Summary of Oracle SQL Execution Plan and Analysis

Summary of Oracle SQL Execution Plan and Analysis Oracle has multiple ways to obtain a query plan for an SQL statement, such as using the explain plan command and pressing the F5 shortcut in PLSQL Developer. However, it is easier to use it for SQL

View MongoDB replica set again

View MongoDB replica set again Because MongoDB uses memory ing files, the 64-bit version is required. Official: http://www.mongodb.org/downloads Mongodb version used in the lab environment is mongodb-linux-x86_64-2.6.0 Built on three virtual

Relationship between the server parameter file (spfile) in the Oracle 11g parameter file and instance startup

Relationship between the server parameter file (spfile) in the Oracle 11g parameter file and instance startup When the database starts, it needs to read the parameter file to allocate the memory area and locate the location of the control file. The

How to query the values of Oracle hidden Parameters

How to query the values of Oracle hidden Parameters What are hidden parameters? Is used in the system, but Oracle does not officially announce the parameters, these parameters may be those that are not yet mature or used in system development. Log

MySQL 5.6-innodb import Improvement

MySQL 5.6-innodb import Improvement Before MySQL 5.6, the idb file for importing a single innodb table must be aligned with the tablespace id. If the tablespace id is inconsistent, you need to increase the tablespace id by creating a new table in

Use awk to parse dump files

Use awk to parse dump files Dump files are often encountered at work. Sometimes a dump is obtained, but more information is not provided, which may cause problems during import. If a user's default tablespace is user, but the table's tablespace in

Notes for handling ORA-4065 errors

Notes for handling ORA-4065 errors When receiving channel feedback, a user prompts when performing software operations'ORA-4065 not executed, stored procedure Zl_XXXX_Finish changed or deleted', The user tries to re-compile the process and can use

Resolution record of two Oracle configuration problems

Resolution record of two Oracle configuration problems Whether installed or running, the Oracle database involves various relationships with peripheral software and hardware. To smoothly install and run a healthy database system, you must adjust the

Problems and Solutions of impdp ORA-39002, ORA-39166 and ORA-39164

Problems and Solutions of impdp ORA-39002, ORA-39166 and ORA-39164 During performance tests on imp and impdp, we found that if the table contains a lob field, loading is really slow, and there are about 1000 entries per second. At this speed,

8 database management tools suitable for Linux users!

8 database management tools suitable for Linux users! From the content management system to simple tables, databases are part of every development project. This is why developers emphasize the use of the correct type of database tools. The following

Oracle cross-origin access to other instance data in dblink Mode

Oracle cross-origin access to other instance data in dblink Mode When you want to access data in another database table across local databases, dblink of the remote database must be created in the local database, dblink allows you to access data in

Basics of SQLite Database

Basics of SQLite Database 1. Introduction SQLite is an open-source embedded Relational Database Engine for SQL database with self-contained, zero configuration, and transaction support. It is highly portable, easy to use, compact, efficient, and

How to insert special characters in Oracle: & amp; and '(Multiple Solutions)

How to insert special characters in Oracle: & and '(Multiple Solutions) When importing a batch of data to Oracle today, I encountered a problem: Toad prompts me to assign a value to a custom variable AMP. At first I was wondering that data is a

Oracle 11g uses DML Error Logging to avoid bulk insert failure

Oracle 11g uses DML Error Logging to avoid bulk insert failure Use DML Error Logging to avoid bulk insert failureIf an error occurs when an insert statement with a subquery is used to load data. the system terminates the statement and rolls back the

Oracle 8.1.7.4 database fault recovery solution instance

Oracle 8.1.7.4 database fault recovery solution instance The customer's database version is 8.1.7.4. the disk where the data file is located is faulty. After the fault is rectified, the data file needs to be recovered and set to online;ORA-00376:

Oracle 11.2.0.3.0 psu 11.2.0.3.9 in aix

Oracle 11.2.0.3.0 psu 11.2.0.3.9 in aix Upgrade Oracle psu to 11.2.0.3.9 on aix,Encountered: Copy failed from '/install/17540582/16902043/files/lib/libnnz11.so' to '/oraapp/oracle/product/11.2.0/dbhome_1/lib/libnnz11.so' Please verify all

MySQL performance profiling tool (pt-query-digest)

MySQL performance profiling tool (pt-query-digest) This tool is also from percona-toolkitOther tools in this tool setTroubleshooting of abnormal shutdown of MySQL Slave (pt-slave-restart) Verify MySQL master-slave consistency (pt-table-checksum & pt-

The Thinkphp framework supports MySQL read/write splitting.

The Thinkphp framework supports MySQL read/write splitting. In the past, I tried to use Mysql Proxy and Ameba to solve the read/write splitting of MySQL, but the results are not very satisfactory. Now many websites and projects have been migrated

Create index hang (row cache lock) for the partition table in the RAC Environment)

Create index hang (row cache lock) for the partition table in the RAC Environment) Create a bitmap index on a large table (Partition Table) today. After a period of execution, hang will wait for the event to be row cache lock. Query: SQL> Select

Oracle tablespace growth exception solution: Another example

Oracle tablespace growth exception solution: Another example Description: The temporary tablespace of a database in the customer environment increases abnormally (with a random date). It may be caused by the scheduled jobs of the following two

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