what is use of materialized view in oracle

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There is a 100-storey building that gives you two identical glass balls. If you start from a certain level, drop the glass ball and smash it. So how to use the hands of the two ball, what best strategy to know this critical layer is the first layer?

The title has a 100-storey building that gives you two identical glass balls. If you start from a certain level, drop the glass ball and smash it. So how to use the hands of the two balls, with what best strategy to know this critical layer is the first layer???Each time must be from the low floor to the high floor to try, until the floor f (k), the first ball ha

When landing with Sql*plus in Oracle, what is the user name and password?

The Sql*plus user name in Oracle is the system user, and the password is the password you set.If the password is forgotten, it can be reset by the following method.1, Win key +r key, enter cmd, open command prompt.2. Input Sqlplus/nolog3. Continue entering Conn/as SYSDBA4. Enter the ALTER user name identified by passwo

What is the difference between mandatory access to Oracle databases and DM?

can contain up to 10000 elements. Storage process for creating cells: The following is a reference clip: PROCEDURECREATE_COMPARTMENT( policy_nameINVARCHAR2, Oracle Database Policy Name comp_numININTEGER, Grid number short_nameINVARCHAR2, Short Name long_nameINVARCHAR2); Long Name C) group) A group is used to identify the org

What is the difference between the current mode read and the consistency reading of Oracle

COUNT (*) from T_test2 T1, t_test2 T2) > 0; 0 rows updated. 10:27:21 hellodba.com> Session 2: 10:26:16 hellodba.com>update t_test1 set secondary= ' B ' WHERE object_id =-1; 1 row updated. 10:26:41 hellodba.com>commit; Commit complete. 10:26:42 hellodba.com> See more highlights of this column: http://www.bianceng.cnhttp://www.bianceng.cn/database/Oracle/ If you observe carefully enough, you can see from the above 2 examples an interesting ph

About Oracle Database server Swap What is the recommended value for this setting

RAM2), when RAM is 2-16GB, swap size is recommended equal to RAM size3), Ram greater than 16GB, swap size recommended 16GB4, large memory environment swap size configuration recommendationsDue to the rapid decline in memory prices, the current production system server memory 256GB, 512GB is no surprise, the author recommends 16-64gb physical memory, swap and phy

What is the difference between Oracle's thin driver and OCI driver? Which one has better performance?

OCI: to install the Oracle client, the portability is slightly poor, and theoretically the performance is better Thin: belongs to type4, which is implemented in pure Java and has good portability. Theoretically, the performance is slightly lower. Recommendation: it

What table is the Oracle query field

--The query field in what tableSelect * from where t.column_name='ABC';--Query What table the field is in and determine if it is a primary keySelect * fromAll_tab_cols T Left Join ( SelectA.table_name, A.constraint_name, A.column_name, B.constraint_type--field Constraint type (P: primary key)

[Oracle] What should I do if undo is damaged without backup?

If undo damage is unfortunately encountered in Oracle running, the best way is to recover it completely. However, if there is no backup, you can use an unconventional method (using Oracle's hidden parameters ),If undo contains uncommitted transactions at this time, it will c

[Oracle] What should I do if undo is damaged without backup?

If undo damage is unfortunately encountered in Oracle running, the best way is to recover it completely. However, if there is no backup, you can use an unconventional method (using Oracle's hidden parameters ), if undo contains uncommitted transactions at this time, it will

What is the difference between varchar, VARCHAR2, nvarchar2 in Oracle?

If the character encoding of Oracle is GBK, then a Chinese character takes up two bytes, but if you use UTF-8, then a Chinese character occupies three bytes. The VARCHAR2 type is used in most cases to ensure better compatibility.GBK Character Set: VARCHAR2 (10) Can save 5 Chinese, can save 10 English. However, using th

What is the use rate of PF? How to reduce the use rate of PF

  What is the use rate of PF? Pf:page file, pagefile (virtual memory) PF Usage: value of the amount of space that virtual memory has already used   What is the reason for the high utilization rate of PF Although PF is called

What is the use of Lambda expressions? How to use it?

Lambda expressions are available in Python, C ++, and other languages. To put it simply, the lambda expressions mentioned in programming are usually used when a function is needed, but you don't want to bother naming a function, that is, an anonymous function. The relationship between this usage and the so-called Lambda algorithm (the Wikipedia link in the question description)

When Maven is having problems, you can use-X to view debug information

Today encountered a problem, to use MAVEN to run a simplest project, has been stuck in the following sentence for a long time, very depressed.Generating project in Batch modeThink of a variety of ways to solve the problem, this thought is a jar package download incomplete caused, wasted a long time.The following article was found at the end.Http://www.cnblogs.com/wardensky/p/4513372.htmlOriginally, you can

What is schema in Oracle?

Solution. You cannot create a new schema in an Oracle database. To create a schema, you can only create one user, but it is not used to create a schema). When creating a user, create a Schem with the same name as the user name and use it as the default shcema for the user. That is to say, the number of schemas

In oracle, what happens when a value in date time format is inserted into a field in varchar2 format ?, Oraclevarchar2

In oracle, what happens when a value in date time format is inserted into a field in varchar2 format ?, Oraclevarchar2 -- Create Table test1 Create table TEST1(ID VARCHAR2 (40) default sys_guid (),TDATE VARCHAR2 (200))Tablespace APP_TX_DATAPctfree 10Pctused 40Initrans 1Maxtrans 255Storage(Initial 64 KMinextents 1Maxextents unlimited); -- Insert date time format

What is hibernate lazy loading? When do you use lazy loading? Why should I use lazy loading?

,proxy, the default is lazy= "proxy".The specifics of what to look for depends on your needs, not which settings are the best.If you include a Head object in a student objectIf you are sure that you want to use the student object with the properties of the head object, then you set the load immediately, because the settings are loaded immediately then query stude

Ask me to use Snoopy to collect some information. The rule is correct, but only 40 pieces of information can be collected. what is the possible cause?

[Urgent] Could you tell me why I used the Snoopy class to collect some information. The rule is correct, but only 40 pieces of information can be collected? I can only collect 40 pieces of information with the Snoopy type, one page is 10 pieces of target information, and the first four pages can be collected, the fifth page won't work, but if you collect the fifth page separately, the same rule will work. i

If the oracle client is not installed, use plsql to connect to oracle and oracleplsql.

If the oracle client is not installed, use plsql to connect to oracle and oracleplsql.1.1. Download the Instant Client Official Website: Http://www.oracle.com/technetwork/cn/database/features/instant-client/index-092699-zhs.html Download the instantclient-basic Package and decompress it to the local device. In this tes

What is the use of LAMBDA expressions? How do I use it?

where you can do one thing, and it doesn't matter what name it's called. Lambda expressions can be used to do this.Further, the anonymous function is essentially a function, and what it abstracts out is a set of operations. What does that mean? AnalogyA = [1, 2, 3]And F = L

What should I do if garbled characters occur during Linux installation and use of Oracle?

In Linux, garbled characters often occur in Oracle. Chinese characters are garbled during installation and use. This is because some fonts are missing in Linux. You only need to install these fonts to solve this problem. In Linux, garbled characters often occur in Oracle. Chinese characters are garbled during installa

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