[Presto] common commands of Presto

Preface

Connection command

java -jar presto-cli-0.269-SNAPSHOT-executable.jar --server  localhost:8080 --catalog hive

• –server yes presto Service address ;

• –catalog Which data source is used by default , You can also switch later , If you want to connect mysql data source , Use mysql Data source name is enough ;

• –user Is the user name ;

Check the information

View data sources (catalog)

show catalogs;

see schemas

show schemas from 'catalog_name';

see tables

show tables from 'catalog_name.schema_name'

JMX

Query memory pool information

SELECT freebytes, node, object_name
FROM jmx.current."com.facebook.presto.memory:*type=memorypool*";

Query the open and maximum file descriptor count of each node

SELECT openfiledescriptorcount, maxfiledescriptorcount
FROM jmx.current."java.lang:type=operatingsystem";