Monthly Archives: April 2023

A solution to running out of memory while executing mysqldump

 in Applications  tagged /etc/fstab / /proc/meminfo / /proc/swaps / dd / fstab / mysql / mysqldump / swapon by

Are you trying to perform a mysqldump on a large table and running out of memory every time? This can be a frustrating experience. Even if you try to use the –quick parameter, you may still run out of memory. In this blog post, we will discuss a solution to this problem.

One option is to create a swap file to add more swap space. A swap file differs from a swap partition but can be accessible and dynamic. In the following steps, we will show you how to create a swap file.

First, create an empty file. This file will contain virtual memory contents, so make sure to create a file big enough for your needs. The following command will create a 1GiB file, which means +1GiB swap space for your system:

dd if=/dev/zero of=/media/tux/bigdisk/swapfile.img bs=1024 count=1M;

If you want to create a 3GiB file, change the count value to count=3M. Refer to the man dd for more information.

Next, make a “swap filesystem” inside your new swap file using the following command:

mkswap /media/tux/bigdisk/swapfile.img;
chmod 600 /media/tux/bigdisk/swapfile.img;
chown root:root /media/tux/bigdisk/swapfile.img;

To ensure that your new swap space is activated while booting up your computer, add it to the filesystem configuration file /etc/fstab. Add the following line to the end of the file:

/media/tux/bigdisk/swapfile.img swap swap sw 0 0

This is recommended because other filesystems (at least one that contains a swap file) must be mounted in read-write mode before we can access any files.

Finally, you can either reboot your computer or activate the new swap file manually with the following command:

swapon /media/tux/bigdisk/swapfile.img;

If everything goes well, you should see that more swap space is available for use. You can use the following commands to check your new swap and confirm that it is active:

cat /proc/swaps;

This should display something like:

Filename                           Type       Size    Used    Priority
/swapfile                          file       16777212 1048796    -2
/media/tux/bigdisk/swapfile.img    file       67108860 0          -3

You can also use the following command to check your swap usage:

grep 'Swap' /proc/meminfo;

This should display something like:

SwapCached:         132456 kB
SwapTotal:        83886072 kB
SwapFree:         82837276 kB

Creating a swap file can be an effective solution to running out of memory while performing a mysqldump on a large table. It is a simple, dynamic solution that can be implemented easily on most Linux systems. Following the steps outlined in this post, you should be able to create a swap file and add more swap space to your system.

dbeaver: native client is not specified for connection

 in Applications  tagged dbeaver / mysql / mysqldump by

If you’re using DBeaver to perform a database dump, you may encounter an error that says, “native client is not specified for connection.” This error typically occurs when DBeaver can’t find the mysqldump executable on your system. Fortunately, there is a simple solution to this problem.

To resolve this issue, you need to specify the location of the mysqldump executable in DBeaver. Here are the steps you can follow:

  1. Click on the “Local Client …” button in the Export dialog of DBeaver. This will open a new pop-up window where you can specify the location of the mysqldump executable.
  2. From the drop-down menu in the pop-up window, select the “Browse …” option. This will allow you to navigate to the installation folder where mysqldump is located on your system.
  3. Once you’ve located the mysqldump executable, click OK on both windows. This will save your settings and allow you to perform a database dump using DBeaver.

To find the location of the mysqldump executable on your system, you can use the following command in a terminal window:

which mysqldump;

This command will display the full path to the mysqldump executable. Once you have this information, you can follow the steps above to specify the location of mysqldump in DBeaver.

In summary, if you’re getting the “native client is not specified for connection” error when trying to perform a database dump in DBeaver, you can resolve it by specifying the location of the mysqldump executable using the steps outlined above. The “which mysqldump” command can be used to find the location of mysqldump on your system.

MySQL copy the contents of one table into another

 in Applications  tagged distinct / INSERT / INSERT INTO / mysql / SELECT DISTINCT by

MySQL is a popular open-source relational database management system that allows users to store and retrieve data from a database. The INSERT INTO command is used to insert data into a MySQL database, while the SELECT statement is used to retrieve data from a database. In this blog post, we will explore the MySQL command INSERT INTO tableA SELECT DISTINCT * FROM tableB“.

Explanation:

The “INSERT INTO tableA SELECT DISTINCT * FROM tableB;” command is used to insert unique rows from tableB into tableA. Let’s break down this command to understand its components:

  1. INSERT INTO tableA: This component specifies the table that we want to insert data into. In this case, we are inserting data into tableA.
  2. SELECT DISTINCT : This component selects all the columns () from tableB and removes any duplicates using the DISTINCT keyword.
  3. FROM tableB: This component specifies the table from which we want to select data. In this case, we are selecting data from tableB.

Putting it all together, the command INSERT INTO tableA SELECT DISTINCT * FROM tableB; selects all the unique rows from tableB and inserts them into tableA.

Let’s look at an example to understand this command better. Suppose we have two tables, tableA and tableB, with the following data:

tableA:

idnameage
1John20
2Peter25

tableB:

idnameage
1John20
2Peter25
3Sarah30
4Rachel35

If we run the command INSERT INTO tableA SELECT DISTINCT * FROM tableB;, it will insert the unique rows from tableB into tableA. Since tableA already contains the rows for John and Peter, only the rows for Sarah and Rachel will be inserted into tableA. Therefore, the resulting tableA will look like:

tableA:

idnameage
1John20
2Peter25
3Sarah30
4Rachel35

Conclusion:

The MySQL command “INSERT INTO tableA SELECT DISTINCT * FROM tableB;” is a powerful tool for inserting unique rows from one table into another. It can be helpful when you have two tables with overlapping data and want to consolidate the data into a single table. Understanding how this command works allows you to manage your MySQL databases and optimize your data storage effectively.

How to empty the gnome tracker3 cache?

 in Bash / GNU/Linux  tagged bash / clear cache / daemon / free space / gnome / GNU/Linux / tracker3 / ubuntu by

To empty the cache of gnome tracker3, you can follow the steps below:

Open a terminal window by pressing Ctrl + Alt + T.

Type the following command to stop the tracker daemon:

tracker3 daemon -t;

Type the following command to clear the tracker database:

tracker reset --filesystem;

This command will remove all indexed data from the tracker and clear its cache. (Remove filesystem indexer database)

Restart the tracker daemon by typing the following command:

tracker daemon -s ;

This will start the tracker daemon again, and it will begin to rebuild its database and cache.

After following these steps, the cache of gnome tracker3 will be emptied.

Execution example:

$ tracker3 daemon -t
Found 1 PID…
  Killed process 13705 — “tracker-miner-fs-3”
$ tracker3 reset --filesystem
Found 1 PID…
  Killed process 13705 — “tracker-miner-fs-3”
$ tracker3 daemon -s
Starting miners…
  ✓ File System