Dictionary is an abstract data type used to store data items that can be indexed by key. Basic operations include insertion, search, and deletion. It is a relatively broad concept and does not specify specific implementation, such as what data structure is used to store data items at the underlying layer. Therefore, as long as each data item stored is a pair (Key, value) and can be indexed to this item with key, such a data type can be called dictionary.
Both direct-address
SQL Server temporary tableYou can also create a temporary table. Temporary tables are similar to permanent tables, but temporary tables are stored in tempdb. They are automatically deleted when they are no longer used.There are two types of temporary tables: local and global, both of which have different names, visibil
Temporary tablesIn Oracle, a temporary table is "static," which, like a regular datasheet, needs to be created only once, and its structure is valid for the entire period from creation to deletion. In contrast to other types of tables, a temporary table allocates space for the user when the data is actually added to the table, and the allocated space is from the temporary table space. This avoids data contention storage space with persistent objects.T
Because temporary tables are used directly to create intermediate tables, the speed is not satisfactory. Therefore, the idea of creating a temporary table as a memory table exists. However, the difference between a memory table and a temporary table is not familiar with it. You need to find the information.Initially, the temporary table exists after it is created. When the connection is disconnected, the te
Some people on the Internet have provided the best optimization ideas: 1. first, extract the records that meet the conditions in the large table to generate a temporary table. 2. then, compare the small temporary table with another small table.
Some people on the Internet have provided the best optimization ideas: 1. first, extract the records that meet the conditions in the large table to generate a temporary table. 2. then, compare the small temporary table with another small table.
Some
From: http://www.cnblogs.com/songdavid/articles/2371077.html
Some interface tables used by EBS sort information AP interface tables: requests involved in ap_invoices_interfaceap_invoice_lines_interface: Import of open interfaces of the payable management system case: Import of shipping AP and fee export AP Po interface table: application: po_requisitions_interface_all request involved: Import Application pr
Some people on the Internet have provided the best optimization ideas:
1. Extract the records that meet the conditions in the large table to generate a temporary table.
2. Associate the small temporary table with another small table.
No matter whether the thinking is worth discussing, it is very worthy of recognition to regard the temporary table as a transfer station.
Temporary tables are essentially cache representations. Temporary
Explanation 1:
Fact tables are data tables combined by a certain field of analysis.The latitude table is a combination of analysis indicators in this field.
Interpretation 2:
To put it simply;A fact table is a transaction table.A dimension table is a basic table.Used to explain the specific content of the keyword latitude in a fact table.
Explanation 3:
Fact data tableThe central table in the data
Replicated tables in the primary database
Table name
Description
MSreplication_options
The table stores metadata that is used internally for replication. This table is stored in the master database.
Replicated tables in the msdb database
Table name
Description
Msagentparameterlist
The table contains repl
Tags: Oracle replication Table Replication temporary table replication viewCreate a table new_table and old_table table structure (no old_table Records)CREATE TABLE new_table as SELECT * from old_table where 1=0;Create a table new_table and old_table table structure (with Old_table Records)CREATE TABLE new_table as SELECT * from Old_table;Copy a table to another tableINSERT INTO new_table select * from Old_table;Create a view, delete a viewCreate or Replace view **_view as SELECT * from **table;
physical model of the Data Warehouse.2. Basic concepts of fact tables and dimension tablesSimply speaking, the dimension table is the angle (dimension) in which you observe the object, and the fact table is what you want to focus on.For example, to analyze the sales of products, you can choose to analyze by product category, or by time, such as the press. The analysis forms a dimension. This will have two dimensions: Product category and time.Here ar
Mysql basics: deleting databases and tables, rename a table ============== delete a DATABASE ================ drop database is used to cancel the table used in the DATABASE and cancel the DATABASE. Be careful when using this statement! To use drop database, you need to get the database drop permission. If exists is used to prevent errors when the database does not exist. You can also use drop schema.
////////// Delete the jack and tmp databases //////
This article mainly describes the DB2 materialized query table, and also introduces MQT, summary table (summary), and staging table. To better describe it, we use some practical examples to show how to create and use materialized query tables. The definition of a materialized query table (MQT) is based on the results of one query.
MQT can significantly improve query performance. This section describes MQT, summary table, and staging
MySQL transaction tables and non-transactional tablesWhen viewing the Max_binlog_stmt_cache_size parameter interpretation (Getting Started tutorial qkxue.net), there is such a word if nontransactional statements within a transaction require More than this many bytes of memory, the server generates an error.So, what is nontransactional statements?In http://dev.mysql.com/find the nontransactional keyword, the first one out is Rollback Failure for nontra
primary partitions only-if you want more partitions, you need to create the so-called "extended partitions" and create logical partitions in them.
The
full name of GPT is the globally Unique Identifier Partitiontable, which means the GUID partition tables, which are introduced to complement the UEFI bios, Given that the MBR's disk capacity and partition size are no longer enough to meet hardware development needs, GPT's primary task is t
Summary of SQL SERVER partition tables-Maintenance and Management of partition tables
After creating a partition table as required, you must manage and maintain the partition table. The main content is:
1. Use the Sliding Window Scenario solution to split partition tables and data moving intermediate tables.
2. Struct
Recently, we used hibernate to dynamically generate tables in the project. When we set hbm2ddl. auto to update, we found that hibernate did not generate the corresponding data table information according to the default generation rules. However, it is strange that some tables are not generated, and other tables are successfully generated. Restart the project and
Label:Mysqldump:got error:1556:you can ' t use the locks with log tables. When using LOCK TABLESI put some mysqldump statements in a batch command file (the legendary. sh file) executed, and when I put theseMysqldump statement separate from one execution, I found that there was no error, so I looked up some information on the Web:Discovery is the logs table in the MySQL default database and cannot be caused by locking (lock
This article collects in my notebook, because cannot find the original source. Omitted in this, as if who knows can contact me plus.The core is to use the MySQL system table and the "optimize table name " command, the MySQL data table for the space release. Because both the Delete and drop table do not release the tablespace (thetruncate command frees the tablespace "delete all data"), it needs to be freed with the optimize command.The purpose of this stored procedure is to defragment all the
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