Is there a limit on how many records can go to a global temporary table, before it affects performance, and does it affect performance? I am talking here about millions of records that might be inserted to a global temporary table.
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Is there a limit on how many records can go to a global temporary table, before it affects performance, and does it affect performance? I am talking here about millions of records that might be inserted to a global temporary table.
there is no hard limit to the number of records in a global temporary table. Data will eventually be written to disk and therefore will be subject to read/write speed when you insert/update your data or query the table. You would expect performance (i.e data modification and data access) to be roughly of the same level as a regular table — a little faster since there is less redo generated.
You can add indexes to a global temporary table to ease retrieval of a subset of rows (it will obviously slow down insert and consume more temp space, this is a trade-off)