## Summary **No review yet** ## Minimized query ```sql .stats on CREATE TABLE T ( a TEXT, b REAL ); INSERT INTO T VALUES ('a',100.0), ('b',-200.5), ('c',9e999); CREATE TABLE t1(a INTEGER PRIMARY KEY, b TEXT, c INT, d INT); INSERT INTO t1 VALUES (1, 'Wernher', 10, 100); INSERT INTO t1 VALUES (2, 'von', 20, 200); INSERT INTO t1 VALUES (3, 'Braun', 30, 300); CREATE INDEX t1bc ON t1(b, c); PRAGMA writable_schema = ON; .imposter t1bc t2 SELECT * FROM t2; SELECT b, c FROM t1 ORDER BY b, c; .quit SELECT a,b, LEAD(b,1) OVER (ORDER BY b DESC) AS c, NTILE(2) OVER (ORDER BY b DESC) AS d FROM T; PRAGMA query_only; INSERT INTO T VALUES (1, NULL) ON CONFLICT(a) DO UPDATE SET a = excluded.a, b = excluded.b; SELECT COUNT(*) FROM t1; SELECT * FROM T; SELECT COUNT(*) FROM t1; ANALYZE; ALTER TABLE T RENAME TO T_r9134; ``` ## Actual output ```sql Memory Used: 78880 (max 80432) bytes Number of Outstanding Allocations: 162 (max 176) Number of Pcache Overflow Bytes: 16928 (max 16928) bytes Largest Allocation: 48000 bytes Largest Pcache Allocation: 4360 bytes Lookaside Slots Used: 32 (max 88) Successful lookaside attempts: 107 Lookaside failures due to size: 0 Lookaside failures due to OOM: 0 Pager Heap Usage: 13592 bytes Page cache hits: 4 Page cache misses: 0 Page cache writes: 0 Page cache spills: 0 Schema Heap Usage: 1008 bytes Statement Heap/Lookaside Usage: 2416 bytes Fullscan Steps: 0 Sort Operations: 0 Autoindex Inserts: 0 Virtual Machine Steps: 30 Reprepare operations: 0 Number of times run: 1 Memory used by prepared stmt: 2416 Bytes received by read(): 7336 Bytes sent to write(): 0 Read() system calls: 14 Write() system calls: 0 Bytes read from storage: 0 Bytes written to storage: 0 Cancelled write bytes: 0 Memory Used: 76488 (max 82168) bytes Number of Outstanding Allocations: 151 (max 176) Number of Pcache Overflow Bytes: 16928 (max 16928) bytes Largest Allocation: 48000 bytes Largest Pcache Allocation: 4360 bytes Lookaside Slots Used: 44 (max 88) Successful lookaside attempts: 141 Lookaside failures due to size: 0 Lookaside failures due to OOM: 0 Pager Heap Usage: 13592 bytes Page cache hits: 2 Page cache misses: 0 Page cache writes: 0 Page cache spills: 0 Schema Heap Usage: 1032 bytes Statement Heap/Lookaside Usage: 3680 bytes Fullscan Steps: 0 Sort Operations: 0 Autoindex Inserts: 0 Virtual Machine Steps: 32 Reprepare operations: 0 Number of times run: 1 Memory used by prepared stmt: 3680 Bytes received by read(): 7430 Bytes sent to write(): 1293 Read() system calls: 16 Write() system calls: 1 Bytes read from storage: 0 Bytes written to storage: 0 Cancelled write bytes: 0 Memory Used: 83664 (max 89344) bytes Number of Outstanding Allocations: 172 (max 187) Number of Pcache Overflow Bytes: 21288 (max 21288) bytes Largest Allocation: 48000 bytes Largest Pcache Allocation: 4360 bytes Lookaside Slots Used: 32 (max 88) Successful lookaside attempts: 216 Lookaside failures due to size: 0 Lookaside failures due to OOM: 0 Pager Heap Usage: 17936 bytes Page cache hits: 4 Page cache misses: 0 Page cache writes: 0 Page cache spills: 0 Schema Heap Usage: 1360 bytes Statement Heap/Lookaside Usage: 2480 bytes Fullscan Steps: 0 Sort Operations: 0 Autoindex Inserts: 0 Virtual Machine