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Performance optimization in sqlite3BtreeCursor().

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FossilOrigin-Name: ea068b099c96b8b9526114732d2a6be186cf381b7329d102778ad25b95510c9e
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drh 2019-10-25 14:46:05 +00:00
parent ef2df8f343
commit db561bceda
3 changed files with 31 additions and 18 deletions
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14
manifest
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@ -1,5 +1,5 @@
C In\sfts5,\sfix\sa\scase\sof\soverreading\sa\sbuffer\sby\s1\sbyte\swhen\scounting\scharacters\sin\smalformed\sutf-8.\sFix\sfor\s[dd1f67bf].
D 2019-10-24T20:35:27.749
C Performance\soptimization\sin\ssqlite3BtreeCursor().
D 2019-10-25T14:46:05.015
F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@ -467,7 +467,7 @@ F src/auth.c a3d5bfdba83d25abed1013a8c7a5f204e2e29b0c25242a56bc02bb0c07bf1e06
F src/backup.c f70077d40c08b7787bfe934e4d1da8030cb0cc57d46b345fba2294b7d1be23ab
F src/bitvec.c 17ea48eff8ba979f1f5b04cc484c7bb2be632f33
F src/btmutex.c 8acc2f464ee76324bf13310df5692a262b801808984c1b79defb2503bbafadb6
F src/btree.c a8a9c2ce62bdf54c8cf9795143d7cb10b7473a1230a0572f702d061ffcceefe5
F src/btree.c 12e251f8c3eaad05e6d0db94772bf779b3a644e18d884025da6bcbc98cad1d22
F src/btree.h f27a33c49280209a93385e218306c4ee5f46ba8d7649d2f81a7166b282232484
F src/btreeInt.h 91806f01fd1145a9a86ba3042f25c38d8faf6002701bf5e780742cf88bcff437
F src/build.c 0e558ef847ccc4b6aa38dee44cde9d9df46e953b0a66e4fa4376265824955fe3
@ -1848,7 +1848,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
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2
manifest.uuid
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@ -1 +1 @@
8d964e1c21d4cea699023e02b0616a75c5859dd083c9365cdcbc0676ebbdaae4
ea068b099c96b8b9526114732d2a6be186cf381b7329d102778ad25b95510c9e

33
src/btree.c
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@ -4379,9 +4379,13 @@ static int btreeCursor(
allocateTempSpace(pBt);
if( pBt->pTmpSpace==0 ) return SQLITE_NOMEM_BKPT;
}
if( iTable==1 && btreePagecount(pBt)==0 ){
assert( wrFlag==0 );
iTable = 0;
if( iTable<=1 ){
if( iTable<1 ){
return SQLITE_CORRUPT_BKPT;
}else if( btreePagecount(pBt)==0 ){
assert( wrFlag==0 );
iTable = 0;
}
}
/* Now that no other errors can occur, finish filling in the BtCursor
@ -4406,6 +4410,19 @@ static int btreeCursor(
pCur->eState = CURSOR_INVALID;
return SQLITE_OK;
}
static int btreeCursorWithLock(
Btree *p, /* The btree */
int iTable, /* Root page of table to open */
int wrFlag, /* 1 to write. 0 read-only */
struct KeyInfo *pKeyInfo, /* First arg to comparison function */
BtCursor *pCur /* Space for new cursor */
){
int rc;
sqlite3BtreeEnter(p);
rc = btreeCursor(p, iTable, wrFlag, pKeyInfo, pCur);
sqlite3BtreeLeave(p);
return rc;
}
int sqlite3BtreeCursor(
Btree *p, /* The btree */
int iTable, /* Root page of table to open */
@ -4413,15 +4430,11 @@ int sqlite3BtreeCursor(
struct KeyInfo *pKeyInfo, /* First arg to xCompare() */
BtCursor *pCur /* Write new cursor here */
){
int rc;
if( iTable<1 ){
rc = SQLITE_CORRUPT_BKPT;
if( p->sharable ){
return btreeCursorWithLock(p, iTable, wrFlag, pKeyInfo, pCur);
}else{
sqlite3BtreeEnter(p);
rc = btreeCursor(p, iTable, wrFlag, pKeyInfo, pCur);
sqlite3BtreeLeave(p);
return btreeCursor(p, iTable, wrFlag, pKeyInfo, pCur);
}
return rc;
}
/*