Database Administrator

Invalid Oracle compilation user object When using the IMPDP/IMP tool to migrate data, a warning is often prompted for invalid objects, which must be handled as follows. 1. query invalid objects of the specified user Su-Oracle Sqlplus/as sysdba SQL>

03. Linear table (2) chain storage structure. Single-chain table 1, chain-chainChain storage structure. Single-chain table 11. Basic ConceptsTo express the logical relationship between each data element ai and its direct successor Data Element ai + 1

How to view User usage (recent logon, activity ...), Logon Activity 1. Make sure the database has opened Audit SQL> show parameter auditNAME TYPE VALUE----------------------------------------------------------------------------------------Audit_file_

ORACLE Stored Procedure instance [memorandum], oracle Stored Procedure Statistical report: the number of user logins (platform clicks) at the beginning of each month. The scheduled tasks count the number of logins, number of Logon accounts, and

SQL vertical table to horizontal table, SQL vertical table Converts a vertical table to a horizontal table in the database. Database vertical table data The SQL statement is as follows: Select cardid, max (case t. projectcode when 'ia-002'

MySQL suppresses the binlog part in the BINLOG part, and mysql suppresses the binlog part. MySQL uses binlog to record the entire data change process. Therefore, we only need MySQL binlog to completely restore the database. There are three different

Oracle 11g backup-based rman duplicate, rmanduplicateBackup-based rman duplicate command to create standby databasePrerequisites: ensure the backup of the original database and archive is completely visible to the standby end,It is assumed that the

Suggestions on the size of the initial SGA database and the size of the PGA database, sgapga1. Background information Many new business systems are launched, and most DBAs do not understand the business, so they are bored with the header database

The disk space of the DG slave database is full, leading to the failure to create an archive.Last Friday, I went to a customer to perform database inspection. It was the database of a 10 Gb NC System on Windows 2008 and configured with DG. However,

Mongodb replica set priority settings, mongodb replica priorityWhen you set a mongodb replica set, the Primary node, second node, and arbitration node may have unbalanced resource configurations (CPU or memory). Therefore, some nodes must not be

Mongo-js-20141126, JavaScript#! /Bin/sh# Create a 0-byte document. If yes, clear it.:> SubsidiaryCode.txtTlist = 'cat./AccountGuid.txt ';For I in $ tlistDoTEMP_LIST = $ I;# Print the value obtained from $ TEMP_LIST.# Printf "AccountGuid: $ TEMP_LIST

SQL statements for linux-SELECT and select What is SQL used? The most common method is to select data from the database table. From this answer, we can immediately see two keywords:FROM (FROM)Tables in the databaseSELECT). (A table is a structure in

How to diagnose cursor pin s wait on x Series 2, cursorpin How to analyze diagnostic collection information 1. view the content of high paring and high version in the AWR report.   For more information, see 'sqlordered by Parse call' or 'SQL

Oracle table connection and oracle connectionI. nested loop PrincipleA nested loop connection is a two-layer nested loop that matches two tables in sequence and returns the table join method of the returned result set.In the following SQL statement,

Concatenates Oracle and MySQL strings and oraclemysql strings I. MySQLIn java, we usually use the plus sign (+) to concatenate strings. in MySQL, we can also use the plus sign (+). For example: Add test data first CREATE TABLE test( id INT,

Mybatis supports one-to-multiple database relationships by using the "set nested query" and "set nested result" methods. The two entity classes are as follows: User class and Goods Commodity class. One user corresponds to multiple products (one to

[EBS] adpatch error: libgcc_s.so: undefined reference to '_ stack_chk_fail@GLIBC_2.4', adpatchlibgcc_s.so Error reported by EBS patching through adpatch /Usr/lib/gcc/x86_64-redhat-linux/4.4.7/32/libgcc_s.so: undefined reference to '_

Database integrity and database integrity constraintsDatabase integrityDatabase integrity refers to the correctness and compatibility of the database. data correctness refers to the accuracy of the database value, that is, the data type must be

Using the oracle Stored Procedure generation tree encoding, the oracle Stored ProcedureRequirements for generating tree encoding using oracle stored procedures Field Description Remarks ID Primary Key, 32-bit UUID  

MySQL returns the update value (RETURNING) and mysqlreturningIn SQL writing, such as updating a row of records, you must obtain the updated row. From the perspective of the program itself, there is no difficulty, it is a big deal to cache this line,