Steps: 28 Reprepare operations: 0 Number of times run: 1 Memory used by prepared stmt: 2480 Bytes received by read(): 7527 Bytes sent to write(): 2589 Read() system calls: 18 Write() system calls: 2 Bytes read from storage: 0 Bytes written to storage: 0 Cancelled write bytes: 0 Memory Used: 81208 (max 89344) bytes Number of Outstanding Allocations: 161 (max 187) Number of Pcache Overflow Bytes: 21288 (max 21288) bytes Largest Allocation: 48000 bytes Largest Pcache Allocation: 4360 bytes Lookaside Slots Used: 41 (max 88) Successful lookaside attempts: 238 Lookaside failures due to size: 0 Lookaside failures due to OOM: 0 Pager Heap Usage: 17936 bytes Page cache hits: 2 Page cache misses: 0 Page cache writes: 0 Page cache spills: 0 Schema Heap Usage: 1384 bytes Statement Heap/Lookaside Usage: 3296 bytes Fullscan Steps: 0 Sort Operations: 0 Autoindex Inserts: 0 Virtual Machine Steps: 16 Reprepare operations: 0 Number of times run: 1 Memory used by prepared stmt: 3296 Bytes received by read(): 7624 Bytes sent to write(): 3885 Read() system calls: 20 Write() system calls: 3 Bytes read from storage: 0 Bytes written to storage: 0 Cancelled write bytes: 0 Memory Used: 81208 (max 89344) bytes Number of Outstanding Allocations: 161 (max 187) Number of Pcache Overflow Bytes: 21288 (max 21288) bytes Largest Allocation: 48000 bytes Largest Pcache Allocation: 4360 bytes Lookaside Slots Used: 41 (max 88) Successful lookaside attempts: 260 Lookaside failures due to size: 0 Lookaside failures due to OOM: 0 Pager Heap Usage: 17936 bytes Page cache hits: 2 Page cache misses: 0 Page cache writes: 0 Page cache spills: 0 Schema Heap Usage: 1384 bytes Statement Heap/Lookaside Usage: 3296 bytes Fullscan Steps: 0 Sort Operations: 0 Autoindex Inserts: 0 Virtual Machine Steps: 16 Reprepare operations: 0 Number of times run: 1 Memory used by prepared stmt: 3296 Bytes received by read(): 7721 Bytes sent to write(): 5181 Read() system calls: 22 Write() system calls: 4 Bytes read from storage: 0 Bytes written to storage: 0 Cancelled write bytes: 0 Memory Used: 81208 (max 89344) bytes Number of Outstanding Allocations: 161 (max 187) Number of Pcache Overflow Bytes: 21288 (max 21288) bytes Largest Allocation: 48000 bytes Largest Pcache Allocation: 4360 bytes Lookaside Slots Used: 41 (max 88) Successful lookaside attempts: 282 Lookaside failures due to size: 0 Lookaside failures due to OOM: 0 Pager Heap Usage: 17936 bytes Page cache hits: 2 Page cache misses: 0 Page cache writes: 0 Page cache spills: 0 Schema Heap Usage: 1384 bytes Statement Heap/Lookaside Usage: 3296 bytes Fullscan Steps: 0 Sort Operations: 0 Autoindex Inserts: 0 Virtual Machine Steps: 16 Reprepare operations: 0 Number of times run: 1 Memory used by prepared stmt: 3296 Bytes received by read(): 7818 Bytes sent to write(): 6477 Read() system calls: 24 Write() system calls: 5 Bytes read from storage: 0 Bytes written to storage: 0 Cancelled write bytes: 0 Memory Used: 88616 (max 98408) bytes Number of Outstanding Allocations: 181 (max 193) Number of Pcache Overflow Bytes: 25648 (max 25648) bytes Largest Allocation: 48000 bytes Largest Pcache Allocation: 4360 bytes Lookaside Slots Used: 32 (max 92) Successful lookaside attempts: 362 