You can use the BLOB data type to save the content of an image, document, etc. In the painting. PostgreSQL doesn’t support BLOBs, but you can use the BYTEA data type to store binary data.
In general, databases are best for data and file systems are best for files. It depends on what you want to do with the image. If you are saving images for a website, it is best to save them as a file on the server. Also, it will bind the database a little while sending the image.
Binary data types. The Bytea data type allows storage of binary strings, see Table 86. Strings do not allow zero checks or other invalid byte values and strings of invalid byte values, depending on the encoding of the number of characters selected by the database.
PostgreSQL offers two different ways to store binary data. Binary data can be stored in a table with the data type Bytea or with the Large Object function, which stores the binary data in a separate table in a special format and references the table with a value of type oid for storage in the table.
It is not recommended to store images in a database table. There are too many drawbacks to this approach. To store image data in the table, the database server must process and distribute huge amounts of data that can best be used for the processing for which it is best suited.
Save images to MongoDB using GridFS. Summary: MongoDB GridFS is a good specification for large file storage in MongoDB. This divides the file into sections and stores it in a database. This article explains the mechanism for saving and restoring binary files to and from MongoDB.
Hard drives are great for storing photos because they are cheap, have fast data access, and it’s very easy to copy an entire hard drive to another hard drive, especially if you have USB 3.0 or Thunderbolt connections. . Backup hard drives have their limitations, however.
In general, databases are slower than files. When you need to index your files, a hard-coded path in custom index structures always has the potential to be faster if you do it right. However, performance is not the goal when choosing a database over a file-based solution.
Yes, you can save the images in the database, but the images can be much larger than 1 and 2 MB and if you load the database unnecessarily and the performance slows down, save the images in the project manager or file system and save the image in the path to the database.
Reasons for storing files in the database:
All files are saved in /var/lib/postgresql/9.5/main/base/16387/. The first GB of the table is stored in a file called 51330, the second in a file called 51330.1, the third in 51330.2, and so on.
In a database, data is stored in tables.
PostgreSQL stores all the data you enter into your databases in this folder (see PostgreSQL database file format). Each subdirectory is used by a database in your cluster, the files contained in it are the actual data of the relationships (tables, indexes, rows).
they look like lines, a tuple is basically what it is. it shouldn’t impress, but what the heck. IS. A tuple is defined as a data object that contains two or more.
TOAST is a mechanism used by PostgreSQL to prevent physical rows of data from exceeding the size of a block of data (typically 8 KB). If it is not enough to get the row below 2 KB, it divides the wide field values into bits, which are stored in the corresponding TOAST table.
To view all databases defined on the server, you can use the list meta command or the l link.
PostgreSQL configuration files are stored in the root directory / etc / postgresql //. For example, when you install PostgreSQL 9.5, the configuration files are stored in the /etc/postgresql/9.5/main directory.
Click the Open File icon to view a previously saved query in the SQL Editor. Click the Save icon to save the query currently displayed in the SQL editor. Click the Copy icon to copy the selected row. Click the Paste icon to paste the contents of the clipboard.