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Dictionary cache stores the definition, storage information, user permission information, constraint definition, rollback segment information, and table statistics of all tables.
Displays the percentage of memory read operations on data dictionaries and other objects.
Check Method:
Select (1-(sum (getmisses)/sum (gets) * 100 "hit ratio"
From v $ rowcache;
Eval
;select constraint_name, Constraint_type,search_condition, R_constraint_nameFrom user_constraints WHERE table_name = UPPER (' table_name ');Vi. stored procedures and functionsView the status of functions and stored proceduresSql>select object_name,status from user_objects where object_type= ' FUNCTION ';Sql>select object_name,status from user_objects where object_type= ' PROCEDURE ';View source code for functions and proceduresSql>select text from All_source where Owner=user and Name=upper (' pl
In the data dictionary you want to export data in the air right, new query, execute the following code can
Copy Code code as follows:
SELECT
(case when A.colorder=1 then D.name else "end) Table name, D.xtype as table type,
A.colorder field ordinal number,
A.n
psex
employee gender
varchar
4
page
employee age
int TD style= "VERTICAL-ALIGN:TOP;PADDING-RIGHT:5PX;PADDING-LEFT:5PX;" >
11
Paddress
Employee Address
varchar
50
The above is a simple data dictionary that describes the information about creating tables. below to start cr
person
There is an association table between the personnel and the Department, and the Department is a typical self-connection table. These three tables constitute a typical "one table in the many-to-many data model is self-join"
The following uses a person as an example to analyze the
Python's built-in dictionaries are implemented using hash table. Here we are just to deepen our understanding of hash table and hash functions by implementing our own hash table."Concept 1:mapping (map)"The dictionary is indexed by key. A key corresponds to a stored value. Any immutable
test simulation Export data from a table in a bad block of data files in an Oracle 11G databasePreviously thought that the dul corresponding version can only restore the highest database version consistent, today test found that Dul 10 can restore the latest version of the 11g database.Simulation EnvironmentSql> select * from V$version; BANNER--------------------
Locally vs. Dictionary Managed tablespacesorganized from :HTTP://WWW.ORAFAQ.COM/NODE/3.When Oracleallocates space to a segment (as a table or index), a group of contiguousfree blocks, called an extent, is ad Ded to the segment. Metadata regardingextent allocation and unallocated extents is either stored in the datadictionary, or in the tablespace itself. Tablespaces that record extentallocation in the
(: scn_save);
Pl/sql procedure successfully completed.
10:34:31 sql> SELECT * from T;
ID NAME
----------------------------------------------------------------------
1 LSF
2 LSF
3 LSF
4 LSF
5 LSF
6 LSF
6 rows selected.
In addition, the use of dbms_flashback. Before Enable_at_time, you have to set the exact level of your Nls_date_format, Oracle default is accurate to the day, if you do not set, like the above example you will not get the expected results
T_new EXCHANGE PARTITION P1 with table T;The table has changed.Sql> RENAME T to T_old;The table has been renamed.Sql> RENAME t_new to T;The table has been renamed.Sql> SELECT COUNT (*) from T;COUNT (*)----------6264Advantages: Only the definition of partitions and tables in the da
, the interface shows the table space name, table space type, district management type, to "trillion" as the unit of the size of the table space, the size of the table space used and table space utilization.
Fig. 1 Table space si
row in rows:
Print row
Copy Code code as follows:
Execution results:
(1L, ' Jack London ')
(2L, ' Honore de Balzac ')
(3L, ' Lion Feuchtwanger ')
(4L, ' Emile Zola ')
(5L, ' Truman Capote ')
Instance 4, using the dictionary cursor to get the result set (you can use the name of the table field to access the value)
Copy Code code as follows:
#-*-
should be in the table3. What data should be stored in the column family4. How many columns of data are stored in each column family5. What is the name of the column, because this information is required to operate the API6. What kind of information should be stored in a unit (cell)7. How many versions of information are stored in each cellThe most important thing in the design of HBase
designing a table in HBase:
1. How to set the structure of the row key, and what information to include in the row key (this is important, the following example will be explained)
2. How many column families should be in the table
3. What data should be stored in the column family
4. How many columns of data are store
temp;
# You can query the user information in the DBA_USERS view:
Selectusername, user_id, password, default_tablespace, temporary_tablespace
Fromdba_users
Whereusername = 'Felix'
# Grant the following permissions:
Grantconnect, resourceto felix;
Revokeunnlimited tablesapce from felix;
Alteruser felix quotaunlimitedon felix;
Ii. Table space management technology
(1) data
Here is a summary of the hash table after reading the introduction to the algorithm:Hash table is also called hash list, which is an effective data structure to implement dictionary operation. Hash tables are highly efficient and can be accessed once without a conflict (described later), and in an ideal case, the avera
replaced and then returned.If not found, the newly added value is placed in the new bucket, and when the free space is insufficient, the capacity is expanded (Resize) and then hashed to the target bucket. It is important to note that the resize operation consumes more resources.SummaryIn the previous articles, we introduced sequential lookups based on unordered lists, binary lookups based on ordered arrays, balanced search trees, and red-black trees, this article finally introduced the last kin
[ORACLE basics 2] I am not familiar with cross-server table data synchronization in oracle, but I am now scheduled to perform two database tables for Synchronous replication. I don't understand it. I can only start to study and create it. If you read my production process like me, it will be of great help to you. If you don't talk nonsense, you may not be able to remember the number of times. You can use ti
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