Lookaside failures due to size: 0 Lookaside failures due to OOM: 0 Pager Heap Usage: 22280 bytes Page cache hits: 5 Page cache misses: 0 Page cache writes: 0 Page cache spills: 0 Schema Heap Usage: 1584 bytes Statement Heap/Lookaside Usage: 2768 bytes Fullscan Steps: 0 Sort Operations: 1 Autoindex Inserts: 0 Virtual Machine Steps: 56 Reprepare operations: 0 Number of times run: 1 Memory used by prepared stmt: 2768 Bytes received by read(): 7915 Bytes sent to write(): 7773 Read() system calls: 26 Write() system calls: 6 Bytes read from storage: 0 Bytes written to storage: 0 Cancelled write bytes: 0 Memory Used: 85776 (max 98408) bytes Number of Outstanding Allocations: 164 (max 193) Number of Pcache Overflow Bytes: 25648 (max 25648) bytes Largest Allocation: 48000 bytes Largest Pcache Allocation: 4360 bytes Lookaside Slots Used: 35 (max 92) Successful lookaside attempts: 367 Lookaside failures due to size: 0 Lookaside failures due to OOM: 0 Pager Heap Usage: 22280 bytes Page cache hits: 0 Page cache misses: 0 Page cache writes: 0 Page cache spills: 0 Schema Heap Usage: 1584 bytes Statement Heap/Lookaside Usage: 2528 bytes Fullscan Steps: 0 Sort Operations: 0 Autoindex Inserts: 0 Virtual Machine Steps: 4 Reprepare operations: 0 Number of times run: 1 Memory used by prepared stmt: 2528 Bytes received by read(): 8012 Bytes sent to write(): 9069 Read() system calls: 28 Write() system calls: 7 Bytes read from storage: 0 Bytes written to storage: 0 Cancelled write bytes: 0 CREATE TABLE "t2"("b","c","_ROWID_",PRIMARY KEY("b","c","_ROWID_"))WITHOUT ROWID; WARNING: writing to an imposter table will corrupt the "t1bc" index! Braun|30|3 Wernher|10|1 von|20|2 Memory Used: 86336 (max 98408) bytes Number of Outstanding Allocations: 174 (max 193) Number of Pcache Overflow Bytes: 25648 (max 25648) bytes Largest Allocation: 48000 bytes Largest Pcache Allocation: 4360 bytes Lookaside Slots Used: 45 (max 97) Successful lookaside attempts: 490 Lookaside failures due to size: 0 Lookaside failures due to OOM: 0 Pager Heap Usage: 22280 bytes Page cache hits: 5 Page cache misses: 0 Page cache writes: 0 Page cache spills: 0 Schema Heap Usage: 2128 bytes Statement Heap/Lookaside Usage: 4752 bytes Fullscan Steps: 2 Sort Operations: 0 Autoindex Inserts: 0 Virtual Machine Steps: 21 Reprepare operations: 0 Number of times run: 1 Memory used by prepared stmt: 4752 Bytes received by read(): 8109 Bytes sent to write(): 10515 Read() system calls: 30 Write() system calls: 9 Bytes read from storage: 0 Bytes written to storage: 0 Cancelled write bytes: 0 Braun|30 Wernher|10 von|20 Memory Used: 86360 (max 98408) bytes Number of Outstanding Allocations: 175 (max 193) Number of Pcache Overflow Bytes: 25648 (max 25648) bytes Largest Allocation: 48000 bytes Largest Pcache Allocation: 4360 bytes Lookaside Slots Used: 45 (max 97) Successful lookaside attempts: 529 Lookaside failures due to size: 0 Lookaside failures due to OOM: 0 Pager Heap Usage: 22280 bytes Page cache hits: 2 Page cache misses: 0 Page cache writes: 0 Page cache spills: 0 Schema Heap Usage: 2152 bytes Statement Heap/Lookaside Usage: 4752 bytes Fullscan Steps: 2 Sort Operations: 0 Autoindex Inserts: 0 Virtual Machine Steps: 19 Reprepare