following partitioning index:
Create INDEX big_hash_idx1 on big_table_hashed (owner)Global partition by range (owner)(Partition values less than (' F '),Partition values less than (' M '),Partition values less than (' T '),Partition values less than (MAXVALUE));
Run the above test script again, using the Tkprof tool for comparison, the results are as follows:
For a hash partition table:
SELECT *Frombig_ta
Bootstrap global CSS style table, bootstrap global css
. Table -- basic table style;
. Table-striped -- adds a zebra stripe pattern to each row in
. Table-bordered -- add a border for
DELETE ROWS specified.Session-level temporary tables are valid for the current session, specified by the statement: on COMMIT PRESERVE rows statement.Example of usage (in Scott mode):CREATE GLOBAL Temporary TABLE session_temp_tab on COMMIT PRESERVE ROWS as SELECT * from EMP WHERE 1=2;The on COMMIT PRESERVE rows statement specifies that the temporary table create
User Temp Table:CREATE TABLE #XX(ID int, idvalues int)System Temp Table:CREATE TABLE # #XX(ID int, idvalues int)Difference:The User temporary table is visible only to the session of the user who created the table, not to other processes.This temporary table is automatically
Temporary tables are divided into:Local temporary table, limited to the current visitor access, the creation method goes as follows:CREATE table #TableName (table structure)stored in database tempdb (hard disk), current user disconnects (put current), automatically deletedIf you are continuing to open a connection in use and do not need the temporary
Tags: MySQL database database administrator database development Beijing MySQLMySQL database business in some data similar to data dictionary, such as configuration file configuration, common business configuration or table with little change in data volume, these tables are often not particularly large, but most of the business scenario will be used, then this table is suitable for mycat
only use the global temp table to achieve our goal.
Well, as the situation is clear, we can write a simple stored procedure like the following:
CREATE PROCEDURE gp_findtemptable--2001/10/26 21:36 Zhuzhichao in Nanjing
/* Look for a global temporary table named with the operation employee number
* If not, place t
. When a transaction ends (commit or rollback), Oracle automatically clears the data in the temporary table.
The data in the temporary table is only valid for the current Session. Each Session has its own temporary data and cannot access the data in the temporary table of other sessions. Therefore, DML locks are not required for temporary tables.
The create
there is a problem with the SQL logic, but 10046 there is no trace to the execution plan, but read the logical reading, the slow one should have produced a Cartesian product. After a simple check, SQL logic does not have a problem, people's first feeling is not necessarily reliable.4. I was wondering what led to the implementation plan is not allowed, suddenly think of Rel_oid_classify is a global temporary table
KernelPage Global Directory (PGD)of User process createdIn earlier versions:When you fork a process, you must establish the process's own kernel page directory entry (the kernel page directory entry to the user spacePage directory is placed on a contiguous page of the same physical address, so it cannot be shared, but the kernel page table of all processesProcess 0 Sharing)3G user, a page directory in a map
Brief introduction
This series of articles is made up of two parts. This article (part 1th) describes how to create a global temporary table CGTT model for database DB2 for z/Os 10 (new feature mode) and DB2 for Linux, UNIX, and Windows 9.7, and how to use Infosphere Data A Rchitect V8.5 performs the following tasks.
Create a physical data model using CGTT for the DB2 for z/Os 10 (new feature mode) and DB
High_value------------------------- ------------------------- ------------------ ------------------------------ -----------P_andy P1 1 USERS 10P_andy P2 2 USERS 20P_andy P3 3 USERS 30P_andy P4 4 USERS 40--Inserting dataSql>BeginFor I in 1.. The LoopINSERT into P_andy values (i, ' andyi ');End Loop;CommitEnd/PL/SQL procedure successfully completed. 二、一次 truncate or drop multiple partitions (This shows that only the truncate,drop can be used to replace the keyword.)Mode one: Truncate without upd
Word scanning. (Executes the rest of the text, such as the print process above)4. Suspends macro execution when the SAS compiler receives a global SAS statement or when it encounters a SAS step Boundar Y.5. Resumes execution of macro language statements after the SAS code executes.macro Run process can deal with two parts , the first part of the symbol table, the second part of the input stack2: Debug macr
Partition Table, partition index, and global index:
When a table contains more than 20 million data records or occupies 2 GB of space, we recommend that you create a partition table.
Create Table TA (C1 int, C2 varchar2 (16), C3 varchar2 (64), C4 int constraint pk_
This article will mainly introduce some common global primary key generation strategies, and then highlight a very good global primary key generation scheme used by Flickr. For the split strategy and implementation details of the sub-list (sharding), refer to the previous article in the series: Database Library sub-table (sharding) series (i) Split implementation
A global temporary table is a temporary table prefixed with '##' and visible to all sessions. Global temporary tables are generally used to share data with everyone. The following is an example of a global temporary table.
--
Label:This article will mainly introduce some common global primary key generation strategies, and then highlight a very good global primary key generation scheme used by Flickr. For the split strategy and implementation details of the sub-list (sharding), refer to the previous article in the series: Database Library sub-table (sharding) series (i) Split implemen
table is an independent object for each connection, we can only use a global temporary table for our purpose.
Now, the situation is clear. We can write a simple stored procedure like the following:
Create procedure gp_findtemptable -- 2001/10/26 21:36 zhuzhichao in Nanjing
/* Search for a global temporary
ASP. URL rewriting and optimization (beginner)-Customizing URLs using the Global routing tableIntroduction---In today's search engine system bully world, we have to do something to please the crawler, and then prompted the site rankings to win a look at the past traffic.URL rewriting and optimization is one of the means of search engine optimization.If the URL of a mobile website (based on the ASP. NET MVC) category page is this,Http://www.xxx.com/cat
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