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We all know that temporary Oracle tables can improve the processing performance of Oracle databases. If we do not need to store temporary Oracle tables, they can only be stored in the actual application space of temporary Oracle tables. I hope it

This article mainly introduces the experience of using temporary Oracle tables. Currently, we use Oracle as a database support platform, it can be said that the data volume is still a relatively large system, that is, the table data volume is

Create a temporary table: Create an Oracle temporary table. There are two types of temporary tables: 1. Session-level temporary table 2. Transaction-level temporary tables 1) SESSION-level temporary table because the data in this temporary table is

Today we are going to discuss with you the practical operation skills for DB2 database to lock a single session. Starting from version 8.2, DB2 users can specify relevant locking policies for each DB2 session. In earlier versions, you can only

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Library cacheHandle stores the lock and pin information. In addition, both the Library cache handle and child cursor have lock and pin. These are called library cache lock and library cache pin. Library cachelock/pin is used to control concurrent

Oracle undo complexity-oracle Core Technology Reading Notes 4, undo-oracle I. Overview Undo stores old data. For example, if you modify A record to change abc of column A to def, abc is saved in undo. There are two purposes: 1. if your transaction

PL/SQL cursor usage, plsql cursor usageZookeeper Use of cursors ① Cursor ConceptTo process SQL statements, ORACLE must allocate a region called context area to process required information,This includes the number of rows to be processed, a pointer

SQL Server lock queuing mechanism, SQL Server queuing mechanism 1. Create a new table and insert 1010000 data: create table test(id int identity(1,1) ,name varchar(600)) goinsert into testvalues(replicate('a',600));go 1010000create index

Currently, all applications that use ORACLE as the database support platform have a large amount of data, that is, the data volume of tables is generally more than one million data volume. Of course, creating partitions in Oracle is a good choice,

The view v $ session_wait can be used to view the current wait events of the system and the information about the resources corresponding to the wait events, so as to determine the type of the bottleneck and its objects. The P1, P2, and P3 values of

Oracle logical read and physical read1. Physical reading is the process of reading data from the disk to buffer catch.Generally, if you find that the data does not exist in buffer catch when you need the data, that is, Oracle performs physical

PL/SQL cursor usage Use of cursors ① Cursor ConceptTo process SQL statements, Oracle must allocate a region called context area to process required information,This includes the number of rows to be processed, a pointer to the expression after the

InnoDB modifies the table object structure online Modify the table object structure online: Before MySQL5.6 1. Create a temporary table with the same structure as the original table object (invisible to users by implicit operations) and change the

Reading Notes db file scattered read DB, db file sequential read DB, free buffer waits, log buffer space, log file switch, log file sync The view v $ session_wait can be used to view the current wait events of the system and the information about

Temporaryqueue and temporarytopic, literally, can be seen as "temporary" destinations. Can be created by session, for example:Temporaryqueue replyqueue = Session.createtemporaryqueue ();Although they are created by the session, their lifetime is

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No index is created for certain fields in the query. In Oracle, if the table does not have an index, all data will be copied to the temporary tablespace. No index is created for certain fields in the query. In Oracle, if the table does not have an

Most browsers now have cookies and session functions, each time they enter a login name and password, or some kind of operation, there will be a cookie reminder, so you want to see the role and the difference between them, It is really a headache to

1. Cursor conceptLiterally, it refers to a swimming cursor, which is a handle or pointer pointing to the context area.When performing the CRUD operation in the PL/SQL block, ORACLE allocates a context zone for it in the memory. The database language