operations: 0 Number of times run: 1 Memory used by prepared stmt: 4752 Bytes received by read(): 8207 Bytes sent to write(): 11845 Read() system calls: 32 Write() system calls: 10 Bytes read from storage: 0 Bytes written to storage: 0 Cancelled write bytes: 0 ``` ## Expectation ```sql Memory Used: 79408 (max 80944) bytes Number of Outstanding Allocations: 172 (max 186) Number of Pcache Overflow Bytes: 16936 (max 16936) bytes Largest Allocation: 48000 bytes Largest Pcache Allocation: 4368 bytes Lookaside Slots Used: 48 (max 97) Successful lookaside attempts: 116 Lookaside failures due to size: 0 Lookaside failures due to OOM: 0 Pager Heap Usage: 13608 bytes Page cache hits: 4 Page cache misses: 0 Page cache writes: 0 Page cache spills: 0 Temporary data spilled to disk: 0 Schema Heap Usage: 856 bytes Statement Heap/Lookaside Usage: 2304 bytes Fullscan Steps: 0 Sort Operations: 0 Autoindex Inserts: 0 Virtual Machine Steps: 30 Reprepare operations: 0 Number of times run: 1 Memory used by prepared stmt: 2304 Bytes received by read(): 7856 Bytes sent to write(): 0 Read() system calls: 14 Write() system calls: 0 Bytes read from storage: 0 Bytes written to storage: 0 Cancelled write bytes: 0 Memory Used: 77112 (max 82744) bytes Number of Outstanding Allocations: 161 (max 186) Number of Pcache Overflow Bytes: 16936 (max 16936) bytes Largest Allocation: 48000 bytes Largest Pcache Allocation: 4368 bytes Lookaside Slots Used: 61 (max 97) Successful lookaside attempts: 154 Lookaside failures due to size: 0 Lookaside failures due to OOM: 0 Pager Heap Usage: 13608 bytes Page cache hits: 2 Page cache misses: 0 Page cache writes: 0 Page cache spills: 0 Temporary data spilled to disk: 0 Schema Heap Usage: 864 bytes Statement Heap/Lookaside Usage: 4880 bytes Fullscan Steps: 0 Sort Operations: 0 Autoindex Inserts: 0 Virtual Machine Steps: 32 Reprepare operations: 0 Number of times run: 1 Memory used by prepared stmt: 4880 Bytes received by read(): 7950 Bytes sent to write(): 1331 Read() system calls: 16 Write() system calls: 1 Bytes read from storage: 0 Bytes written to storage: 0 Cancelled write bytes: 0 Memory Used: 84096 (max 89728) bytes Number of Outstanding Allocations: 182 (max 197) Number of Pcache Overflow Bytes: 21304 (max 21304) bytes Largest Allocation: 48000 bytes Largest Pcache Allocation: 4368 bytes Lookaside Slots Used: 48 (max 97) Successful lookaside attempts: 222 Lookaside failures due to size: 0 Lookaside failures due to OOM: 0 Pager Heap Usage: 17960 bytes Page cache hits: 4 Page cache misses: 0 Page cache writes: 0 Page cache spills: 0 Temporary data spilled to disk: 0 Schema Heap Usage: 1128 bytes Statement Heap/Lookaside Usage: 2352 bytes Fullscan Steps: 0 Sort Operations: 0 Autoindex Inserts: 0 Virtual Machine Steps: 28 Reprepare operations: 0 Number of times run: 1 Memory used by prepared stmt: 2352 Bytes received by read(): 8047 Bytes sent to write(): 2665 Read() system calls: 18 Write() system calls: 2 Bytes read from storage: 0 Bytes written to storage: 0 Cancelled write bytes: 0 Memory Used: 81752 (max 89728) bytes Number of Outstanding Allocations: 171 (max 197) Number of Pcache Overflow Bytes: 21304 (max 21304) bytes Largest Allocation: 48000 bytes