new error in Calibre

[gianni_fed]

Hello,
for some time I have received the same error twice, does anyone know what it is due to? can you correct?
The error in Figure 1 appeared when I tried to change the name of the book, the number 2 when I tried to delete it, but I think it's still the same.
Thanks,
Gianni

[kovidgoyal]

this will happen if you put your calibre library in some unsuitable location, such as a network drive, or a folder that is synced via a file sync tool such as dropbox. Or alternatively your antivirus could be interfering, in which case try excluding the calibre library folder from it.

[gianni_fed]

Thanks.
Please, I would like to ask you if it's possible, when I select multiple books, to have the opportunity to remove all font families from all books at once.
Thank you very much,
bye,
Gianni

[theducks]

Originally Posted by gianni_fed

Thanks.
Please, I would like to ask you if it's possible, when I select multiple books, to have the opportunity to remove all font families from all books at once.
Thank you very much,
bye,
Gianni

Modify EPUB Plugin will do that. That choice is on the right side

Note: this may destroy your books with non-standard font usage if your book has custom or special characters (eg runes)

[Colsteven]

I receive this error every time my library reaches approximately 50,500 books. I have excluded the library from my anti virus. The number of books seems to be an issue. Is there a way to expand the size of the library?

[theducks]

Originally Posted by Colsteven

I receive this error every time my library reaches approximately 50,500 books. I have excluded the library from my anti virus. The number of books seems to be an issue. Is there a way to expand the size of the library?

Have you run Library Maintenance? That cleans metadata.db of dead records (records are normally just marked as unused on most DB systems).

If your DB has grown, it may exceed the file system (formatted type) allowed size.
What is the size of metadata.db?
What format type is used on your disk?
What OS and is it 64 bit?

Many folk have lots mor books.

What eats DB space, is big comments (I have see a sample chapter there ), many custom columns.

[Colsteven]

Originally Posted by theducks

Have you run Library Maintenance? That cleans metadata.db of dead records (records are normally just marked as unused on most DB systems).

If your DB has grown, it may exceed the file system (formatted type) allowed size.
What is the size of metadata.db?
What format type is used on your disk?
What OS and is it 64 bit?

Many folk have lots mor books.

What eats DB space, is big comments (I have see a sample chapter there ), many custom columns.

Thank you for your response. I'll try out Library Maintenance. I have never used it. I am using Windows 10 64 bit. I don't have any comments or custom columns.