The best replacement for indexing is active management.

The best alternatives to indexing are rated as following:
★★★★★  active management
★★  hashing
★  partitioning
★  sorting
★  crawling
★  price indexing
★  manual indexing
  windows search
  wage indexing

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Speaking about indexing, one probably shouldn't forget about rotary table.

Other search terms related to indexing and their ratings are:
★★★★★ rotary table
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Google Trends

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indexing
active management
hashing