# Implementing SDR long term memory?

**URL:** <https://discourse.numenta.org/t/implementing-sdr-long-term-memory/8274>\
**Category:** Implementations\
**Tags:** memory\
**Created:** [February 26, 2021, 6:12pm UTC](https://discourse.numenta.org/t/implementing-sdr-long-term-memory/8274 "2021-02-26T18:12:47Z")\
**Posts on this page:** 1\
**Showing post:** 8

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**Author:** ![cezar\_t](https://yyz2.discourse-cdn.com/flex030/user_avatar/discourse.numenta.org/cezar_t/32/4451_2.png) [@cezar\_t](https://discourse.numenta.org/u/cezar_t)\
**Post date:** [February 7, 2022, 4:12pm UTC](https://discourse.numenta.org/t/implementing-sdr-long-term-memory/8274/8 "2022-02-07T16:12:49Z")

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Hi, I think the SDR indexer I mentioned in [this topic](https://discourse.numenta.org/t/a-sdr-associative-reverse-indexer/9426) addresses your 1…3 points.  
It also should “resolve” unions - searching for 2-3 SDRs overlapped should retrieve all (or most) of them.

I don’t understand your 4th point, “OPS” means… what?

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