mysql> SHOW TABLES; +---+ | Tables in employees | +---+ | employee_data | +---+ 1 rows in set (0.00 sec) To delete the table, we issue a DROP table command.DROP TABLE employee_data; Query OK, 0 rows affected (0.01 sec) Now, we won’...
To update the tables to the expected structure, perform the MySQL upgrade procedure. See Upgrading MySQL. Another option for creating accounts is to use the GUI tool MySQL Workbench. Also, several third-party programs offer capabilities for MySQL account administration. phpMyAdmin is one such ...
However, after I drop these tables, the DB size doesn't decrease. The existing tables should take 10-15GB in size (e.g., if they were exported as CSV files, they would be 10-15GB). However, the database plus a couple indexes are now 50GB. For reference, we're using MySQL 5.0...
Category:MySQL Server: InnoDB storage engineSeverity:S2 (Serious) Version:5.7.17OS:Any Assigned to:CPU Architecture:Any [11 Aug 2018 3:57] Jesper wisborg Krogh Description:When dropping large tables if can cause semaphore waits so that no other queries can be run while the DROP TABLE is in...
Check if table exists in mysql [duplicate] Question: Is it possible to determine if a table exists without utilizing the "select from" statement? Is it possible to trust this query to determine the existence of tables in the specified database, or are there any potential limitations?
SQL> select segment_name,bytes/1024/1024/1024 "size in Gbytes" from user_segments where segment_name='TV'; SEGMENT_NAME size in Gbytes --- --- TV 547.25 SQL> select NUM_ROWS,BLOCKS from user_tables where table_name='TV'; NUM_ROWS BLOCKS --- --- 859150100 65649786...
MySQL Server - Version 5.7 and laterInformation in this document applies to any platform.SymptomsWhen dropping a large table (issue definitely seen with 256+GB size tables), InnoDB stops responding for the duration of the DROP TABLE. The output of the InnoDB monitor includes semaphore waits simil...
In SQLite, the CREATE statement is used to create tables, indexes, views, and triggers. The ALTER TABLE statement changes the structure of a table. The DROP statement removes tables, indexes, views, or triggers. SQLite create tableThe CREATE statement is used to create tables. It is also ...
SELECT update_time FROM information_schema.tables WHERE table_name='tablename' To see time last accessed in general, you can use the audit plugin for MySQL Enterprise edition that allows you to see which users ran which queries per connection. The Audit Record itself has some customization opt...
, then I would like to only grab the non-critical information from the tables. I don't think it is possible to link a save query (I can be wrong), but I've learned that you can duplicate and link a virtual table which turns to VIEW. Is there a way to drop a column in view?