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# switching from mysql.global_priv to mysql.user
set global sql_mode="";
set local sql_mode="";
alter table mysql.user modify User char(16) binary not null default '';
alter table mysql.db modify User char(16) binary not null default '';
alter table mysql.tables_priv modify User char(16) binary not null default '';
alter table mysql.columns_priv modify User char(16) binary not null default '';
alter table mysql.procs_priv modify User char(16) binary not null default '';
alter table mysql.proc modify definer char(77) collate utf8_bin not null default '';
alter table mysql.event modify definer char(77) collate utf8_bin not null default '';
flush privileges;
select user();
Catalog Database Table Table_alias Column Column_alias Type Length Max length Is_null Flags Decimals Charsetnr
def user() 253 77 14 N 1 39 8
user()
root@localhost
create user a17aaaaaaaaaaaaa0@localhost;
ERROR HY000: String 'a17aaaaaaaaaaaaa0' is too long for user name (should be no longer than 16)
grant usage on *.* to a17aaaaaaaaaaaaa0@lodalhost;
ERROR HY000: String 'a17aaaaaaaaaaaaa0' is too long for user name (should be no longer than 16)
drop user a17aaaaaaaaaaaaa0@lodalhost;
ERROR HY000: String 'a17aaaaaaaaaaaaa0' is too long for user name (should be no longer than 16)
alter table mysql.user modify User char(80) binary not null default '';
alter table mysql.db modify User char(80) binary not null default '';
alter table mysql.tables_priv modify User char(80) binary not null default '';
alter table mysql.columns_priv modify User char(80) binary not null default '';
alter table mysql.procs_priv modify User char(80) binary not null default '';
alter table mysql.proc modify definer char(141) collate utf8_bin not null default '';
alter table mysql.event modify definer char(141) collate utf8_bin not null default '';
flush privileges;
select user();
Catalog Database Table Table_alias Column Column_alias Type Length Max length Is_null Flags Decimals Charsetnr
def user() 253 141 14 N 1 39 8
user()
root@localhost
set global sql_mode=default;
# switching back from mysql.user to mysql.global_priv
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