Hello. After export and import the database of my site ІPS, first I get an error 503 (during imports), and then - working function incorrectly ІPS (frequent error window), also does not work diagnostic tool (in terms of support). What am i doing wrong? Thank you!

php.ini

realpath_cache_size = 16k
realpath_cache_ttl = 120

memory_limit = 256M

post_max_size = 128M;
upload_max_filesize = 128M;

Database size - 18MB

Export and Import using SSH. Its much better.

Export: mysqldump -u User -pPass Database > Database.sql

Import: mysql -u User -pPass Database < Database.sql