You merged from localhost?
use "bigdump" tool for large DB
reset your memory_limit to default
Used BigDump now, import succesfull but got this error
MyBB has experienced an internal SQL error and cannot continue.
SQL Error:
1146 - Table 'admin_tntcrush.mybb_sessions' doesn't exist
Query:
SELECT * FROM mybb_sessions WHERE sid='9525329196cdc19cd8b36d368699e5bb' AND ip=X'c3e61883'
make sure the table admin_tntcrush.. exist in phpmyadmin, always test on localhost before uploading to host