MySQL Source-Configuration Options A descriptive comment about the compilation environment for use by  mysqld  (for example, to set the version_comment  system variable). This option was added in MySQL 8.0.14. Prior to 8.0.14, the server uses  COMPILATION_COMMENT . The server character set. By default, MySQL uses the  utf8mb4  character set. charset_name  may be one of  binary ,  armscii8 ,  ascii ,  big5 ,  cp1250 ,  cp1251 ,  cp1256 , cp1257 ,  cp850 ,  cp852 ,  cp866 ,  cp932 ,  dec8 ,  eucjpms ,  euckr ,  gb2312 ,  gbk ,  geostd8 , greek ,  hebrew ,  hp8 ,  keybcs2 ,  koi8r ,  koi8u ,  latin1 ,  latin2 ,  latin5 ,  latin7 ,  macce , macroman ,  sjis ,  swe7 ,  tis620 ,  ucs2 ,  ujis ,  utf8 ,  utf8mb4 ,  utf16 ,  utf16le ,  utf32 . The permissible character sets are listed in the  cmake/character_sets.cmake  file as the value of CHARSETS_AVAILABLE . This value can be set at server startup with the  --character_set_server  option. The server collation. By default, MySQL uses  utf8mb4_0900_ai_ci . Use the  SHOW COLLATION statement to determine which collations are available for each character set. This value can be set at server startup with the  --collation_server  option. Whether to exclude the Performance Schema condition instrumentation. The default is  OFF  (include). Whether to exclude the Performance Schema file instrumentation. The default is  OFF  (include). Whether to exclude the Performance Schema idle instrumentation. The default is  OFF  (include). Whether to exclude the Performance Schema memory instrumentation. The default is  OFF  (include). Whether to exclude the Performance Schema metadata instrumentation. The default is  OFF  (include). Whether to exclude the Performance Schema mutex instrumentation. The default is  OFF  (include). Whether to exclude the Performance Schema rwlock instrumentation. The default is  OFF  (include). Whether to exclude the Performance Schema socket instrumentation. The default is  OFF  (include). 230 • -DCOMPILATION_COMMENT_SERVER= string • -DDEFAULT_CHARSET= charset_name • -DDEFAULT_COLLATION= collation_name • -DDISABLE_PSI_COND= bool • -DDISABLE_PSI_FILE= bool • -DDISABLE_PSI_IDLE= bool • -DDISABLE_PSI_MEMORY= bool • -DDISABLE_PSI_METADATA= bool • -DDISABLE_PSI_MUTEX= bool • -DDISABLE_PSI_RWLOCK= bool • -DDISABLE_PSI_SOCKET= bool • -DDISABLE_PSI_SP= bool