in first row

I. Introduction of row migration and row link in actual work we often encounter some problems with low Oracle database performance. Of course, there are many reasons that cause low Oracle database performance, we can use some correct design and

12 people of different height, row in two rows, each row must be from short to high rank, and the second ranking corresponding to the first row of people high, ask how many kinds of arrangement? We can analyze the problem from the following

Scenario: If varchar and VarChar2 are modified more often, and the modified data length is different each time, this can cause a "row migration" phenomenonConcept:Row chaining and row migration (row migration)When a row of data is too long to be

In the actual work we often encounter some Oracle database performance is low, of course, the reasons for the low performance of Oracle database is various, we can through some correct design and diagnosis to try to avoid some Oracle database

Row chain: When a row is too large to fit into any block, row chaining occurs. in this case, the Oracle devide the row into smaller chunks. each Chunk is stored in a block along with the necessary poiters to retrive and assemble the entire row.

Transferred from: http://www.cnblogs.com/soroman/archive/2008/03/21/1115571.htmlThinking: Matrices and transformations, and the use of matrices in DirectX and OpenGL1. Matrix and Linear transformations: one by one correspondenceA matrix is a tool

Row migrations and row links lead to degraded Oracle performance, this article describes what row migration and row links are, what they do, how to judge them, and provides solutions to them.What is row migration and row link row migrationOracle's

Reprint Please specify: theviper http://www.cnblogs.com/TheViperPartially translated from How to select the First/least/max row per group in SQLSome common SQL problems have similar workarounds, such as finding the most recent logs for each program,

I. OverviewFor command switches There are many,/l,/f,/r. This is only for analysis of the for with/F, which is probably the most commonly used and strongest command, mainly used to process the output of files and some commands.1. Command format:(1).

Because of the row link can only increase db_block_size to clear, and db_block_size after the creation of the database can not be changed, so there is no more than the purge of the row link, mainly for the row migration to talk about in the actual