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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: Can't create table '#################################################_long___' (errno: ##) 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: Can't create table '#################################################_long___' (errno: ##) # # 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_.frm #################################################_long_.ibd ---- list_files MYSQLD_DATADIR/this_sixty_four_byte_name_is_not_too_long_______________________ db.opt this_sixty_four_byte_name_is_not_too_long_______________________.frm this_sixty_four_byte_name_is_not_too_long_______________________.ibd ---- list_files MYSQLD_DATADIR/##################################################_long #################################################_long.frm #################################################_long.ibd db.opt SELECT name FROM information_schema.innodb_sys_tables WHERE name LIKE '%long%'; name ##################################################_long/#################################################_long test/#################################################_long_ this_sixty_four_byte_name_is_not_too_long_______________________/this_sixty_four_byte_name_is_not_too_long_______________________ twenty_byte_db_name_/#################################################_long_ SELECT name FROM information_schema.innodb_sys_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_sys_datafiles WHERE path LIKE '%long%'; path ./this_sixty_four_byte_name_is_not_too_long_______________________/this_sixty_four_byte_name_is_not_too_long_______________________.ibd ./test/#################################################_long_.ibd ./twenty_byte_db_name_/#################################################_long_.ibd ./##################################################_long/#################################################_long.ibd SELECT file_name, tablespace_name FROM information_schema.files WHERE file_name LIKE '%long%'; file_name ./this_sixty_four_byte_name_is_not_too_long_______________________/this_sixty_four_byte_name_is_not_too_long_______________________.ibd tablespace_name innodb_file_per_table_## file_name ./test/#################################################_long_.ibd tablespace_name innodb_file_per_table_## file_name ./twenty_byte_db_name_/#################################################_long_.ibd tablespace_name innodb_file_per_table_## file_name ./##################################################_long/#################################################_long.ibd tablespace_name innodb_file_per_table_## # # 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_`;