update the TiUP cluster component to the latest version: tiup update --self && tiup update cluster Expected output includes “Update successfully!”. 5. Verify the current version of your TiUP cluster: tiup following command to check the status of the tidb-test cluster: tiup cluster display tidb-test Expected output includes the instance ID, role, host, listening port, and status (because the cluster is command to check the cluster status. For example: tiup cluster display tidb-test Expected output: If the Status information of each node is Up, the cluster runs normally. 4.5.1.2 Use TiDB

temporary tables to the downstream, a table definition error occurs. – The following clusters are expected to be v5.3.0 or later; otherwise, data error is reported when you create a global temporary table: issue that the SHOW VIEW permission is not required to execute SHOW CREATE �→ VIEW. Now you are expected to have the SHOW VIEW permission to execute the SHOW CREATE VIEW statement. • The system variable fewest �→ connections receives the connection. "leastconn" is recommended �→ where long sessions are expected, such as LDAP, SQL and TSE, rather �→ than protocols using short sessions, such as HTTP. The algorithm

Database, but may be used with support of the storage vendor as long as they do not interfere with the expected operation of Greenplum Database at the discretion of VMware. Greenplum Database can be deployed variable generation issue caused when symlinks were pointing to alternative locations than the ones expected. 12419 : Resolves an issue where Greenplum Database, during node recovery, generated an error in an empty set. 30946 - Query Optimizer : A query on a table with a btree index ran longer than expected because the Query Optimizer did not perform partition elimination when the query included an index

Database, but may be used with support of the storage vendor as long as they do not interfere with the expected operation of Greenplum Database at the discretion of VMware. Greenplum Database can be deployed variable generation issue caused when symlinks were pointing to alternative locations than the ones expected. 12419 : Resolves an issue where Greenplum Database, during node recovery, generated an error in an empty set. 30946 - Query Optimizer : A query on a table with a btree index ran longer than expected because the Query Optimizer did not perform partition elimination when the query included an index

ParallelApply is used under the TopN operator #24930 41 – Fix the issue that more results than expected are returned when executing SQL statements using multi-column prefix indexes #24356 – Fix the issue #10347 – Fix the wrong function that casts DOUBLE to DOUBLE #25200 • PD – Fix the issue that the expected scheduling cannot be generated due to scheduling conflicts among multiple schedulers #3807 #3778 TiFlash cluster can have near-linear scalability. The number of TiFlash nodes should be tuned based on expected performance and response time. * If the OLTP throughput is relatively high (for example, the write

Engine void MaterializeMetadata::transaction(const MySQLReplication::Position & position, const std::function & fun) { String persistent_tmp_path = persistent_path + ".tmp"; { out); out.next(); out.sync(); out.close(); } commitMetadata(std::move(fun), persistent_tmp_path, persistent_path); } Select history data MaterializeMySQL Database iterator->second, query_context, database_name, comment); /// create table. auto out = std::make_shared(getTableOutput(database_name, table_name, query_context));

Database, but may be used with support of the storage vendor as long as they do not interfere with the expected operation of Greenplum Database at the discretion of VMware. Greenplum Database can be deployed transfer rates are reported in megabytes (MB) per second. If the summary transfer rate is slower than expected (less than 100 MB/s), you can run the network test serially using the -r n option to obtain per-host locales only if you actually need them. Troubleshooting Locales If locale support does not work as expected, check that the locale support in your operating system is correctly configured. To check what

Database, but may be used with support of the storage vendor as long as they do not interfere with the expected operation of Greenplum Database at the discretion of VMware. Greenplum Database can be deployed variable generation issue caused when symlinks were pointing to alternative locations than the ones expected. 12419 : Resolves an issue where Greenplum Database, during node recovery, generated an error in an empty set. 30946 - Query Optimizer : A query on a table with a btree index ran longer than expected because the Query Optimizer did not perform partition elimination when the query included an index

медленные за счет дополнительных фетчей из памяти Метод цепочек 13 13 Метод цепочек 14 14 Пример: std::unordered_map 1. Стабильность указателей на ключ, значение 2. Возможность хранить большие объекты Хеш-таблица Время ClickHouse HashMap 7.366 сек. Google DenseMap 10.089 сек. Abseil HashMap 9.011 сек. std::unordered_map 44.758 сек. Бенчмарки 28 28 perf stat -e cache-misses:u ./integer_hash_tables_and_hashes Cache misses ClickHouse HashMap 329,664,616 Google DenseMap 383,350,820 Abseil HashMap 415,869,669 std::unordered_map 1,939,811,017 Бенчмарки 29 29 http://norvig.com/21-days.html#answers Бенчмарки

If this parameter is set to on then, during an insert, an error is reported if the data is not expected in the partition. If you receive these errors, redistribute or rebuild the affected table. 33062 file. 16193 Resolves an issue where queries were failing because a variable was not found where expected. 15963 Introduces a new check for gpmmon process to make sure gpdb_get_master_data_dirsets themaster_data_dir` where the end of a buffer coincided with the end of the data (and therefore does not include an expected newline character). 32151 Resolves a gpfdist crash that could occur during session clean up if