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In the Oracle Partition Table operation, when a partition already has the largest partition, how can we expand the partition again? The simple method is to first Delete the largest partition and then add the required partition. In the Oracle

Auto increment of ID fields in the SQL _Oracle table Objective: To automatically increment the ID field when inserting data into a table. Start the experiment: (1) Create an experiment table Createtable test_ID_add ( Id number (10 ), USERNAME

http://blog.chinaunix.net/u2/66903/showart_2082884.htmlOracle uses a number of different audit methods to monitor what permissions to use and which objects to access. Auditing does not prevent the use of these permissions, but it can provide useful

In Oracle8i or later, you can create the following two types of temporary tables:1. Session-specific Temporal tablesCREATE Temporary table_name>column specification>onCOMMIT PRESERVE ROWS;2. Transaction-specific temporal tablesCREATE Temporary

In the Oracle database, Undo has three main functions: providing a consistent read (consistent read), rolling back the transaction (Rollback Transaction), and instance recovery (Instance Recovery).Consistent reads are relative to dirty reads (Dirty

A new feature in 11g is the partition table for the system, and here's an experiment:Sql> select * from V$version;BANNER--------------------------------------------------------------------------------Oracle Database 11g Enterprise Edition Release 11.

Imitating the example of Oracle performance diagnostics in two experiments, the book says that if you don't use relies_on, the change action on the object that the function depends on does not cause the result cache to fail operation (Result_cache

If you use global temporary tables and sequence, you may encounter some problems. Because global temporary tables are associated with sessions (or transactions in a session), sequence is related to the database level.In 12C, you can create a

Two test samples were made in the art of simulating Oracle performance diagnostics. The book says not to bear relies_on. Cache (Result_cache relies_on (test1,test2)). The test proved incorrect, and the function F1 () did not use relies_on, but the

Temporary tables: Like normal tables, there is a structure, but the management of the data is not the same, the temporary table stores the transaction or the intermediate result set of the session, the data saved in the temporary table is only

Hibernate if you are using directSession.update (Object o);All the fields in this table will be updated again.Like what:public class Teacher Test { @Test public Void Update () { Session session = Hibernateuitl.getsessionfactory () .

Oracle database The process of creating temporary tables and the contrast with the different points of the SQL Server Temp table is the main content of this article, let's take a look at this part of the content, we hope to be able to help you. 1.

In the partitioning table operation, when a partition already has the largest partition, how do you extend the partition again? The simple way is to delete the maximum partition first, then add the required partition and build the maximum partition

I. EXPLICIT cursorExplicit is relative to the implicit cursor, that is, there is a clear declaration of the cursor. The declaration of an explicit cursor is similar to the following (specific syntax for Plsql ref doc):Cursor cursor_name (parameter

Oracle 11G, the database default is the audit function, so sometimes we forget to turn off this feature caused the system table space is full, but because the shutdown audit function needs to restart the database, such operations are not allowed in

In hive, standard SQL is used to implement intra-group sorting in hive. To implement intra-group sorting, you generally write your own udf to implement the analysis function row_number () over (partition) in oracle, if you do not use a user-defined

In general, we can use the TRUNCATE or DELETE statement to DELETE records in the table. The TRUNCATE statement is usually more efficient, but you need to pay attention to it. TRUNCATE is a DDL statement, which means that Oracle will automatically

Primary Key constraints automatic index creation constraints are used to ensure the integrity of database data. In oracle databases, you can use constraints, triggers, and application code (processes, functions) to achieve data integrity, among the

The secret of ROWID table each data row has a row header, where The number of columns contained in The row data and The lock mark are stored. When a transaction updates a record, it will record the ITL Slot Number and lock mark used in the header of

Modify the default XDB listening port Oracle9i default xml db to set the default HTTP port to 8080. This is a very common port, which is used by many other webservers, if we have installed it, we 'd better modify it to avoid conflicts. If we don't