In the Oracle sessions management category, you will find numerous queries to identify useful information such as the USER, MACHINE, and PROGRAM of origin for a session. Additionally, it is possible to easily identify sessions that generate LOCK situations. Lastly, there are dynamic queries for creating the kill session command via the session’s SID and SERIAL.
An Oracle session is a logical entity that is generated when a login is made to the database. A single connection can have 0, 1, or more sessions established on it, thus generating multiple sessions.
When a table is the subject of DML operations, a LOCK occurs on the table. This prevents other operations from modifying the table. If other sessions need to write to the table that is the subject of DML operations, they are blocked until the operation that generated the LOCK is finished.
LOCKs can cause significant delays and sometimes to unlock the situation, it may be necessary to terminate the session that is keeping the table locked. Therefore, to unlock the LOCK situation, it is necessary to execute the KILL session command.
In the “Oracle SESSION Management” category, you will find numerous queries to identify useful information such as the USER, MACHINE, and PROGRAM of origin for a session. Additionally, it is possible to easily identify sessions that generate LOCK situations. Lastly, there are dynamic queries for creating the kill session command via the session’s SID and SERIAL.
With the article “Query Oracle sessions processes transactions cursors”, we have the possibility to identify the maximum number of sessions or processes or transactions or cursors, their usage and percentage. Several times I have been contacted by the monitoring group due to the increase in the number of sessions. If Read more…
In the article “Query Oracle LOCK and number of sessions” will be of great help. Especially when the application group is stuck due to database errors and the manager is bombarding you with questions just to make you waste more time. In highly accessed databases, it may happen that, among Read more…
In the article “Query Oracle sessions to date and time”, we can control Oracle sessions before a certain date or time using a specific query. Sometimes, it can be difficult to locate the oldest sessions in the database due to the high number of sessions. The article provides a solution Read more…
With the article “Query sessions holding LOCK,” we can identify the session that is blocking access to other sessions on the contested object. We have already discussed in previous articles about disputes in the Oracle database: Query LOCK and number of Oracle sessions and… The main cause of disputes within Read more…
With the article “Query to see the RMAN sessions”, we have the possibility to verify if the RMAN backup is running or not. In case potential backup issues are reported, we can check if the backup schedule time matches the access time of the RMAN sessions on the database. If Read more…
With the article “Oracle User Sessions Query”, we retrieve information about the LOGON, STATUS, SID, software, and machine of all Oracle sessions for a particular user. The first lines of the query concern the formatting of the columns and will help us have a better visualization of the output as Read more…
In the Oracle SID session query article talking about of Query to retrieve information about Oracle sessions having the session SID. This query is widely used by me when I have to analyze sessions that are creating problems, so if we have to identify, for example, a session that is Read more…
If you’re looking to perform “KILL Oracle user sessions,” you’re in the right place! During the deletion phase of a SCHEMA, it often happens that sessions connected to the database hinder the process, generating the classic error ORA-01940: cannot drop a user that is currently connected. This situation typically occurs Read more…
In the article KILL Oracle USER sessions on RAC is much loved by me because of its precious use, since through the INST_ID field, we are able to execute the KILL on each instance that makes up the Oracle RAC. In the numerous requests that arrive from the clients that Read more…
Query to Identify Sessions Blocked by Another Session Well, before diving into the article “Query to Identify Sessions Blocked by Another Session,” we’d like to introduce this website to you if you’re seeing it for the first time! Scriptdba is the first vertical website on Oracle databases completely in Italian. Read more…