temporal tables db2

Label:Temporal tables in OracleIn Oracle, a temporal table is "static", and it needs to be created one time, just like a normal data table, and its structure is valid from creation to deletion. In contrast to other types of tables, temporary tables allocate space only when the user actually adds data to the table, and

right-clicking the task of the database that you want to shrink the log file for corresponds to, shrink-file, as follows: Shrink log file Mode three (completely remove log files)Sometimes we don't need large log files at all, we need to completely remove the log files to free up hard disk space, we can achieve what we need with the following four steps. (1) Separating the database (2) Renaming log files (3) Reattach the database with no log files (4) Delete log file The demo is as follows: Summ

Update #tempSet #temp. Recycle=case when uniona.num>0 then 1 else 0 endFrom (select Gradeid,sum (num) as num from Areaallotwhere CHARINDEX (@Area, Areaallot.area) =1 and LEN (@Area) =len (area)-2Group by Gradeid) Uniona INNER JOIN #tempOn uniona.gradeid= #temp. Gradeid1, for this charindex today tangled a very long time to figure out how to make clear is how a meaning. In order to forget later, so probably make a note.CHARINDEX (@Area, Areaallot.area) =1 also is the starting position of @area in

IDENTITY_INSERT statements Truncate table Not allowed Allow Destruction mode Automatic destruction after batch finishes Explicitly call the DROP TABLE statement. Current session End auto-destructor (Global temp table: Also included when other conversational sentences are not in the reference table.) Transaction Only have a transaction when the table is updated, the duration is shorter than the temporary table Normal transac

similar to modifying the mechanism, that is, the main table deletes the row records, but the history table retains a deleted action.A simple test can be done here. Here are a few more test instructions1 If you use merge, then the merge operation will correspond to the above increment/delete/change to maintain the version2 After you have used a version-maintained table, you cannot use the TRUNCATE TABLE operation because the operation does not support3 drop TABLE, you cannot use the drop

Tags: User One users MIT action system meaning commit tool definitionDB2 supports session temp table. The table can only exist in a session or in a transaction context and is not visible to other users. DB2 V8 adds support for indexing of temporary tables, which is useful for increasing query speed.The following example illustrates the use of the session temp table:1. Before creating a session temp table, y

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,

Hello, everyone, today I met a federated query of two tables between two databases in DB2I know there are dblink in Oracle, but I don't know what to do with the two database federated queries of DB2.I looked for something similar toFor example, two databases: DB1,DB2User namePasswordSELECT * from DB1. User name. password, DB2. Username. password where db1. Nm=

Label:Hello, everyone, today I met a federated query of two tables between two databases in DB2 I know there are dblink in Oracle, but I don't know what to do with the two database federated queries of DB2.I looked for something similar toFor example, two databases: DB1,DB2User namePasswordSELECT * from DB1. User name. password,

may need to track the changes to the data source table. In this case, you need to use this CD table. DB2 official documentation defines CD tables as follows: each user table registered for the capture and replication of changes on the DB2 database server has a corresponding change data table. Simply put, this CD table is also called a change data table. It is us

Recently, due to project requirements, shell programs are used to batch Delete business table data, but business history data needs to be retained according to business needs. Because db2 is used in the project, db2 will generate a large number of logs when deleting data. It will fill up the log file and report the error 57011. by searching for some information on the Internet, the parameters are dynamicall