savepoint

Transactions are the basic unit of database operations in Oracle 9i, and 3 transaction control commands can be used in pl/sql programs. Commit command A commit is a transaction commit command. In Oracle 9i databases, in order to ensure data

ado| Data transactions in Ado.net Ado.net supports two transaction models, which are in the. NET Framework documentation is defined as a guide. The Transaction Guide manual describes the database transactions that should normally be known, and it

server| Transaction Processing Transaction definition: A transaction is a single unit of work. If a transaction succeeds, all data changes made in that transaction are commit to become a permanent part of the database. If the transaction encounters

1. Data Query Language (SELECT statement): for retrieving database data 2. Data manipulation language (manipulation Language,dml): Used to change database data, including insert,update and delete three statements 3. Transaction control Language

oracle| Control | data | Detailed transaction control transaction control includes coordinated access to multiple synchronizations of the same data.　　When a user changes the data that another user is using, Oracle uses transaction control who can

Oracle Introduction to Database Transactions A database transaction is a logical unit of work that consists of a set of SQL statements. You can think of a transaction as an irreducible set of SQL statements that are permanently recorded in the

The origin of 11.4.1 affairs When you update a database with the delete command or the update command, you can only manipulate one table at a time, which can cause data inconsistencies in the database. For example: The enterprise cancels the

Sequence In order to write stored procedures in the work,. At the same time, I'm going to write a study note on "Mastering Oracle 10g Pl/sql Programming" (Water Conservancy and hydropower). Can you write all this: Data Query Language--select Data

The savepoint (savepoint) is a flag in the transaction process that is used in conjunction with the rollback command (ROLLBACK), and the main purpose is to allow a user to roll back a section of processing without having to roll back the entire

Global declarative Temporary tables Temporary tables are often used to store temporary data and intermediate results. Because they do not require logging and are not present in the system catalog, they can improve performance. In addition, because

oracle| Control | data | detailed Insert Data    INSERT statements are often used to insert rows into a table, there can be special data fields in rows, or you can use subqueries to create new rows from existing data. The    column directory is

Insert statement Syntax: INSERT into table [(Column1, Column2 ...)] VALUES (value1, value2 ...); Description: INSERT statement inserts a record into the table at a time. When the default field Name list is listed, you should explicitly set the new

The origin of 11.4.1 Affairs When you update a database with the delete command or the update command, you can only manipulate one table at a time, which can cause data inconsistencies in the database. For example: The enterprise cancels the

Enhancements to DB2 JDBC Universal Driver in the DB2 UDB v.8.2 allow developers to enjoy amazing performance and manageability. DB2 Universal Database (UDB) version 8.2 on Linux, Unix, and Windows platforms supports many types of Java programs,

oracle| Data | database | Cursor SQL is the language used to access the Oracle database, Pl/sql expands and strengthens the functionality of SQL, while introducing stronger program logic. Pl/sql supports DML commands and SQL transaction control

Triggers enable consistency and completeness of data between tables. When a base table is modified, the corresponding trigger is automatically executed. Operations on table data are inserted, modified, and deleted, and the corresponding triggers for