· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 324 7.2.1 Use the state interface· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 324 Hibernate Region feature by default. If a Region is in an inactive state for a long time, it is automatically set to a silent state, which reduces the system overhead of the heartbeat information between INDEX person_unique_id; Note: DDL operations are not transactions. You don’t need to run a COMMIT state- ment when executing DDL operations. 85 3.2.5 Insert, update, and delete data Common DML features

interval �→ Modified Controls the running frequency at which repli- caChecker checks the health state of a Region. The smaller this value is, the faster repli- caChecker runs. Normally, you do not need INDEX person_unique_id; Note: DDL operations are not transactions. You don’t need to run a COMMIT state- ment when executing DDL operations. 3.3.5 Insert, update, and delete data Common DML features are the firewall status. Take CentOS Linux release 7.7.1908 (Core) as an example. sudo firewall-cmd --state sudo systemctl status firewalld.service 2. Stop the firewall service. sudo systemctl stop firewalld

corresponding to a SQL digest. – Add the TIDB_DECODE_SQL_DIGESTS function to query the normalized SQL state- ments (a form without formats and arguments) corresponding to a set of SQL digests in the cluster distinguishing query-executing transactions from idle transactions on the TIDB_TRX system table. The Normal state is now divided into Running and Idle states. User documents: 37 - View the pessimistic lock-waiting in correlated subqueries is wrong #25799 • TiKV – Fix the wrong tikv_raftstore_hibernated_peer_state metric #10330 – Fix the wrong arguments type of the json_unquote() function in the coprocessor #10176

only uses statistics of some columns (such as columns in the WHERE, JOIN, ORDER BY, and GROUP BY state- ments). These used columns are called PREDICATE COLUMNS. Since v5.4.0, you can set the value of INDEX person_unique_id; Note: DDL operations are not transactions. You don’t need to run a COMMIT state- ment when executing DDL operations. 3.3.5 Insert, update, and delete data Common DML features are the firewall status. Take CentOS Linux release 7.7.1908 (Core) as an example. sudo firewall-cmd --state sudo systemctl status firewalld.service 2. Stop the firewall service. sudo systemctl stop firewalld

whether to re- turn er- ror im- me- di- ately when an er- ror oc- curs in a non- transactional DML state- ment. 54 Variable name Change type Description tidb_prepared_plan_cache_memory_guard_ratio �→ tions across in- stances) fea- ture. When the value is true �→ , both KILL �→ and KILL �→ �→ TIDB �→ state- ments can ter- mi- nate queries or con- nec- tions across in- stances so you do not need to worry INDEX person_unique_id; Note: DDL operations are not transactions. You don’t need to run a COMMIT state- ment when executing DDL operations. 3.3.5 Insert, update, and delete data Common DML features are

�→ Modified Takes effect start- ing from v6.5.0. It con- trols whether read opera- tions in SQL state- ments con- taining INSERT �→ , DELETE �→ , and UPDATE can be pushed down to Ti- Flash. The default mem- ory quota for a query. For TiDB v6.5.0 and later ver- sions, to control the mem- ory of DML state- ments more accu- rately, this vari- able is used to set the thresh- old value of mem- ory quota for used to set the concur- rency of scan opera- tions per- formed when TiDB exe- cutes inter- nal SQL state- ments (such as an auto- matic update of statis- tics). The default value is 1. 62 Variable name

transactions in the same way as other DML statements, especially in the same way as MySQL. The LOAD DATA state- ment in a transaction no longer automatically commits the current transaction or starts a new transaction which automatically terminates long-running idle transactions. When a user session in a transactional state remains idle for a duration exceeding the value of this variable, TiDB will terminate the database The default value is 1. When TiDB DDL V2 is en- abled, DDL state- ments will be exe- cuted using TiDB DDL V2. The ex- ecution speed of DDL state- ments for cre- ating tables is in- creased by 10 times com-

mental data. TiCDC sql- �→ mode Newly added Specifies the SQL mode used by TiCDC when parsing DDL state- ments. The default value is the same as the default SQL mode of TiDB. 55 Configuration file Configuration Tools • Backup & Restore (BR) • Fix the issue that PITR might skip restoring the CREATE INDEX DDL state- ment #47482 @Leavrth • Fix the issue that the log backup might get stuck in some scenarios when port us- ing TiDB Light- ning Y Y Y Y Y Y Y Y Y Y Fast im- port us- ing the IMPORT �→ �→ INTO �→ state- ment Y N N N N N N N N N mydumper log- ical dumper Deprecated Deprecated Deprecated Deprecated

_for_dml �→ Newly added Controls whether to enable the Non- prepared plan cache feature for DML state- ments. tidb_enable_row_level_checksum �→ Newly added Controls whether to enable the TiCDC data INDEX person_unique_id; Note: DDL operations are not transactions. You don’t need to run a COMMIT state- ment when executing DDL operations. 125 3.3.5 Insert, update, and delete data Common DML features to �→ the resources in your template # Allow SAM CLI IAM role creation [Y/n]: # #Preserves the state of previously provisioned resources when �→ an operation fails # Disable rollback [y/N]: # tidbHelloWorldFunction

_ �→ column �→ _ �→ options �→ Newly added Controls the be- havior of the ANALYZE �→ �→ TABLE �→ state- ment. Setting it to the default value PREDICATE �→ means only collect- ing statis- tics for predi- table #53567 @hi- rustin • Support applying the tidb_redact_log setting to the output of EXPLAIN state- ments and further optimize the logic in processing logs #54565 @hawkingrei • Support generating port us- ing TiDB Light- ning Y Y Y Y Y Y Y Y Y Y Y Fast im- port us- ing the IMPORT �→ �→ INTO �→ state- ment Y Y Y Y N N N N N N N mydumper log- i- cal dumper Deprecated Deprecated Deprecated Deprecated