Oracle

Dbms_xplan is a package that Oracle provides to view SQL plans, including execution plans and interpretation plans, and I used the set autotrace command when I looked at the SQL execution plan, but now it seems that Dbms_ The Xplan package gives a

1, su–oracle is not necessary, suitable for use without DBA password, you can enter the Sqlplus interface without password. 2, Sqlplus/nolog or Sqlplus system/manager or./sqlplus system/manager@ora9i; 3, Sql>connect/as sysdba; (as Sysoper)

We all know that before 9i, it would be a hassle to get the statements to build tables and indexes. We can come here through the export with Rows=no, but its output is not directly available because of the format problem. Another approach is to

Oracle database is favored by more and more enterprises because of its high reliability, security and compatibility. How to keep Oracle databases in good performance is a concern for many database administrators and may be considered in the

The Oracle tutorial you are looking at is the strategy for Oracle datasheet partitioning. This article describes the need to partition the hospital information system by statistical analysis of the table, the need to partition the table to select

Write the first JSP program that connects Oracle Test.jsp 1, connect into the Sql*plus Log in as a System/manager user, Sql> Conn System/manager Create a new user: such as USER1/PASS1, give Connect,resource permissions. Sql> Grant Connect,resource

ORACLE 10G modified character encoding, no longer troublesome, no super character set limit, you can directly modify the string you want, but may already exist before the data may be displayed incorrectly, you need to re-import The modification

The Securefile feature is a fully redesigned implementation of the large object (LOB) storage format in Oracle 11g, the original LOB storage format now known as Basixfile, which is still the default storage method, but the Securfile keyword opens a

First step, at the cmd command line, enter Sqlplus In the second step, enter the username and password according to the prompts 1. View processes and Sessions parameters Sql> Show parameter processes NAME TYPE VALUE Db_writer_processes Integer 1

As many Oracle users know, there is always a security risk in Oracle's listeners, and if no security is set up for this, users who can access them can turn off the listener remotely. The relevant examples are as follows: D:>lsnrctl Stop

When a deadlock occurs in an Oracle database, the following processing steps can be used to resolve it: The first step: try to delete the SQL command in the Sqlplus , if you can delete the success, then everything! However, in general, when a

First, create a stored procedure Get_clob: T_name: The name of the table to query, F_name: The name of the field to query, u_id: The primary key of the table, the query condition, L_pos: The beginning position of the interception; L_amount:

Configuration environment: 1. Database: Oracle 8i R2 (8.1.7) for NT Enterprise Edition 2, Installation path: c:oracle Implementation method: 1.d:>set Nls_lang=american_america. USACII7 Or D:>set Nls_lang=american_america. We8iso8859p1 D:>set Direct

1, see what users in the database? Select username from all_users; 2. See which DBA users are in the database? Select username from dba_users; 3. See what tables The current user owns? Select table_name from User_tables; 4, Oracle New table

Today, I met a software requirement to install the Oracle client side, so I considered a compact version from the http://www.oracle.com/technology/software/tech/oci/instantclient/ index.html downloads Instantclient-basic-win32-10.2.0.4.zip, which

1, primary key and foreign keyPrimary key: A record in a relational database has several attributes, if one of the attribute groups (note is a group, can be one, can be multiple) can uniquely identify a record, then the attribute group is the

The following is an operation to connect to a database using a connection pool under a Tomcat server One: Modify the Web.xml file: Copy Code code as follows: project index.html index.htm index.jsp default.html default.htm

In this case, the automatic growth column refers to the automatic growth of the primary key ID in a table. Unlike MySQL, Oracle cannot set the automatic Growth column feature when create tables. Oracle must create a sequence sequence to automate

One, cannot export the reason of empty table1, oracle11g default to empty table does not assign segment, so use EXP export oracle11g database, empty table will not export. 2, set the Deferred_segment_creation parameter is false, whether it is empty

Row_number () over (PARTITION by COL1 ORDER by COL2) Represents a grouping based on COL1, sorted by COL2 within a group This value represents the sequential numbering of each group's internal sorting (a sequential unique within the group) Rank ()