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: Copy Code code as follows: chmod +x backup.sh For Oracle users, enter the CRONTAB-E command to edit the task schedule for Oracle users: Code to copy the code as follows 1.[oracle@localhost backup]$ CRONTAB-E 2.42 * * */home/oracle/backup/backup.sh This adds a plan to run the/home/
This article describes Oracle's query optimizer, a key component of the database, which gives Oracle users excellent performance. Oracle's query optimization technology is unmatched in functionality, and this article discusses all the important areas of query optimization in detail. Brief introduction What is the query optimizer. Query optimization is critical to the performance of relational databases, esp
oracle| Security | strategy | data | database Oracle is a relational database management system, which has powerful function and excellent performance, and occupies an important position in today's large database management system
oracle| Recovery | data | database | Optimization The steps to minimize Oracle downtime are discussed here. All forms of downtime-planned or unplanned-always occur, and a DBA should have the right backup strategy so that it can recover more quickly if there is a problem with the da
The code is as follows Copy Code Set Trimspool onSet Linesize 120Set PageSize 2000Set NewPage 1Set Heading offSet term offSpool path + filenameSelect Col1| | ', ' | | col2| | ', ' | | col3| | ', ' | | col4| | '. ' FROM TableName;Spool off With some basic commands 1. Get database name and date createdSELECT name, created, Log_mode, open_mode from V$database; 2, the
The Oracle tutorial you are looking at is a number of ways to optimize the design of Oracle library tables. ObjectiveThe vast majority of Oracle database performance problems are caused by unreasonable database design, only a small number of problems rooted in db Buffer, Sha
oracle| Design | Optimization Preface The vast majority of Oracle database performance problems are caused by unreasonable database design, only a small number of problems rooted in db Buffer, Share Pool, Redo Log buffer and other memory module configuration unreasonable, I/O contention, DBA responsibilities, such as C
filesStartup Nomount;Set dbid = Restore Controlfile from Autobackup;ALTER DATABASE Mount;Restore database;Recover database Noredo;ALTER DATABASE open resetlogs;ALTER DATABASE open;In this example there is a dbid this can beSELECT * from V$
Label:First, why need data backupThe main reasons for data loss:1, media failure.2, the user's error operation.3, the server's complete collapse.4, computer viruses.5. Unforeseen factors.The fault types in Oracle are divided into the following 4 categories. 1. Statement failure:A logical failure to execute a SQL statement procedure can cause a statement failure. If a user writes an invalid SQL statement, a statement failure occurs.
Oracle Week Three: Table space management What does the name contain? : Improved table space management Table space management has been significantly improved, which can be attributed to a sparser SYSTEM, support for user-defined default tablespace, new Sysaux, and even renaming How many times have you been hurt by the user's creation of a non-SYS and system segment in the system table space? Before Oracle9i
(exclusive mode) flash back to a point in time, SCN or log sequence number use Resetlogs to open the database 1. Using Sqlplus for Flashback You can accept a time stamp or a system change number argument sqlplus several commonly used flashback database methods FLASHBACK [STANDBY] Database [V. SummaryThe flashback strategy
Tags: create creat man data Migration hive Shell problem: strong BMSQuestions:1. Does the logical backup contain a table structureThe answer contains the table structure2.Rman is a logical or physical backup, or is it a backup?The answer is physically prepared and belongs to the hot backup3. What is the way to hot backup?Answer: command backup under SQL or Rman backup4. What files can be backed up by a hot backup5. What is the role of online redo files?Answer: in the
version, Oracle's lower version of the export data file can be import into a higher version of the Oracle database, but the version of Oracle can only be contiguous and not cross-version.• Reorganization Table• Move data between different database users• Move data table space between different databases• Store the def
% ' (WHERE clause condition includes a series of values, Oracle will query LODGING_PK by index range query) 2) based on a non-uniqueness index search: SELECT Lodging from Lodging WHERE MANAGER = ' LI '; (This query is two-step: Lodging$manager's index range query gets all the rowid that match the criteria records, and then gets the value of the lodging column through the ROWID Access table.) The index is a non unique index, and the
referenced index in the WHERE clause will have the highest precedence. Example: There is a DEPTNO index on the Emp_cat, and a non-uniqueness index is also available SELECT ename from EMP WHERE dept_no = and Emp_cat = ' A '; The DEPTNO index is retrieved first and then merged with the results retrieved by the Emp_cat index, and the execution path is as follows: TABLE ACCESS by ROWID on EMP and _equal INDEX RANGE SCAN on Dept_idx INDEX RANGE SCAN on Cat_idx 19: Equation Comparison with ra
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