The transaction log The transaction log is a separate file from the database file. It stores all changes to the database. Inserts, updates, deletes, commits, rollbacks, and database schema changes are all logged. The transaction log is also called the forward log or the redo log. The transaction log is a key component of backup and recovery, and is also essential for data synchronization using MobiLink or for data replication using SQL Remote.
By default, all databases use transaction logs. Using a transaction log is optional, but you should always use a transaction log unless you have a specific reason not to. Running a database with a transaction log provides greater protection against failure, better performance, and the ability to replicate data. It is recommended that you store the database files and the transaction log on separate disks on the computer. If the dbspace(s) and the transaction log are on the same disk, and a disk failure occurs, everything is lost. However, if the database and transaction log are stored on different disks, then most, if not all, the data can be recovered in the event of a disk failure because you have the full database or the transaction log (from which the database can be recovered). The timestamp of a database or transaction log file is updated only when the file grows or when it is closed.
If database operations cause the transaction log file to grow without the database file growing, the timestamp of the transaction log file is more recent than the timestamp of the database file. If the database is shut down, the transaction log file and the database timestamps are updated. Like the database file, the transaction log is organized into pages: fixed size areas of memory.
When a change is recorded in the transaction log, it is made to a page in memory. The change is forced to disk when the earlier of the following operations happens:. The page is full. A COMMIT is executed. Completed transactions are guaranteed to be stored on disk, while performance is improved by avoiding a write to the disk on every operation.
Configuration options are available to allow advanced users to tune the precise behavior of the transaction log.
Create and view LOG using SLG0 and SLG1 transaction Application LOG When we need to display all messages together then this set of messages is a log. Logs usually also contain general header information (log type, creator, creation time, etc.).
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Several logs can be created in a transaction. The Application Log provides a comprehensive infrastructure for collecting messages, saving them in the database and displaying them as logs. It has also traffic icons for the messages based on the message type. Important Transactions The important transactions codes used for application log are as following: SLG0 – Create a new Log Object and sub object SLG1 – Display Application Log SLG2 – Delete the Application Log Creation of object and sub object: For generating a custom application log we need to create a new log object and sub object. For this we use transaction SLG0. Go to transaction SLG0 and click on new entries. Then give the name of object and save.
For any of the object we can create the sub object as well. Sub objects are simply further classifications of the application log. To collect messages and display them in LOG in program: Function modules to be used: BALLOGCREATE Create log with header data BALLOGMSGADD Add a message to a log BALDBSAVE Save the messages BALDSPLOGDISPLAY Display message in memory Open Log The FM BALLOGCREATE is used to open application log. This FM returns log handle. This log handle is a unique identifier for a particular log.
We use this log handle later for accessing the log like for example adding messages to the log etc. Add message to LOG Using the log handle we can add as many messages we want to the LOG through the FM BALLOGMSGADD to the importing parameter ISMSG (structure BALSMSG). This data is very much similar to the T100 data that is message type, message number and the four message variables.
Save messages Logs there in the memory can be saved to database using the FM BALDBSAVE by passing the importing parameter ISAVEALL = ‘X’. The function module BALDBSAVE returns a table (Exporting parameter ENEWLOGNUMBERS), which relates LOGHANDLE, external number EXTNUMBER, temporary LOGNUMBER and permanent LOGNUMBER, so you can find out which number was assigned to a log after saving. Display messages FM BALDSPLOGDISPLAY is used to display collected messages. Background.
Below is one sample code using the above mentioned FMs: lslog-object = lcobject. “Object name lslog-aluser = sy-uname. “Username lslog-alprog = sy-repid. “Report name.Open Log CALL FUNCTION ‘BALLOGCREATE’ EXPORTING islog = lslog IMPORTING eloghandle = lsloghandle EXCEPTIONS logheaderinconsistent = 1 OTHERS = 2.
IF sy-subrc EQ 0.Create message lsmsg-msgty = lctype. “Message type lsmsg-msgid = lcmsgid. “Message id lsmsg-msgno = lcmsgno. “Message number lsmsg-msgv1 = lvmessage1.
“Text that you want to pass as message lsmsg-msgv2 = lvmessage2. Lsmsg-msgv3 = lvmessage3. Lsmsg-msgv4 = lvmessage4. Lsmsg-probclass = 2. CALL FUNCTION ‘BALLOGMSGADD’ EXPORTING iloghandle = lsloghandle ismsg = lsmsg. IMPORTING.
