora easily. But this is not the case when you are having a data size of a few hundred GB or TB, Where the logical backup and restore is very painful and time-consuming. To overcome this we can use …

Have you been experiencing slow MySQL startup times in GTID mode? We recently ran into this issue on one of our MySQL hosting deployments and set out to solve the problem. In this blog, we break down the issue that could be slowing down your MySQL restart times, how to debug for your deployment, and what you can do to decrease your start time and improve your understanding of GTID-based replication.

How We Found The Problem

We were investigating slow MySQL startup times on a low-end, disk-based MySQL 5.7.21 deployment which had GTID mode enabled. The system was part of a master-slave pair and was under a moderate write load. When restarting during a scheduled maintenance, we …

Queries have to be cached in every heavily loaded database, there is simply no way for a database to handle all traffic with reasonable performance. There are various mechanisms in which a query cache can be implemented. Starting from the MySQL query cache, which used to work just fine for mostly read-only, low concurrency workloads and which has no place in high concurrent workloads (to the extent that Oracle removed it in MySQL 8.0), to external key-value stores like Redis, memcached or CouchBase.

The main problem with using an external dedicated data store (as we would not recommend to use MySQL query cache to anyone) is that this is yet another datastore to manage. It is …

We see sometimes at customers that they have very big InnoDB system tablespace files (ibdata1) although they have set innodb_file_per_table = 1.

So we want to know what else is stored in the InnoDB system tablespace file ibdata1 to see what we can do against this unexpected growth.

First let us check the size of the ibdata1 file:

# ll ibdata1 
-rw-rw---- 1 mysql mysql 109064486912 Dez  5 19:10 ibdata1

The InnoDB system tablespace is about 101.6 Gibyte in size. This is exactly 6'656'768 InnoDB blocks of 16 kibyte block size.

So next we want to analyse the InnoDB system tablespace ibdata1 file. For this we can use the tool innochecksum:

# innochecksum --page-type-summary ibdata1 
Error: Unable to lock file:: ibdata1
fcntl: Resource temporarily unavailable

But... the tool …

We see sometimes at customers that they have very big InnoDB system tablespace files (ibdata1) although they have set innodb_file_per_table = 1.

So we want to know what else is stored in the InnoDB system tablespace file ibdata1 to see what we can do against this unexpected growth.

First let us check the size of the ibdata1 file:

# ll ibdata1 
-rw-rw---- 1 mysql mysql 109064486912 Dez  5 19:10 ibdata1

The InnoDB system tablespace is about 101.6 Gibyte in size. This is exactly 6'656'768 InnoDB blocks of 16 kibyte block size.

So next we want to analyse the InnoDB system tablespace ibdata1 file. For this we can use the tool innochecksum:

# innochecksum --page-type-summary ibdata1 
Error: Unable to lock file:: ibdata1
fcntl: Resource temporarily unavailable

But... the tool …