of existence repeatedly, over the course of multiple seconds. In this 30-second test with ~12 up- dates per second, TiDB lost 64 out of 378 insertions. TiDB’s automatic transaction retry mechanism was documented debatable. Even with these conservative as- sumptions, TiDB’s default settings allow P4 (lost up- dates), and G-single (read skew), both of which are il- legal under snapshot isolation. With tidb_retry_limit

occurs in the pessimistic transaction, TiDB retries the SQL statement currently being executed and up- dates this timestamp. You can configure the number of retries via max-retry- �→ count. In the optimistic Ssl_server_not_after and Ssl_server_not_before �→ status variables to monitor the start and end dates of the validity of the certificate. SHOW GLOBAL STATUS LIKE 'Ssl\_server\_not\_%'; +----------- MySQL’s behavior, but it might not match in all instances. It is recommended to correctly format dates, because the intended behavior for incorrectly formatted values is not documented, and is often inconsistent

occurs in the pessimistic transaction, TiDB retries the SQL statement currently being executed and up- dates this timestamp. You can configure the number of retries via max-retry- �→ count. In the optimistic Ssl_server_not_after and Ssl_server_not_before �→ status variables to monitor the start and end dates of the validity of the certificate. 1565 SHOW GLOBAL STATUS LIKE 'Ssl\_server\_not\_%'; +----- MySQL’s behavior, but it might not match in all instances. It is recommended to correctly format dates, because the intended behavior for incorrectly formatted values is not documented, and is often inconsistent

tidb_mem_quota_analyze �→ Newly added This vari- able con- trols the max- i- mum mem- ory us- age when TiDB up- dates statis- tics, in- clud- ing man- u- ally exe- cuted ANALYZE �→ �→ TABLE �→ by users and au- to- matic book’s ids, titles, types (for example, magazine, novel, life, arts), stock, prices, and publication dates. CREATE TABLE `bookshop`.`books` ( `id` bigint NOT NULL, `title` varchar(100), `type` enum('Magazine' occurs in the pessimistic transaction, TiDB retries the SQL statement currently being executed and up- dates this timestamp. You can configure the number of retries via max-retry- �→ count. In the optimistic

occurs in the pessimistic transaction, TiDB retries the SQL statement currently being executed and up- dates this timestamp. You can configure the number of retries via max-retry- �→ count. In the optimistic MySQL’s behavior, but it might not match in all instances. It is recommended to correctly format dates, because the intended behavior for incorrectly formatted values is not documented, and is often inconsistent date as specified DATE_SUB() Subtract a time value (interval) from a date DATEDIFF() Subtract two dates DAY() Synonym for DAYOFMONTH() 1929 Name Description DAYNAME() Return the name of the weekday

occurs in the pessimistic transaction, TiDB retries the SQL statement currently being executed and up- dates this timestamp. You can configure the number of retries via max-retry- �→ count. In the optimistic Ssl_server_not_after and Ssl_server_not_before �→ status variables to monitor the start and end dates of the validity of the certificate. SHOW GLOBAL STATUS LIKE 'Ssl\_server\_not\_%'; +----------- MySQL’s behavior, but it might not match in all instances. It is recommended to correctly format dates, because the intended behavior for incorrectly formatted values is not documented, and is often inconsistent

Before v8.0.0, when you create a table, the default value of a column is limited to strings, numbers, dates, and certain expressions. Starting from v8.0.0, you can use more expressions as the default column book’s ids, titles, types (for example, magazine, novel, life, arts), stock, prices, and publication dates. CREATE TABLE `bookshop`.`books` ( `id` bigint NOT NULL, `title` varchar(100), 338 `type` enum('Magazine' Ssl_server_not_after and Ssl_server_not_ �→ before status variables to monitor the start and end dates of the validity of the cer- tificate. SHOW GLOBAL STATUS LIKE 'Ssl\_server\_not\_%'; +---------

book’s ids, titles, types (for example, magazine, novel, life, arts), stock, prices, and publication dates. CREATE TABLE `bookshop`.`books` ( `id` bigint NOT NULL, `title` varchar(100), `type` enum('Magazine' occurs in the pessimistic transaction, TiDB retries the SQL statement currently being executed and up- dates this timestamp. You can configure the number of retries via max-retry- �→ count. In the optimistic Ssl_server_not_after and Ssl_server_not_before �→ status variables to monitor the start and end dates of the validity of the certificate. SHOW GLOBAL STATUS LIKE 'Ssl\_server\_not\_%'; +-----------

Before v8.0.0, when you create a table, the default value of a column is limited to strings, numbers, dates, and certain expressions. Starting from v8.0.0, you can use more expressions as the default column book’s ids, titles, types (for example, magazine, novel, life, arts), stock, prices, and publication dates. CREATE TABLE `bookshop`.`books` ( `id` bigint NOT NULL, `title` varchar(100), `type` enum('Magazine' occurs in the pessimistic transaction, TiDB retries the SQL statement currently being executed and up- dates this timestamp. You can configure the number of retries via max-retry- �→ count. In the optimistic

priorities for ob- jects in combination with a variety of conditions to ensure that more deserving candi- dates are processed in priority, such as newly created indexes and partitioned tables with definition changes v8.0.0, when you create a table, the default value of a column is limited to strings, numbers, and dates. Starting from v8.0.0, you can use some expressions as the default column values. For example, you book’s ids, titles, types (for example, magazine, novel, life, arts), stock, prices, and publication dates. CREATE TABLE `bookshop`.`books` ( `id` bigint NOT NULL, `title` varchar(100), `type` enum('Magazine'