Oracle

Modify the clob field in the oracle database in Java code www.2cto.com // String sqlsel2 = "select jsonbody from db_ps_listcatalog where" + // "listtype = 'sh11' for update "; // String col = "jsonbody"; public boolean updateClob (String SQL, String

Step 1. telnet to the remote database server CMD> telnet to the remote database IP address www.2cto.com 2. Switch to the Database User DQXXDBS01: /> su-oracle 3. Use a super user to access the database $ sqlplus "/as sysdba" 4. view the parameters,

ORA-01460: the conversion request cannot be implemented or unreasonably solved oracle10g Database execution database update SQL error: www.2cto.com Caused by: java. SQL. SQLException: ORA-01460: conversion requests cannot be implemented or

Processing of null values when order by is used in oracle: When oracle sorts query results, null values exist in the column to be sorted, specify the NULL value at the beginning or at the end of the www.2cto.com Keyword: Nulls First; Nulls Last

Database paging query keyword SQL code www.2cto.com 1. select * from (select. *, rownum rc from table name where rownum = startrow common paging syntax for oracle. Assume that select * from (select t. *, rownum from (select * from table1 where

Oracle tools: analyze (I) three major functions www.2cto.com ① collect and delete indexes, statistical information of tables and clusters ② verify the structure of tables, indexes and clusters ③ identification tables and cluster and row migration

Oracle modifies the default time format 1. insert the current time to the database insert the current date to oracle (using sysdate) Example: insert into table (date) value (sysdate ); // insert is system time and date time accurate to day current

Oracle Linux Sqlplus client 1. install the oracle-instantclient11.2-basic-11.2.0.1.0-1.x86_64.rpm oracle-instantclient11.2-sqlplus-11.2.0.1.0-1.x86_64.rpm command www.2cto.com respectively as follows: rpm-ivh package name 2. add dns and other

Oracle sqlnet. ora configures sqlnet. the role of ora (As pointed out on the official website) www.2cto.com 1. restrict client access (for example, if the specified client domain is not allowed) 2. specify the naming method (local naming, directory

If the maximum number of opened cursors is exceeded, the following error occurs in the recent project: java. SQL. SQLException: ORA-01000: maximum open cursors exceededat oracle. jdbc. driver. databaseError. throwSqlException (DatabaseError. java: 11

PL/SQL daily question: negative output question: Which options output a negative number? If you are sure that none of the following is correct, select E [SQL] www.2cto.com A DECLARE l_date2 DATE: = date '2017-12-20 '; l_date1 DATE: = l_date2-1;

Oracle-20SEP-date format conversion to 9-20 and compare size date format conversion: SQL> select to_char (to_date ('01sep', 'ddmon ', 'nls _ date_language = American '), 'Mm-dd') from dual; TO_CHAR (TO_DATE ('01sep ', 'ddmon -------------------------

Export the table structure in Oracle to word. When exporting the table structure in Oracle to word, you need to use the database-developed table structure when writing the development document. You have found an SQL statement on the Internet, the

The following SQL statement can be used to test the database performance 2 hours after the Oracle check hit rate starts. buffer hit rate: www.2cto.com buffer hit rate indicates the select (1-(sum (decode (name, 'Physical reads', value, 0)/(sum

In oracle decode, if the result of the decode function is an aggregate function, you must add the value or item of the decode judgment to the group by statement, for example, www.2cto.com select. C _ FUNDCODE, A.D _ REGISTERDATE, DECODE (. C _ FLAG,

Oracle redo log wait events these two days found that the development database, when running some small DML transactions, will often appear log buffer space events, then, four groups of redo logs are increased to 300 mb. After the log buffer

Oracle Installation Error ora-00922 (missing or invalid option) This error occurs when you create a database instance while installing Oracle 11g R2, if you select ignore, A ora-28000 error is reported. After network query and verification, this is

The use trap OF the INSTEAD trigger for views associated with more than two tables, Oracle cannot tell which table should be updated, and the INSTEAD trigger meets our requirements for the view DML, the display tells Oracle which table www.2cto.com

The process of establishing a complete database by the oracle database file recently helped the teacher write some functions of the website management system. Because it is not in the same place, the teacher sent me a library file (subsequently

OCP question analysis _ 007: sequence can be designed to be unique, but continuous instances cannot be implemented. sequence disconnection number, transaction rollback, sequence disconnection number, concurrent access, sequence may be disconnected ..