meta: limit the number when scanning sessions/files

[SandyXSD]

No description provided.

[codecov-commenter]

Codecov Report

Merging #1397 (99dd4c2) into main (01d32d0) will decrease coverage by 0.06%.
The diff coverage is 60.71%.

@@            Coverage Diff             @@
##             main    #1397      +/-   ##
==========================================
- Coverage   59.59%   59.53%   -0.07%     
==========================================
  Files         128      128              
  Lines       21722    21739      +17     
==========================================
- Hits        12946    12942       -4     
- Misses       7238     7254      +16     
- Partials     1538     1543       +5     

Impacted Files	Coverage Δ
pkg/meta/tkv_mem.go	87.50% <12.50%> (-3.63%)	⬇️
pkg/meta/tkv_badger.go	72.18% <16.66%> (-2.21%)	⬇️
pkg/meta/tkv_tikv.go	62.58% <44.44%> (-2.34%)	⬇️
pkg/meta/redis.go	71.17% <50.00%> (+0.22%)	⬆️
pkg/meta/tkv.go	75.27% <85.71%> (ø)
pkg/meta/base.go	73.31% <100.00%> (ø)
pkg/meta/sql.go	67.73% <100.00%> (-0.57%)	⬇️
pkg/meta/tkv_prefix.go	96.49% <100.00%> (ø)
pkg/meta/sql_lock.go	72.84% <0.00%> (-2.65%)	⬇️
... and 2 more

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