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I have experimented a lot with ChatterBot as you will see
form the database list
---------- TERMINAL ---------- /Desktop$ mongo MongoDB shell version v3.6.8 connecting to: mongodb://127.0.0.1:27017 Implicit session: session { "id" : UUID("38ce6b49-e6bc-47b1-8632-f64148a12c31") } MongoDB server version: 3.6.8 > show databases 16000000-chatbot 0.136GB 160000test-json 0.134GB GIGANTIC-bc-json 0.125GB admin 0.000GB chatterbot-database 0.021GB chatterbot2-database 0.012GB chatterbot3-database 0.019GB config 0.000GB local 0.000GB mydatabase 0.000GB new-super-chatbot 0.125GB newtrain-chatbot 0.136GB newtrain2-chatbot 0.000GB super-chatbot 0.171GB > use chatterbot-database switched to db chatterbot-database ------------------------------------------------------------------ > show collections statements ------------------------------------------------------------------ > db.statements.stats() { "ns" : "chatterbot-database.statements", "size" : 53577859, "count" : 215462, "avgObjSize" : 248, "storageSize" : 16666624, "capped" : false, "wiredTiger" : { "metadata" : { "formatVersion" : 1 }, "creationString" : "access_pattern_hint=none,allocation_size=4KB,app_metadata=(formatVersion=1),assert=(commit_timestamp=none,read_timestamp=none),block_allocation=best,block_compressor=snappy,cache_resident=false,checksum=on,colgroups=,collator=,columns=,dictionary=0,encryption=(keyid=,name=),exclusive=false,extractor=,format=btree,huffman_key=,huffman_value=,ignore_in_memory_cache_size=false,immutable=false,internal_item_max=0,internal_key_max=0,internal_key_truncate=true,internal_page_max=4KB,key_format=q,key_gap=10,leaf_item_max=0,leaf_key_max=0,leaf_page_max=32KB,leaf_value_max=64MB,log=(enabled=true),lsm=(auto_throttle=true,bloom=true,bloom_bit_count=16,bloom_config=,bloom_hash_count=8,bloom_oldest=false,chunk_count_limit=0,chunk_max=5GB,chunk_size=10MB,merge_custom=(prefix=,start_generation=0,suffix=),merge_max=15,merge_min=0),memory_page_max=10m,os_cache_dirty_max=0,os_cache_max=0,prefix_compression=false,prefix_compression_min=4,source=,split_deepen_min_child=0,split_deepen_per_child=0,split_pct=90,type=file,value_format=u", "type" : "file", "uri" : "statistics:table:collection-2-4978197057396752734", "LSM" : { "bloom filter false positives" : 0, "bloom filter hits" : 0, "bloom filter misses" : 0, "bloom filter pages evicted from cache" : 0, "bloom filter pages read into cache" : 0, "bloom filters in the LSM tree" : 0, "chunks in the LSM tree" : 0, "highest merge generation in the LSM tree" : 0, "queries that could have benefited from a Bloom filter that did not exist" : 0, "sleep for LSM checkpoint throttle" : 0, "sleep for LSM merge throttle" : 0, "total size of bloom filters" : 0 }, "block-manager" : { "allocations requiring file extension" : 0, "blocks allocated" : 0, "blocks freed" : 0, "checkpoint size" : 16617472, "file allocation unit size" : 4096, "file bytes available for reuse" : 32768, "file magic number" : 120897, "file major version number" : 1, "file size in bytes" : 16666624, "minor version number" : 0 }, "btree" : { "btree checkpoint generation" : 168, "column-store fixed-size leaf pages" : 0, "column-store internal pages" : 0, "column-store variable-size RLE encoded values" : 0, "column-store variable-size deleted values" : 0, "column-store variable-size leaf pages" : 0, "fixed-record size" : 0, "maximum internal page key size" : 368, "maximum internal page size" : 4096, "maximum leaf page key size" : 2867, "maximum leaf page size" : 32768, "maximum leaf page value size" : 67108864, "maximum tree depth" : 4, "number of key/value pairs" : 0, "overflow pages" : 0, "pages rewritten by compaction" : 0, "row-store internal pages" : 0, "row-store leaf pages" : 0 }, "cache" : { "bytes currently in the cache" : 61916859, "bytes read into cache" : 55325689, "bytes written from cache" : 0, "checkpoint blocked page eviction" : 0, "data source pages selected for eviction unable to be evicted" : 0, "eviction walk passes of a file" : 0, "eviction walk target pages histogram - 0-9" : 0, "eviction walk target pages histogram - 10-31" : 0, "eviction walk target pages histogram - 128 and higher" : 0, "eviction walk target pages histogram - 32-63" : 0, "eviction walk target pages histogram - 64-128" : 0, "eviction walks abandoned" : 0, "eviction walks gave up because they restarted their walk twice" : 0, "eviction walks gave up because they saw too many pages and found no candidates" : 0, "eviction walks gave up because they saw too many pages and found too few candidates" : 0, "eviction walks reached end of tree" : 0, "eviction walks started from root of tree" : 0, "eviction walks started from saved location in tree" : 0, "hazard pointer blocked page eviction" : 0, "in-memory page passed criteria to be split" : 0, "in-memory page splits" : 0, "internal pages evicted" : 0, "internal pages split during eviction" : 0, "leaf pages split during eviction" : 0, "modified pages