Steps for Oracle to execute SQL query statements

Steps for Oracle to execute SQL query statementsThe SQL query statement executed by Oracle is different from that of other statements. If the query statement is successfully executed, the query result is returned. Other types of SQL statements only

Relationship between MySQL mysqld file generation permission and UMASK

Relationship between MySQL mysqld file generation permission and UMASK Today, because of the binlog File Permission issue, the final tracking is that the MySQL installation initialization specifies the permission for the MySQL user to generate the

MySQL Error Log)

MySQL Error Log) Like most relational databases, log files are an important part of MySQL databases. MySQL has several different log files, such as error log files, binary logs, common logs, and slow query logs. These logs help us to define what

Oracle ORA-01555 (snapshot old)

Oracle ORA-01555 (snapshot old) I. Introduction: [Oracle@www.bkjia.com] $ oerr ora 0155501555,000 00, "snapshot too old: rollback segment number % s with name \" % s \ "too small"// * Cause: rollback records needed by a reader for consistent read

Analysis and Solution of ORA-12516 errors

Analysis and Solution of ORA-12516 errors A ORA-12516 error occurs when you use swingbench to perform a stress test on the Oracle database. This error is generally because the number of oracle sessions exceeds the limit, generally because multiple

Create a shell script instance in Oracle

Create a shell script instance in Oracle Code for creating a shell script instance in Oracle: #! /Bin/bash# Ocpyang@126.com# Create user If [$ #-ne 4]; thenEcho-e "\ e [1; 32 m ************************************** **********************************

Oracle RAC background process Introduction

Oracle RAC background process Introduction There are more processes in the Oracle RAC database than in a single instance database. These processes are unique to RAC and are set to implement cluster database functions. This article will introduce RAC-

BitMap indexes are more efficient than B-Tree indexes.

BitMap indexes are more efficient than B-Tree indexes. 1. Experiment description: Operating System: rhel 5.4x86 Database: Oracle 11g R2 Ii. Procedure: Create a t_btree table and create a B-Tree index. The index key is status: SQL> create table

The period for changing the Oracle password is unlimited.

The period for changing the Oracle password is unlimited. Oracle error message ORA-28001: the password has expired, due to new features of Oracle11G, the default password expiration limit for Oracle 11g User Creation is 180 days (6 months ), if the

MySQL Status variable)

MySQL Status variable) The MySQL status variable is the system status information accumulated after the current server is started. It is mainly used to evaluate the usage of the current system resources to further analyze the system performance and

Oracle 11.2.0.2 solve INS-35354 when RAC is installed

Oracle 11.2.0.2 solve INS-35354 when RAC is installed When installing an Oracle 11.2.0.2 RAC database today, the INS-35354 problem occurs: Because the GI of 11.2.0.2 has been successfully installed, and all the status of the Cluster is normal, this

Oracle deletes a shell script instance for a tablespace

Oracle deletes a shell script instance for a tablespace Shell script code for Oracle tablespace Deletion #! /Bin/bash# Ocpyang@126.com# Drop tablespace If [$ #-ne 1]; thenEcho "Usage: $0 TABLESPACE_NAME"Exit 1Fi # Configure oracle env: about oracle

Implement MapReduce in Oracle Database

Implement MapReduce in Oracle Database When programmers develop parallel programs, the Map-Reduce mode is becoming popular. These map-reduce programs usually process large amounts of data in parallel. This article demonstrates how to implement the

Case of configuring static listening to resolve ORA-12514 errors

Case of configuring static listening to resolve ORA-12514 errorsToday, when I configured Linux for DG, I encountered a problem: tnsname. ora file configuration is normal, tnsping is normal, listening is normal, but still reports ORA-12514 error: SQL>

Silent Installation of Oracle 11g R2 in CentOS 5.10

Silent Installation of Oracle 11g R2 in CentOS 5.10 I found many articles about installing Oracle 11g R2 silently in Linux on the Internet, which are messy and varied! Come to the literacy class! Install Oracle 11g R2 in CentOS 5.10 *****************

Binary installation MySQL-5.7.4 Database

Binary installation MySQL-5.7.4 Database MySQL 5.7.4 significantly improves query performance, which is doubled from MySQL 5.6. On the test platform, it can reach 512000 read-only QPS per second, while MySQL 5.6 can only reach 250000 QPS. This

Permission handling for installing Oracle 11g OS in Win7 64bit

Permission handling for installing Oracle 11g OS in Win7 64bit In general, we choose to install Oracle databases in traditional server operating systems such as Linux and AIX. Even in Windows, server versions such as 2008 and 2012 are used as the

Memory_target for Oracle initialization parameters

Memory_target for Oracle initialization parameters I. Introduction: Oracle 9i introduces pga_aggregate_target to automatically adjust the PGA; Oracle 10 Gb introduces sga_target to automatically adjust SGA; Oracle 11g combines these two parts and

Example of Oracle full-text index performance advantages

Example of Oracle full-text index performance advantages 1. Experiment description: Operating System: rhel 5.4x86 Database: Oracle 11g R2 Ii. Procedure: 2.1 create a t_btree table and create a B-Tree index. The index key is object_name: SQL> create

MySQL multi-log table result set splicing Stored Procedure

MySQL multi-log table result set splicing Stored Procedure Generally, MySQL logs only record the log information of the current day. If you need to view the log information within January, You Need To splice the result set of the daily log table,

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