sys schema, 5177 user_summary_by_stages view sys schema, 5177 user_summary_by_statement_latency view sys schema, 5178 user_summary_by_statement_type view sys schema, 5178 user_variables_by_thread table performance_schema, 4996 UseShm, 4102 use_invisible_indexes flag optimizer_switch system variable, 1728 USE_LD_GOLD option CMake, 234 USE_LD_LLD option CMake, 234 use_secondary_engine system variable, 914 USING HASH with NDB tables, 2525 using multiple disks to start data, 1834 using NDB Cluster programs, 4237 USING versus ON joins, 2675 UTC_DATE(), 2168 UTC_TIME(), 2168 UTC_TIMESTAMP(), 2169 UTF-8, 1926 database object metadata, 1931 utf16 character set, 1965 as client character set, 1944 utf16le character set, 1966 as client character set, 1944 utf16_bin collation, 1976 utf32 character set, 1966 as client character set, 1944 utf8 character set, 1965 alias for utf8mb3, 1964, 1965 utf8mb3 deprecated features, 40 utf8mb3 character set, 1964 utf8 alias, 1964, 1965 utf8mb4 character set, 1963 utf8mb4 collations, 1972 utf8mb4_0900_bin versus utf8mb4_bin, 1970 utf8mb4_bin versus utf8mb4_0900_bin, 1970 utilities program-development, 341 utility programs, 340 UUID(), 2451 UUID_SHORT(), 2451 UUID_TO_BIN(), 2452 5607