How many types of logs are there in MySQL?
5.4 MySQL Server Logs
| Log Type |
Information Written to Log |
|
Error log |
Problems encountered starting, running, or stopping mysqld |
| General query log |
Established client connections and statements received from clients |
| Binary log |
Statements that change data (also used for replication) |
Which SQL command do you use to force MySQL to start new log files? You can force MySQL to start using new log files by using mysqladmin flush-logs or by using the SQL command FLUSH LOGS. If you are using MySQL Version 3.21 you must use mysqladmin refresh.
What is audit log in MySQL? When installed, the audit plugin enables MySQL Server to produce a log file containing an audit record of server activity. The log contents include when clients connect and disconnect, and what actions they perform while connected, such as which databases and tables they access.
How do I delete a MySQL log file?
How to remove and purge old MySQL binary log files
- Step 1: Check binary logs size under the dump directory.
- Step 2:Connect DB and show MySQL binary logs.
- Step 3: Remove old Binary logs.
How many types of logs are there in MySQL? – Additional Questions
Where are MySQL bin logs stored?
The MySQL binary logs and index files are saved in the C:ProgramDataMySQLMySQL Server 8.0 directory. We can change the default location of the binary logs.
What does reset master do?
RESET MASTER removes all binary log files that are listed in the index file, leaving only a single, empty binary log file with a numeric suffix of . 000001 , whereas the numbering is not reset by PURGE BINARY LOGS . RESET MASTER is not intended to be used while any replicas are running.
How do I purge a table in MySQL?
Use the following procedure to perform the truncate table operation using the MySQL CLI:
- Log in to your hosting account using SSH: mysql -u [username] -p [database_name) For example: mysql -u johndoe -p data_mysite.
- Enter your password.
- Execute: truncate table [table_name]
How do I rename a table in MySQL workbench?
The syntax to rename a table in MySQL is: ALTER TABLE table_name RENAME TO new_table_name; table_name. The table to rename.
How do I TRUNCATE a table in SQL Workbench?
Here is the basic syntax of the TRUNCATE TABLE statement:
- TRUNCATE [TABLE] table_name;
- CREATE TABLE books ( id INT AUTO_INCREMENT PRIMARY KEY, title VARCHAR(255) NOT NULL ) ENGINE=INNODB;
- CALL load_book_data(10000);
- SELECT * FROM books;
- TRUNCATE TABLE books;
How do I TRUNCATE a single column in SQL?
You can use the TRIM (or LTRIM or RTRIM) functions to remove spaces or other characters from the left or right of a string. You can use the LEFT function in SQL Server, or the SUBSTR function in Oracle SQL, to return a string with a specific number of characters from a larger string.
How do I rename a column in SQL?
ALTER TABLE table_name RENAME TO new_table_name; Columns can be also be given new name with the use of ALTER TABLE. QUERY: Change the name of column NAME to FIRST_NAME in table Student.
How do you purge a table in SQL?
To remove all data from an existing table, use the SQL TRUNCATE TABLE order. You can also use the DROP TABLE command to delete an entire table. But Truncate will remove the entire table structure from the database, and you will need to recreate the table if you want to store any data.
How do I remove extra zeros from decimals in SQL?
- Convert it to string using STR TSQL function if not string, Then.
- Remove both leading & trailing zeros SELECT REPLACE(RTRIM(LTRIM(REPLACE(AccNo,’0′,’ ‘))),’ ‘,’0’) AccNo FROM @BankAccount.
- More info on forum.
What is double precision in SQL?
The DOUBLE PRECISION data type stores 64-bit floating-point values (8 bytes). The precision of a DOUBLE PRECISION column is 15 digits. FLOAT and FLOAT8 and are valid synonyms for DOUBLE PRECISION. Leading zeroes and whitespace characters are allowed. Trailing whitespace characters are also allowed.
How do you ROUND to the next integer in SQL?
The ROUND() function in MySQL is used to round a number to a specified number of decimal places. If no specified number of decimal places is provided for round off, it rounds off the number to the nearest integer.
How do you remove trailing spaces in SQL?
SQL Server TRIM() Function
The TRIM() function removes the space character OR other specified characters from the start or end of a string. By default, the TRIM() function removes leading and trailing spaces from a string.
What is white space in SQL?
What exactly is ‘white space’? White space is a character in a string that represents horizontal or vertical space in typography. In other words: tabs, line feeds, carriage returns and, yes, spaces. A white space has character value, just like ‘A’, ‘B’ and ‘C’ have a value.
How do I trim a right character in SQL?
Remove first character from string in SQL Server
- Using the SQL Right Function.
- Using the Substring Function. Declare @name as varchar(30)=’Rohatash’ Select substring(@name, 2, len(@name)-1) as AfterRemoveFirstCharacter.
How do you delete blank rows in SQL query?
Use the delete command to delete blank rows in MySQL. delete from yourTableName where yourColumnName=’ ‘ OR yourColumnName IS NULL; The above syntax will delete blank rows as well as NULL row. Insert some records in the table using insert command.
How do I remove a NULL column in SQL query?
SELECT column_names FROM table_name WHERE column_name IS NOT NULL; Query: SELECT * FROM Student WHERE Name IS NOT NULL AND Department IS NOT NULL AND Roll_No IS NOT NULL; To exclude the null values from all the columns we used AND operator.
How do you delete a row in Excel if a column is blank?
This example teaches you how to delete blank rows or rows that contain blank cells.
- On the Home tab, in the Editing group, click Find & Select.
- Click Go To Special.
- Select Blanks and click OK.
- On the Home tab, in the Cells group, click Delete.
- Click Delete Sheet Rows.
- Add a Blanks column and insert the COUNTA function.