evicted" : 0, "overflow pages read into cache" : 0, "page split during eviction deepened the tree" : 0, "page written requiring lookaside records" : 0, "pages read into cache" : 1951, "pages read into cache after truncate" : 0, "pages read into cache after truncate in prepare state" : 0, "pages read into cache requiring lookaside entries" : 0, "pages requested from the cache" : 124214, "pages seen by eviction walk" : 0, "pages written from cache" : 0, "pages written requiring in-memory restoration" : 0, "tracked dirty bytes in the cache" : 0, "unmodified pages evicted" : 0 }, "cache_walk" : { "Average difference between current eviction generation when the page was last considered" : 0, "Average on-disk page image size seen" : 0, "Average time in cache for pages that have been visited by the eviction server" : 0, "Average time in cache for pages that have not been visited by the eviction server" : 0, "Clean pages currently in cache" : 0, "Current eviction generation" : 0, "Dirty pages currently in cache" : 0, "Entries in the root page" : 0, "Internal pages currently in cache" : 0, "Leaf pages currently in cache" : 0, "Maximum difference between current eviction generation when the page was last considered" : 0, "Maximum page size seen" : 0, "Minimum on-disk page image size seen" : 0, "Number of pages never visited by eviction server" : 0, "On-disk page image sizes smaller than a single allocation unit" : 0, "Pages created in memory and never written" : 0, "Pages currently queued for eviction" : 0, "Pages that could not be queued for eviction" : 0, "Refs skipped during cache traversal" : 0, "Size of the root page" : 0, "Total number of pages currently in cache" : 0 }, "compression" : { "compressed pages read" : 1941, "compressed pages written" : 0, "page written failed to compress" : 0, "page written was too small to compress" : 0, "raw compression call failed, additional data available" : 0, "raw compression call failed, no additional data available" : 0, "raw compression call succeeded" : 0 }, "cursor" : { "bulk-loaded cursor-insert calls" : 0, "create calls" : 4, "cursor-insert key and value bytes inserted" : 0, "cursor-remove key bytes removed" : 0, "cursor-update value bytes updated" : 0, "cursors cached on close" : 0, "cursors reused from cache" : 0, "insert calls" : 0, "modify calls" : 0, "next calls" : 4997399, "prev calls" : 1, "remove calls" : 0, "reserve calls" : 0, "reset calls" : 39365, "restarted searches" : 0, "search calls" : 0, "search near calls" : 39338, "truncate calls" : 0, "update calls" : 0 }, "reconciliation" : { "dictionary matches" : 0, "fast-path pages deleted" : 0, "internal page key bytes discarded using suffix compression" : 0, "internal page multi-block writes" : 0, "internal-page overflow keys" : 0, "leaf page key bytes discarded using prefix compression" : 0, "leaf page multi-block writes" : 0, "leaf-page overflow keys" : 0, "maximum blocks required for a page" : 0, "overflow values written" : 0, "page checksum matches" : 0, "page reconciliation calls" : 0, "page reconciliation calls for eviction" : 0, "pages deleted" : 0 }, "session" : { "cached cursor count" : 0, "object compaction" : 0, "open cursor count" : 4 }, "transaction" : { "update conflicts" : 0 } }, "nindexes" : 2, "totalIndexSize" : 6389760, "indexSizes" : { "_id_" : 2002944, "text_new" : 4386816 }, "ok" : 1 } ------------------------------------------------------------------ > db.statements.totalSize() 23056384 ------------------------------------------------------------------ > db.statements.getIndexes() [ { "v" : 2, "key" : { "_id" : 1 }, "name" : "_id_", "ns" : "chatterbot-database.statements" }, { "v" : 2, "key" : { "_fts" : "text", "_ftsx" : 1 }, "name" : "text_new", "ns" : "chatterbot-database.statements", "background" : false, "weights" : { "text" : 1 }, "default_language" : "english", "language_override" : "language", "textIndexVersion" : 3 } ] ------------------------------------------------------------------ > db.statements.getIndexKeys() [ { "_id" : 1 }, { "_fts" : "text", "_ftsx" : 1 } ] ------------------------------------------------------------------ chatterbot-database> db.statements.distinct("in_response_to") ....... ........ 'Well, here I am.', 'Well, now, who did you think it was, your gentleman friend?', 'Kippers.', "'Wonder what she's got for tea. ' I said,", "'I bet its haddock, but I hope not. '", 'Well, all right, then.', "Now, that's a blessing.", ... 42204 more items ] chatterbot-database> ------------------------------------------------------------------ chatterbot-database> db.statements.distinct("text ......... ......... Well, here I am.', 'Well, now, who did you think it was, your gentleman friend?', 'Kippers.', "'Wonder what she's got for tea. ' I said,", "'I bet its haddock, but I hope not. '", 'Well, all right, then.', "Now, that's a blessing.", ... 42204 more items ] chatterbot-database> ------------------------------------------------------------------ >dbStats collStats <