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Merge the performance enhancements of trunk (and some obscure bug fixes)

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into the sessions branch.

FossilOrigin-Name: 7f51ad97f0b24c57453d58faf25eee68861faa23
This commit is contained in:
drh
2014-03-04 14:34:14 +00:00
parent 15d4211400 5f1d536b53
commit 7826a9b83f
68 changed files with 3223 additions and 1426 deletions
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5
src/vdbeblob.c
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@@ -135,14 +135,13 @@ int sqlite3_blob_open(
** which closes the b-tree cursor and (possibly) commits the
** transaction.
*/
static const int iLn = __LINE__+4;
static const VdbeOpList openBlob[] = {
/* {OP_Transaction, 0, 0, 0}, // 0: Inserted separately */
{OP_TableLock, 0, 0, 0}, /* 1: Acquire a read or write lock */
/* One of the following two instructions is replaced by an OP_Noop. */
{OP_OpenRead, 0, 0, 0}, /* 2: Open cursor 0 for reading */
{OP_OpenWrite, 0, 0, 0}, /* 3: Open cursor 0 for read/write */
{OP_Variable, 1, 1, 1}, /* 4: Push the rowid to the stack */
{OP_NotExists, 0, 10, 1}, /* 5: Seek the cursor */
{OP_Column, 0, 0, 1}, /* 6 */
@@ -269,7 +268,7 @@ int sqlite3_blob_open(
pTab->pSchema->schema_cookie,
pTab->pSchema->iGeneration);
sqlite3VdbeChangeP5(v, 1);
sqlite3VdbeAddOpList(v, sizeof(openBlob)/sizeof(VdbeOpList), openBlob);
sqlite3VdbeAddOpList(v, ArraySize(openBlob), openBlob, iLn);
/* Make sure a mutex is held on the table to be accessed */
sqlite3VdbeUsesBtree(v, iDb);