Largest Pcache Allocation: 4368 bytes Lookaside Slots Used: 57 (max 97) Successful lookaside attempts: 244 Lookaside failures due to size: 0 Lookaside failures due to OOM: 0 Pager Heap Usage: 17960 bytes Page cache hits: 2 Page cache misses: 0 Page cache writes: 0 Page cache spills: 0 Temporary data spilled to disk: 0 Schema Heap Usage: 1136 bytes Statement Heap/Lookaside Usage: 3296 bytes Fullscan Steps: 0 Sort Operations: 0 Autoindex Inserts: 0 Virtual Machine Steps: 16 Reprepare operations: 0 Number of times run: 1 Memory used by prepared stmt: 3296 Bytes received by read(): 8144 Bytes sent to write(): 4000 Read() system calls: 20 Write() system calls: 3 Bytes read from storage: 0 Bytes written to storage: 0 Cancelled write bytes: 0 Memory Used: 81752 (max 89728) bytes Number of Outstanding Allocations: 171 (max 197) Number of Pcache Overflow Bytes: 21304 (max 21304) bytes Largest Allocation: 48000 bytes Largest Pcache Allocation: 4368 bytes Lookaside Slots Used: 57 (max 97) Successful lookaside attempts: 266 Lookaside failures due to size: 0 Lookaside failures due to OOM: 0 Pager Heap Usage: 17960 bytes Page cache hits: 2 Page cache misses: 0 Page cache writes: 0 Page cache spills: 0 Temporary data spilled to disk: 0 Schema Heap Usage: 1136 bytes Statement Heap/Lookaside Usage: 3296 bytes Fullscan Steps: 0 Sort Operations: 0 Autoindex Inserts: 0 Virtual Machine Steps: 16 Reprepare operations: 0 Number of times run: 1 Memory used by prepared stmt: 3296 Bytes received by read(): 8241 Bytes sent to write(): 5335 Read() system calls: 22 Write() system calls: 4 Bytes read from storage: 0 Bytes written to storage: 0 Cancelled write bytes: 0 Memory Used: 81752 (max 89728) bytes Number of Outstanding Allocations: 171 (max 197) Number of Pcache Overflow Bytes: 21304 (max 21304) bytes Largest Allocation: 48000 bytes Largest Pcache Allocation: 4368 bytes Lookaside Slots Used: 57 (max 97) Successful lookaside attempts: 288 Lookaside failures due to size: 0 Lookaside failures due to OOM: 0 Pager Heap Usage: 17960 bytes Page cache hits: 2 Page cache misses: 0 Page cache writes: 0 Page cache spills: 0 Temporary data spilled to disk: 0 Schema Heap Usage: 1136 bytes Statement Heap/Lookaside Usage: 3296 bytes Fullscan Steps: 0 Sort Operations: 0 Autoindex Inserts: 0 Virtual Machine Steps: 16 Reprepare operations: 0 Number of times run: 1 Memory used by prepared stmt: 3296 Bytes received by read(): 8338 Bytes sent to write(): 6670 Read() system calls: 24 Write() system calls: 5 Bytes read from storage: 0 Bytes written to storage: 0 Cancelled write bytes: 0 Memory Used: 88968 (max 98696) bytes Number of Outstanding Allocations: 189 (max 201) Number of Pcache Overflow Bytes: 25672 (max 25672) bytes Largest Allocation: 48000 bytes Largest Pcache Allocation: 4368 bytes Lookaside Slots Used: 48 (max 101) Successful lookaside attempts: 361 Lookaside failures due to size: 0 Lookaside failures due to OOM: 0 Pager Heap Usage: 22312 bytes Page cache hits: 5 Page cache misses: 0 Page cache writes: 0 Page cache spills: 0 Temporary data spilled to disk: 0 Schema Heap Usage: 1344 bytes Statement Heap/Lookaside Usage: 2576 bytes Fullscan Steps: 0 Sort Operations: 1 Autoindex Inserts: 0 Virtual