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#
# Test the limits of a file-per-table tablespace name. MySQL combines
# the database name with the table name to make a unique table name.
#
SET default_storage_engine=InnoDB;
#
# MySQL limits each database and tablename identifier to 64 characters
# of up to 3 bytes per character, corresponding to 192 bytes.
#
CREATE DATABASE `this_sixty_five_byte_name_is_too_long____________________________`;
ERROR 42000: Identifier name 'this_sixty_five_byte_name_is_too_long____________________________' is too long
CREATE DATABASE `this_sixty_four_byte_name_is_not_too_long_______________________`;
USE `this_sixty_four_byte_name_is_not_too_long_______________________`;
#
# A 64 character tablename can be created in a 64 character database name
#
CREATE TABLE `this_sixty_four_byte_name_is_not_too_long_______________________`.`this_sixty_four_byte_name_is_not_too_long_______________________` (a SERIAL);
#
# A 65 character tablename is too long.
#
CREATE TABLE `test`.`this_sixty_five_byte_name_is_too_long____________________________` (a SERIAL);
ERROR 42000: Identifier name 'this_sixty_five_byte_name_is_too_long____________________________' is too long
CREATE TABLE `this_sixty_four_byte_name_is_not_too_long_______________________`.`this_sixty_five_byte_name_is_too_long____________________________` (a SERIAL);
ERROR 42000: Identifier name 'this_sixty_five_byte_name_is_too_long____________________________' is too long
#
# Non-non-filename-safe characters like '#' are expanded to '@0023'.
# On many file systems, such as Linux extfs, you can create a database name
# that expands to up to 255 bytes long.
# `##################################################_long` is expanded to
# (50 * 5) + 5 = 255.
#
CREATE DATABASE `##################################################_long`;;
USE `##################################################_long`;
#
# This 256-byte name is only one byte longer but fails with an error code
# from the stat operation.
# `##################################################_long_` is expanded to
# (50 * 5) + 6 = 256.
#
CREATE DATABASE `##################################################_long_`;
ERROR HY000: Can't get stat of './##################################################_long_' (Errcode: ## - File name too long)
#
# This 300-byte name which is the longest name that gets an error code
# from the stat operation.
# `###########################################################_long` is expanded to
# (59 * 5) + 5 = 300.
#
CREATE DATABASE `###########################################################_long`;
ERROR HY000: Can't get stat of './###########################################################_long' (Errcode: ## - File name too long)
#
# This 301-byte name which is only one byte longer but fails with ER_TOO_LONG_IDENT.
# `###########################################################_long_` is expanded to
# (59 * 5) + 6 = 301.
#
CREATE DATABASE `###########################################################_long_`;
ERROR 42000: Identifier name '###########################################################_long_' is too long
USE test;
#
# An expanded table name is limited to 251 bytes
#
CREATE TABLE `test`.`#################################################_long_` (a SERIAL);
#
# A 252-byte tablename is too long
#
CREATE TABLE `test`.`#################################################_long___` (a SERIAL);
ERROR HY000: Got error 168 - 'Unknown (generic) error from engine' from storage engine
CREATE DATABASE twenty_byte_db_name_;
USE `twenty_byte_db_name_`;
#
# A 251 byte expanded table name will fit with a longer database name
#
CREATE TABLE `twenty_byte_db_name_`.`#################################################_long_` (a SERIAL);
#
# A 252 byte expanded table name is also too long in a longer database name
#
CREATE TABLE `twenty_byte_db_name_`.`#################################################_long___` (a SERIAL);
ERROR HY000: Got error 168 - 'Unknown (generic) error from engine' from storage engine
#
# Another limitation is a 512 byte length to an expanded path that includes
# the datadir which is './' in this test, the expanded database name,
# the directory separator '/', the expanded table name, and the file extension.
# './long_db_name.long_250_byte_table_name.frm'
# 2+ 255 +1+ 250 +1+3 = 512
#
CREATE TABLE `##################################################_long`.`#################################################_long` (a SERIAL);
CREATE TABLE `##################################################_long`.`#################################################_long_` (a SERIAL);
ERROR HY000: Long database name and identifier for object resulted in path length exceeding 512 characters. Path: './@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023_long/@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@
SHOW WARNINGS;
Level Code Message
Error 1860 Long database name and identifier for object resulted in path length exceeding 512 characters. Path: './@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023_long/@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@0023@
#
# Show the successfully created databases and tables
#
---- list_files MYSQLD_DATADIR/test
#################################################_long_.ibd
---- list_files MYSQLD_DATADIR/this_sixty_four_byte_name_is_not_too_long_______________________
this_sixty_four_byte_name_is_not_too_long_______________________.ibd
---- list_files MYSQLD_DATADIR/##################################################_long
#################################################_long.ibd
SELECT name FROM information_schema.innodb_tables WHERE name LIKE '%long%';
name
this_sixty_four_byte_name_is_not_too_long_______________________/this_sixty_four_byte_name_is_not_too_long_______________________
test/#################################################_long_
twenty_byte_db_name_/#################################################_long_
##################################################_long/#################################################_long
SELECT name FROM information_schema.innodb_tablespaces WHERE name LIKE '%long%';
name
this_sixty_four_byte_name_is_not_too_long_______________________/this_sixty_four_byte_name_is_not_too_long_______________________
test/#################################################_long_
twenty_byte_db_name_/#################################################_long_
##################################################_long/#################################################_long
SELECT path FROM information_schema.innodb_datafiles WHERE path LIKE '%long%' order by path;
PATH
./##################################################_long/#################################################_long.ibd
./test/#################################################_long_.ibd
./this_sixty_four_byte_name_is_not_too_long_______________________/this_sixty_four_byte_name_is_not_too_long_______________________.ibd
./twenty_byte_db_name_/#################################################_long_.ibd
SELECT file_name, tablespace_name FROM information_schema.files
WHERE file_name LIKE '%long%' ORDER BY file_name;
FILE_NAME ./##################################################_long/#################################################_long.ibd
TABLESPACE_NAME ##################################################_long/#################################################_long
FILE_NAME ./test/#################################################_long_.ibd
TABLESPACE_NAME test/#################################################_long_
FILE_NAME ./this_sixty_four_byte_name_is_not_too_long_______________________/this_sixty_four_byte_name_is_not_too_long_______________________.ibd
TABLESPACE_NAME this_sixty_four_byte_name_is_not_too_long_______________________/this_sixty_four_byte_name_is_not_too_long_______________________
FILE_NAME ./twenty_byte_db_name_/#################################################_long_.ibd
TABLESPACE_NAME twenty_byte_db_name_/#################################################_long_
#
# Cleanup
#
DROP TABLE `this_sixty_four_byte_name_is_not_too_long_______________________`.`this_sixty_four_byte_name_is_not_too_long_______________________`;
DROP TABLE `test`.`#################################################_long_`;
DROP TABLE `twenty_byte_db_name_`.`#################################################_long_`;
DROP TABLE `##################################################_long`.`#################################################_long`;
DROP DATABASE `this_sixty_four_byte_name_is_not_too_long_______________________`;
DROP DATABASE `##################################################_long`;
DROP DATABASE `twenty_byte_db_name_`;
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