another session

In order to verify the restoration of ORACLE12CCDB database when redo is lost, a small experiment was conducted. Three sessions were operated to execute a delete statement in rootpdb without submitting the statement; the delete record of another

This article provides an excellent mechanism to define, encapsulate, and manage transactions. For more information, see This article provides an excellent mechanism to define, encapsulate, and manage transactions. For more information, see ACID:

Learning Dynamic Performance TableSixth article -(1)-v$session_wait 2007.5.30This is a critical view of looking for performance bottlenecks. It provides any case where the session is currently waiting in the database (if the session is currently not

Optimize Query speed for temporary Oracle tables 1. PrefaceCurrently, all applications that use ORACLE as the database support platform have a large amount of data, that is, the data volume of tables is generally more than one million data volume.

Q. How do I configure hibernate?A The configuration class uses the Config Hibernate.cfg.xml (or hibernate.properties) and the mapping file *. Hbm.xml to create (for example, configure and boot hibernate) Sessionfactory, and then sessionfactory

Before finishing an article: Oracle Wait Events Http://blog.csdn.net/tianlesoftware/archive/2010/05/31/5635934.aspx one. Knowledge of waiting events: 1.1 Wait events can be divided into two main categories, that is, idle (IDLE) Wait events and non

Recently often encountered MySQL database deadlock, depressed dead,Show Processlist; Waiting for table metadata lock can remain locked for a long time.Below is a section of the official website, can understand the nextHttp://dev.mysql.com/doc/refman/

Oracle WebsiteWhen a user issues a select: When the for update error is ready to be modified for the returned result set, blocking occurs if the result set has been locked by another session. You need to wait until another session finishes before

Acid:atomic, consistent, Isolated, durable The store program provides an excellent mechanism for defining, encapsulating, and managing transactions. 1,mysql Transaction Support 1 The MySQL transaction support is not tied to the MySQL server itself,

Last night on-line, but found a DDL statement has not been effective for a long timeCheck processlist, found numerous query hints including DDL statements "waiting for table metadata lock"The only query that does not have the hint is a full-table

In Unix-like systems, users typically deal with a variety of related processes. Although there is only one terminal process (the user's login shell , which launches various programs and services through the shell) at login time, many related

PLSQL_Oracle Temporary Table basic concepts and usage (concepts), plsql create Temporary Table 2014-06-08 BaoXinjian I. Basic Concepts 1. My Understanding of temporary tables: Create a table in Oracle. This table is not used for other functions. It

My understanding of temporary tables: Create a table in Oracle. This table is not used for any other functions, but mainly used for some special functions of the software system, when you run out, the data in the table is useless. After creating a

Reading Notes db file scattered read DB, db file sequential read DB, free buffer waits, log buffer space, log file switch, log file syncThe view v $ session_wait can be used to view the current wait events of the system and the information about the

When the execution of a query for a very long time, may encounter a ora-01555 error, this article to simulate and explain the reason. 013555 is because the query data in the execution of the query process When the execution of a query for a very

Copy a table to another table, view, and temporary table. create a new_table table with the same structure as an old_table table without the old_table record. create table new_table as select * from old_table where 1 = 0; create a table new_table

Next, let's take a look at what direct paths are and the advantages and restrictions of using direct paths. The article is taken from "Oracle? DatabaseAdministratorsGuide11gRelease2 (11.2) "(of course, the Chinese annotation is not in the official

Explain several usage and significance of Oracle temporary tables can be said to be a good way to improve database processing performance, when there is no need to store, only stored in the Oracle temporary tablespace. I hope this article will help

  The multi-version model of Oracle uses the UNDO data segment to reconstruct the block as is at the beginning of the statement or transaction (depending on the isolation mode. Rollback segments are used cyclically. After a transaction is committed,

Oracle dynamic performance view v $ event_name V $ EVENT_NAME view lists a set of waiting events. It provides information about sessions that must be processed:For official documents on www.2cto.com, see V $ EVENT_NAMEV $ EVENT_NAME displays