Machine Steps: 56 Reprepare operations: 0 Number of times run: 1 Memory used by prepared stmt: 2576 Bytes received by read(): 8435 Bytes sent to write(): 8005 Read() system calls: 26 Write() system calls: 6 Bytes read from storage: 0 Bytes written to storage: 0 Cancelled write bytes: 0 Memory Used: 86328 (max 98696) bytes Number of Outstanding Allocations: 174 (max 201) Number of Pcache Overflow Bytes: 25672 (max 25672) bytes Largest Allocation: 48000 bytes Largest Pcache Allocation: 4368 bytes Lookaside Slots Used: 51 (max 101) Successful lookaside attempts: 366 Lookaside failures due to size: 0 Lookaside failures due to OOM: 0 Pager Heap Usage: 22312 bytes Page cache hits: 0 Page cache misses: 0 Page cache writes: 0 Page cache spills: 0 Temporary data spilled to disk: 0 Schema Heap Usage: 1344 bytes Statement Heap/Lookaside Usage: 2528 bytes Fullscan Steps: 0 Sort Operations: 0 Autoindex Inserts: 0 Virtual Machine Steps: 5 Reprepare operations: 0 Number of times run: 1 Memory used by prepared stmt: 2528 Bytes received by read(): 8532 Bytes sent to write(): 9341 Read() system calls: 28 Write() system calls: 7 Bytes read from storage: 0 Bytes written to storage: 0 Cancelled write bytes: 0 CREATE TABLE "t2"("b","c","_ROWID_",PRIMARY KEY("b","c","_ROWID_"))WITHOUT ROWID; Braun|30|3 Wernher|10|1 von|20|2 Memory Used: 86808 (max 98696) bytes Number of Outstanding Allocations: 184 (max 201) Number of Pcache Overflow Bytes: 25672 (max 25672) bytes Largest Allocation: 48000 bytes Largest Pcache Allocation: 4368 bytes Lookaside Slots Used: 58 (max 102) Successful lookaside attempts: 479 Lookaside failures due to size: 0 Lookaside failures due to OOM: 0 Pager Heap Usage: 22312 bytes Page cache hits: 5 Page cache misses: 0 Page cache writes: 0 Page cache spills: 0 Temporary data spilled to disk: 0 Schema Heap Usage: 1824 bytes Statement Heap/Lookaside Usage: 4368 bytes Fullscan Steps: 2 Sort Operations: 0 Autoindex Inserts: 0 Virtual Machine Steps: 21 Reprepare operations: 0 Number of times run: 1 Memory used by prepared stmt: 4368 Bytes received by read(): 8629 Bytes sent to write(): 10758 Read() system calls: 30 Write() system calls: 9 Bytes read from storage: 0 Bytes written to storage: 0 Cancelled write bytes: 0 Braun|30 Wernher|10 von|20 Memory Used: 86816 (max 98696) bytes Number of Outstanding Allocations: 185 (max 201) Number of Pcache Overflow Bytes: 25672 (max 25672) bytes Largest Allocation: 48000 bytes Largest Pcache Allocation: 4368 bytes Lookaside Slots Used: 59 (max 102) Successful lookaside attempts: 516 Lookaside failures due to size: 0 Lookaside failures due to OOM: 0 Pager Heap Usage: 22312 bytes Page cache hits: 2 Page cache misses: 0 Page cache writes: 0 Page cache spills: 0 Temporary data spilled to disk: 0 Schema Heap Usage: 1832 bytes Statement Heap/Lookaside Usage: 4496 bytes Fullscan Steps: 2 Sort Operations: 0 Autoindex Inserts: 0 Virtual Machine Steps: 19 Reprepare operations: 0 Number of times run: 1 Memory used by prepared stmt: 4496 Bytes received by read(): 8727 Bytes sent to write(): 12128 Read() system calls: 32 Write() system calls: 10 Bytes read from storage: 0 Bytes written to storage: 0 Cancelled write bytes: 0 ``` ## Flag ``` ```