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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() 253 272 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(128) binary not null default ''; alter table mysql.db modify User char(128) binary not null default ''; alter table mysql.tables_priv modify User char(128) binary not null default ''; alter table mysql.columns_priv modify User char(128) binary not null default ''; alter table mysql.procs_priv modify User char(128) binary not null default ''; alter table mysql.proc modify definer varchar(384) collate utf8_bin not null default ''; alter table mysql.event modify definer varchar(384) 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() 253 384 14 N 1 39 8 user() root@localhost set global sql_mode=default; # switching back from mysql.user to mysql.global_priv