Availability of the table

I have table T_TRX with 10 million documents. This table contains three FK and its primary key is also mentioned in the other four paintings. I have an ETL process that fits between 10 k - 1 million records and updates about 5 k. T_TRX is a table that must be available 24/7 with 20 k selects being executed by day as well as the transactions of DML 5 k per day by end users. T_TRX is partitioned by STG_ID for improved performance of selection. Unfortunately, the STG_ID data are not related to ETL so cannot be used to swap partition for data charges.

The ETL process takes less than 25 minutes, and a merge statement performs the work. T_TRX is a very important table and must be in place 24/7. My concern is that if the ETL process has any type of failure or the session was killed and that the table is not accessible, I need a return for this. I thought that I could create a back up of T_TRX before the start of the ETL process, and if the ETL process fails for some reason, I could have a synonym point back to the top of table for end-users can always get and load the data.

The problem with this approach is that other than the ETL process, end users can also load data in this table. If the backup may be exceeded and data loaded by end-users lost if they don't have any kind of DML to the table after the back up has been taken. I can try to reinvent the wheel, but if the ETL process fails and / or the session load data ETL gets killed, how could this affect T_TRX to select and DML performed by end users?

Reads do not block the Scriptures.  Written do not block the readings.  The only "performance loss" I see would be for lack of IO.

I recommend you to read the Guide of Oracle Concepts to understand this basic concept.

At 3 o'clock, I suggest to use DBMS_PARALLEL_EXECUTE so that you can have several independent transactions that finished (IE COMMIT) within an acceptable time, limit the use of undo / archive log and can easily be retried after correcting what caused it to break.

MK

Tags: Database

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