decisions. setting thestatistics_level parameter tobasic disables The collection of many of the important statistics required by Oracle Database features and Fu Nctionality, including:
Automatic Workload Repository (AWR) snapshots
Automatic Database Diagnostic Monitor (ADDM)
All server-generated Alerts
Automatic SGA Memory Management
Automatic Optimizer Statistics Collection
Object Level Statistics
end to End Application tracing (v$client_stats )
Database Time Distributi
independently of any backup of the current control file explicitly request Ed as part of your backup command. If you enable control file Autobackups, then RMAN automatically backs up the control file and the current server parameter FileSql*loaderhttp://bbs.cqsztech.com/forum.php?mod=viewthreadtid=521In the following case, even if the parameter undo_retention specifies a value, it may be ignored?For Fixed-size undo tablespaces, the system automatically tunes for the best possible undo retention
Tags: Oracle 11g installation Diagram Oracle database tutorial Oracle installation Oracle Video tutorial Oracle Tutorial1. After completing this chapter, the Oracle Video tutorial will be able to master the following:650) this.width=650; "src=" Http://s3.51cto.com/wyfs02/M01/6C/F9/wKiom1VYlzGBc2q8AAGwuGI81FQ479.jpg "title=" 05- High.jpg "alt=" wkiom1vylzgbc2q8aagwugi81fq479.jpg "/> use Oracle Enterprise Manager to access the database using the Sql*plus tool command How to set the environmen
. 4.2 k, 4 k, etc. store non-standard data blocks here. As for what is a standard data block, I can only talk about it later. 2. redo log bufferredo log buffer stores the redo data generated by the database. What is redo data. Redo log buffer is written to the disk in the form of circular writing. Where is the disk? Do we also have three types of Disk Files? Redo01, redo02, and redo03. 3. The shared pool is used to store sql1.library cache: It stores SQL and pl/SQL packages and a lot of importan
/technetwork/java/javase/downloads/index.htmlExercise 2-2 to confirm available hardware resourcesIn this exercise, you'll review what resources are available for Windows and Linux.Windows:1. Right click on "My Computer" to open the Properties view RAM capacity, Ram at least 512MB, the preferred capacity is more than 1GB (the current machine has hit more than 4GB, no problem)2. Open the Advanced tab, and then, in the performance Settings-Performance Op
Java tutorial translation Sequence Java Introduction Build a JSE development environment-install JDK and eclipse Language basics Java Hello World Program Analysis Variable Java Variables Java Native type Conversion of Java
61. YoufrequentlyhavemultipleRMANsessionsrunning, starting $ SESSION. WhatRMANcommandcanyouruntosetthevalueforthiscolumn?
61. you frequently have multiple RMAN sessions running, and you want to be able to easily identify each job via the CLIENTJNFO
Segment segment, partition extent, block logical conceptTable. A-> heap, heap table, relatively slow (records in the heap table are not ordered)
Each block has an SCN header and some data is written at the end. (If the block breaks down, the entire
TCL: transaction control language, such as commit and rollback
PLSQL: Provides object-oriented support. You can call C to manipulate the hardware.
When called, PLSQL is put into the library cache in the share pool.PLSQL StructurePackagePackage body
Reclaim tables and IndexesResumable: if there is not enough space, it will be suspended for dBA for 2 hours, rather than directly reporting an error and exiting normally.If you can proceed, it will be suspended.
Space management and local zone
1. optimizer statistics
For performance, the selection of execution plans is very important. The standard practice is to use the optimizer to select an execution plan. The optimizer relies closely on Statistics to evaluate the efficiency of a number
Make sure that the directory where the installation file is located does not contain Chinese characters, otherwise there will be various problems! Since it is a learning and testing environment, these two items are free. Next, ignore. Of course, we
685. In your test database:
-You are using Recovery Manager (RMAN) to perform incremental backups of your test database
-The test database is running in NOARCHIVELOG mode
-One of the data files is already upted
-All online redo log files are lost
50. SLS is a private synonym for the SH. SALES table.The user SH issues the following command:Drop synonym sls;Which statement is true regarding the above SQL statement?A. Only the synonym wocould be dropped.B. The synonym wocould be dropped and the
I. queue and shared resourcesShared resources can be accessed by multiple sessions and processes at the same time. Therefore, its access needs to be protected. In Oracle, everything except PGA includes memory, disk, CPU, table, index, and
22. You need to create a table for a banking application. One of the columns in the table has the following requirements:1) You want a column in the table to store the duration of the credit period.2) The data in the column shoshould be stored in a
8. View the Exhibit and examine the structure of the MERs table.Which two tasks wowould require subqueries or joins to be executed in a single statement? (Choose two .)
(Question: A MERs table is provided for the question, asking which two tasks
7. Which two statements are true regarding the USING and ON clses in table joins? (Choose two .)
A. Both USING and ON clses can be used for equijoins and nonequijoins.
B. A maximum of one pair of columns can be joined between two tables using the ON
9. Which statement is true regarding the INTERSECT operator?
A. It ignores NULL values.
B. Reversing the order of the intersected tables alters the result.
C. The names of columns in all SELECT statements must be identical.
D. The number of
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