growth_increment value. If these log files grow to a large volume due to many small increments, they will have many virtual log files. This reduces the speed of database startup, log backup, and restoration operations.
Is there less virtual
Modify the size of Oracle redo log files
Modify the size of Oracle redo log files
1. Create 3 new log groups
SQL> ALTER DATABASE ADD LOGFILE GROUP 4 ('/u01/app/oracle/oradata/orcl/redo06.log') SIZE 500 M;
SQL> ALTER DATABASE ADD L
8.1 what is an archive log fileOracle databases allow you to store full redo log files to offline directories, which are called archive log files.Archive the process of saving the redo log file to the archive log file. This proces
Tail-f Test.logYou will see that the screen is constantly being printed out. This time interrupts the first process ctrl-c,How Linux displays a few lines of a file (in the middle of a few lines)Starting at line No. 3000, displays 1000 rows. The 3000~3999 line is displayedCat FileName | Tail-n +3000 | Head-n 1000Display 1000 rows to 3000 rowsCat filename| Head-n 3000 | Tail-n +1000* Note the order of the two methodsDecomposition:Tail-n 1000: Show last 1000 rowsTail-n + 1000: Starting from 1000 li
Summary of basic operation commands for Binary Log files in MySQL,
MySQL Binary Log, also known as bin-log, is a Binary Log file generated by mysql execution changes. It has two main functions:* Data reply* Master/Slave databases. It is used to add, delete, modify, and maint
time. Process Statistics-implemented by the system kernel. When a process stops, write a record for each process to the process Statistics file (pacct or acct. The policy of process statistics is to order application statistics for the fundamental work in the system. Fault diary-implemented by syslogd (8. Various system Guard processes, user measures and the kernel through syslog (3) to the file/var/log/messages claims worth noting the accident. Ther
Flume Introduction
Flume is a highly available, highly reliable, and distributed system for massive log collection, aggregation, and transmission provided by cloudera. Flume supports Custom Data senders in the log system, flume is used to collect data. Flume also provides the ability to process data and write data to various data receivers (customizable.
System Functions
as an ORACLE user or connect to the database server through a networkGo to ORACLE Data Backup ToolRman target/Or rman target/@ orclRunDelete archivelog all completed before 'sysdate-7 ';DescriptionSYSDATA-7, indicating the current system time 7 days ago, the before keyword indicates the archived log 7 days ago, and if the flash back function is used, the flash back data is also deleted.In the same way, you can delete all the logs from the past seven
/ldfsys/redo04_1.log '; ■ Delete the redo log file groupSQL> alter database drop logfile group 4; After a redo log file group or member is deleted from the database, the operating system files used by the member are not actually deleted from the disk,In other words, the control file of the relevant database is updated
How Linux uses commands to view a few lines of a log file (middle or last lines)How Linux displays a few lines of a file (in the middle of a few lines)"One" starts at line No. 3000 and displays 1000 rows. The 3000~3999 line is displayedCat FileName | Tail-n +3000 | Head-n 1000"Two" displays 1000 rows to 3000 rowsCat filename| Head-n 3000 | Tail-n +1000* Note the order of the two methodsDecomposition:Tail-n
Troubleshooting of default temporary tablespace and redo log files in Oracle
Problem: I want to synchronize Oracle Data to MySQL now. the ETL tool is used because the data volume is large and temporary tablespace is used for subqueries, resulting in the original temporary tablespace, insufficient space. Based on the error message, I directly thought of adding a temporary file to the temporary tablespace. I
Use logwatch to monitor log files in Linux
Linux operating systems and many applications create special files to record their running events. These files are often called "logs ". These system logs or specific application log files
single file based on each table, then set Innodb_file_per_table to ON, which will create a tablespace for each table, but even so, shared tablespaces are essential, Because the data dictionary needs to be put inside, it's just not going to take up so much space.
The following figure shows how InnoDB is stored:
The following storage files are mainly available in the above illustration:
1 table structure definition file (. frm): MySQL each table,
fundamental work in the system. Fault diary-implemented by syslogd (8. Various System Guard processes, user measures and the kernel through syslog (3) to the file/var/log/messages claims worth noting the accident. There are many other UNIX methods to create a diary. Such as HTTP and FTP provide network work tools also maintain a specific diary. The commonly used log
The Oracle OEM manager displays visualized logs. After we manually clear the files in the archive directory, these records are not cleared from the controlfile, that is, oracle does not know that these files no longer exist! In this case, if we want to manually clear it, we can try this method after experiment:
1. Enter rman2. connect target/3. crosscheck archivelog all;4. delete expired archivelog all;At t
Overview
The concept of a log file is well understood, which is what time, who, where, and what has been done. A program called Syslog (an extended rsyslog for Ubuntu) is responsible for collecting the information generated by the system, and then writing them to specific places according to the rules, including files, consoles, printers, remote hosts, and so on. Because the
Native to Ubuntu system, Local System character encoding is:Echo $LANGZh_cn. UTF-8The character encoding for the remote server (121.199.42.27) is:Zh_cn. GB18030After logging on to the server via SSH, check the Catalina.out log in Tomcat and find that Chinese is garbled.The following are the solutions:
VI catalina.out: Set Termencoding=utf-8
Tail,more and other viewing files garbled way to solve
Use the dwarfdump command and the dsym file to link binary image to view the crash log... first, you need to package the dsym file, and then enter the command in the terminal: 1 $ dwarfdump -- lookup = ADDRESS -- arch = ARCH {MyApp. app. dsym} 001NAME002 dwarfdump -- dump DWARF debug information.003 004SYNOPSIS005 dwarfdump [options] file1 file2... 006 007DESCRIPTION008 For each operand that names a mach-o
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