Oracle

(1) select host. id from itr_host_v host left join itr_ci_ref r on host. id = r. to_ci and r. from_template_id = '000000'; (2) select host. id from itr_host_v host, itr_ci_ref r where host. id = r. to_ci (+) and r. from_template_id (+) = '000000'; (3

Oracle view locked tables and unlockView the locked table select p. spid,. serial #, c. object_name, B. session_id, B. oracle_username, B. OS _user_name from v $ process p, v $ session a, v $ locked_object B, all_objects c where p. addr =. paddr and.

Deduplication of duplicate data in oracle tables is mainly illustrated by an example.Create table t1 as select * from all_objects; insert into t1 select * from all_objects where rownum The first method is the set method select * from t1 where rowid

In Oracle 9, The dbstart command does not respond or report errors. 1. solution to the problem where dbstart does not respond: vi/var/opt/oracle/oratab change the N value after the corresponding instance name to Y. For example:

Create temporary tablespace: create temporary tablespace test_tempTEMPFILE 'd: \ app \ Administrator \ oradata \ orcl \ test_temp01.dbf 'size 32 mautoextend on next 32 m maxsize 2048 mextent management local; CREATE user TABLESPACE: create

The date value intercepted by the 1.1.TRUNC (for dates) TRUNC function for the specified element. The specific syntax format is as follows: TRUNC (date [, fmt]) Where: date is a date value in the fmt date format, which will be truncated by the

Tables store information about associated databases. Only Oracle databases can read and write these tables. Most users cannot access these tables because most of the data is stored in encrypted format. The following query returns all objects in USER

If PLSQL select into is null, the following error is returned: select column into t_prop In the stored procedure... If no value is found, an error is returned. The processing method is to use an aggregate function, for example, [SQL] create or

Programmers often need to connect to the database to talk about the oracle database client and server Character Set consistency problem, which can solve Chinese garbled characters, other character garbled problems mainly refer to in sqlplus, I do

Recently, we found that in many cases, you need to query the upper-level organizations or lower-level organizations based on the Organization Code. In this post, we use the instance provided by oracle for testing. The example table is scott. emp:

1. Authorize a user to view sys. v $ SQL _plan permission 2. create a plan_table-like view SQL> create or replace view dynamic_plan_table 2 as 3 select rawtohex (address) | '_' | child_number statement_id, 4 sysdate timestamp, operation, options,

It is found that only the index can be used to obtain the queried data. If the index can be effectively used to obtain the data, it will undoubtedly provide great help for the query performance. However, if the index selection is poor or the index

Log File Management and nologging implementation The purpose of this experiment is to verify the principles of the learned log files and manage and maintain log files. how to Reduce log generation. some subsequent syntaxes are used to overcome them.

ORA-12519, TNS: no appropriate service handler found problem Java code ORA-12519, TNS: no appropriate service handler found The Connection descriptor used by the client was: 110.16.1.17: 1521: orcl www.2cto.com solution: the current number of

The Oracle-distinct usage distinct keyword is used to filter out redundant duplicate records and retain only one record, but it is often used to return the number of records that are not repeated, instead of using it to return all non-record values.

The Thinking and summary of Oracle column-and-column conversion has been working on Oracle-SQL in recent days. It involves some things that are not used at ordinary times, so it has been depressing for a long time here. Now the problem has been

In linux, when oracle deletes a tablespace, an error occurs. Due to insufficient tablespace capacity, the tablespace capacity needs to be increased. Therefore, a new tablespace is created in the original tablespace and added to the original

The stored procedure for returning a result set in Oracle, Unlike SQL Server, In the stored procedure, Oracle uses Select to return a result set. Instead, it uses Out-type parameters to return a result set. It is actually using REF CURSOR--

Rac encounters gc buffer busy problem database version: 10.2.0.5-64 nodes: 2 operating system version: centos 5.6-64 awr report today found gc buffer busy wait time gc buffer busy This wait event, also known as global cache buffer busy prior to

The isolation level analysis of the isolation level (isoation eve) defines the degree of isolation between transactions. Isolation level and concurrency are mutually contradictory: the higher the degree of isolation, the worse the database