Truncate table updating statistics


27-Oct-2017 09:32

Automatic statistics (abbreviated autostats) provides automatic maintenance of column statistics.Statistics are collected and incrementally updated in the background as the table is modified with DML statements such as .In Mem SQL 6.0 and later, column statistics on columnstore tables are automatic by default.Automatic statistics collection is not currently supported for rowstore tables or for range statistics./bin/bash # Enables autostats on all columnstore tables which currently have autostats disabled # # Run this bash script with the mysql client arguments you use to connect to the Mem SQL master aggregator, like: # bash -h # # Use the --dry-run option to only print the list of tables which would be altered, without actually running the ALTER commands.set -e client_args=(mysql --batch --skip-column-names) dry_run=false while "$dry_run" == false then $ -e "ALTER TABLE $table ENABLE AUTOSTATS" fi fi done command.

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Automatic statistics (abbreviated autostats) provides automatic maintenance of column statistics.

Statistics are collected and incrementally updated in the background as the table is modified with DML statements such as .

In Mem SQL 6.0 and later, column statistics on columnstore tables are automatic by default.

Automatic statistics collection is not currently supported for rowstore tables or for range statistics.

/bin/bash # Enables autostats on all columnstore tables which currently have autostats disabled # # Run this bash script with the mysql client arguments you use to connect to the Mem SQL master aggregator, like: # bash -h # # Use the --dry-run option to only print the list of tables which would be altered, without actually running the ALTER commands.

set -e client_args=(mysql --batch --skip-column-names) dry_run=false while $# -gt 0 do case "$1" in --dry-run) dry_run=true ;; *) client_args =("$1") ;; esac shift done # List of table names (fully qualified and quoted) tables=$($ -e "select concat(table_schema, '.\`', replace(table_name, '\`', '\`\`'), '\`') from information_schema.tables where table_type = 'BASE TABLE'") echo "$tables" | while read -r table do show_create_table=$($ -e "show create table $table") if echo "$show_create_table" | grep -q "AUTOSTATS_ENABLED=FALSE" then echo "ALTER TABLE $table ENABLE AUTOSTATS" if "$dry_run" == false then $ -e "ALTER TABLE $table ENABLE AUTOSTATS" fi fi done command.

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To enable autostats on existing columnstore tables created prior to the upgrade, which we recommend in most cases, run #!

It uses whatever set of statistics would currently be used by for query optimization - for column statistics on autostats-enabled tables, this would be the automatic statistics if they are enabled and up-to-date, and otherwise the statistics last saved by directory of the Mem SQL instance.