Database security needs the allowing or disallowing user actions on the database and the objects within it. When a user will create a database application, the security policy is the first step. An application security policy is a list of application security requirements and rules that regulate user access to database objects. In this chapter …
Here, in this section you will study about different general security issues in MySQL. Security Guidelines Always keep in mind the following security guidelines before working with MySQL. Do not permit or allow anyone to access the user table in mysql database, except the MySQL root account. Always use GRANT and REVOKE statements to control access to …
Here, in this section you will study about different Access Privilege Systems. Privileges Provided by MySQL Here, MySQL provides privileges that apply in different contexts and at different levels of operation: Administrative privileges allow users to manage operation of the MySQL server. These privileges are global because they are not specific to a particular database. …
Here , in this section you will learn about User Account management in different ways. UserNames and Passwords MySQL stores accounts in the user table of the mysql database. An account is defined in terms of a username and the client host or hosts from which the user can connect to the server. The account …
A transaction is a logical unit of work that contains one or more SQL statements. Transactions are atomic units of work that can be committed or rolled back. When a transaction makes multiple changes to the database, either all the changes succeed when the transaction is committed, or all the changes are undone when the …
To understand the concepts of a transaction take an example of CSIT banking database. Suppose a user transfers money from his/her savings account to his current account the statement will be divided into four blocks: Debit Saving Account Credit Current Account Record in Transaction Journal End Transaction The statement to debit SB a/c is as …
ACID stands for Atomicity, Consistency, Isolation and Durability. It is a set of properties that guarantee that database transactions are processed reliably. In MySQL, InnoDB storage engine supports ACID-compliant features. Atomicity: The atomicity aspect of the ACID model mainly involves InnoDB transactions. MySQL features include: Autocommit setting. COMMIT statement. ROLLBACK statement. Operational data from the INFORMATION_SCHEMA …
MySQL in version 5.6 supports local transactions means within a given client session through statements such as SET autocommit, START TRANSACTION, COMMIT, and ROLLBACK. Syntax of START TRANSACTION, COMMIT, and ROLLBACK: START TRANSACTION transaction_characteristic [, transaction_characteristic] …] transaction_characteristic: WITH CONSISTENT SNAPSHOT | READ WRITE | READ ONLY BEGIN [WORK] COMMIT [WORK] [AND [NO] CHAIN] [[NO] …
In MySQL some statements cannot be rolled back. DDL statements such as CREATE or DROP databases, CREATE, ALTER or DROP tables or stored routines. You should design a transaction without these statements. The statements listed below implicitly end any transaction active in the current session, as if you had done a COMMIT before executing the …
MySQL statements that cannot be Rolled Back and statements that cause an implicit Commit Read More »
InnoDB supports the SQL statements SAVEPOINT, ROLLBACK TO SAVEPOINT, RELEASE SAVEPOINT and the optional WORK keyword for ROLLBACK. The SAVEPOINT statement sets a named transaction savepoint with a name of identifier. If the current transaction has a savepoint with the same name, the old savepoint is deleted and a new one is set. The ROLLBACK TO SAVEPOINT statement rolls …
SAVEPOINT, ROLLBACK TO SAVEPOINT, and RELEASE SAVEPOINT Read More »
MySQL allows client sessions to acquire table locks explicitly for the purpose of cooperating with other sessions for access to tables, or to prevent other sessions from modifying tables during periods when a session requires exclusive access to them. A session can acquire or release locks only for itself. One session cannot acquire locks for …
SET [GLOBAL | SESSION] TRANSACTION transaction_characteristic [, transaction_characteristic] … transaction_characteristic: ISOLATION LEVEL level | READ WRITE | READ ONLY level: REPEATABLE READ | READ COMMITTED | READ UNCOMMITTED | SERIALIZABLE Let us describe you the Syntax in brief: With the GLOBAL keyword, the statement applies globally for all subsequent sessions. Existing sessions are unaffected. With …