ESMSGHANDLE =. EMSGWASLOGGED =.
EMSGWASDISPLAYED = EXCEPTIONS lognotfound = 1 msginconsistent = 2 logisfull = 3 OTHERS = 4. IF sy-subrc NE 0. “Do nothing ENDIF. INSERT lsloghandle INTO TABLE liloghandle.Save message CALL FUNCTION ‘BALDBSAVE’ EXPORTING iclient = sy-mandt. IINUPDATETASK = ‘ ‘ isaveall = lcset itloghandle = liloghandle.
IMPORTING. ENEWLOGNUMBERS = EXCEPTIONS lognotfound = 1 savenotallowed = 2 numberingerror = 3 OTHERS = 4. IF sy-subrc EQ 0.
REFRESH: liloghandle. Usage of Application LOG We can use application log in the below scenarios: When we want to save the List/Log for the long time: Generally, we have the spool retention period of 8 days. So, the list or log will be deleted automatically.
When we want more information compared to Log generated with WRITE: Application Log has more information like User, date of creation, Severity of the message. In ALE / EDI Processing: When we do the cross client processing (IDoc Processing), we can generate the Application log to keep track of the generated errors or the messages. Summary of the steps to Create and View logs: 1) 1) Create object and sub object in SLG0 transaction. 2) 2) The program where you want to create the LOG call the FMs: BALLOGCREATE BALLOGMSGADD BALDBSAVE 3) 3) For viewing the logs go to SLG1 transaction and give the object name, sub object name (if any) and other related information like the Username and date etc. 4) Then click on Execute. You will be able to see the logs. Double click on any one of them to see the detailed error message.
4) One can even view the logs through the program itself by using the FM BALDSPLOGDISPLAY.
Online System Log Analysis - Application Log: Display Logs - Analysis of Security Audit Log - Asynchronous RFC Error Log - DBA Planning Calendar - Batch Input Monitoring - Logistics Queue Overview - Dia Log Box for Customizing - Convert Logical System Names - User List - Statistics display for all systems - Logical message types - Logon to SAP Service Marketplace - Maint.Assign. Logon Grp to Instance - Security Audit Configuration - Trust Manager for Logon Ticket - Maintaining Logical Systems - Log Analysis and Case Creation - Display Change Document Objects - Maintain cata Log - Users Logged On - DBA Backup Logs - Table History - RE: Display EXOP rent adj. Log - Client Copy Log - Logical Database Builder - Appraisal Template Cata Log - Incompletion Log - Application Log: Object Maintenance.
Sap Application Log Transaction Code
The transaction log The transaction log is a separate file from the database file. It stores all changes to the database. Inserts, updates, deletes, commits, rollbacks, and database schema changes are all logged. The transaction log is also called the forward log or the redo log. The transaction log is a key component of backup and recovery, and is also essential for data synchronization using MobiLink or for data replication using SQL Remote. By default, all databases use transaction logs. Using a transaction log is optional, but you should use a transaction log unless you have a specific reason not to.
Running a database with a transaction log provides greater protection against failure, better performance, and the ability to replicate data. It is recommended that you store the database files and the transaction log on separate disks on the computer. If the dbspace(s) and the transaction log are on the same disk, and a disk failure occurs, everything is lost.
However, if the database and transaction log are stored on different disks, then most, if not all, the data can be recovered in the event of a disk failure because you have the full database or the transaction log (from which the database can be recovered). The timestamp of a database or transaction log file is updated only when the file grows or when it is closed.
Sap Error Log Tcode
If database operations cause the transaction log file to grow without the database file growing, the timestamp of the transaction log file is more recent than the timestamp of the database file. If the database is shut down, the transaction log file and the database timestamps are updated. Like the database file, the transaction log is organized into pages: fixed size areas of memory. When a change is recorded in the transaction log, it is made to a page in memory. The change is forced to disk when the earlier of the following operations happens:. The page is full.
A COMMIT is executed. Completed transactions are guaranteed to be stored on disk, while performance is improved by avoiding a write to the disk on every operation. Configuration options are available to allow advanced users to tune the precise behavior of the transaction log.
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