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Overview
| Comment: | Avoid generating OP_TableLock unnecessary instructions on btrees that are not sharable. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
8cb8516d2009d52d35a22263e4c892f1 |
| User & Date: | drh 2016-11-08 17:19:22 |
References
|
2017-01-09
| ||
| 06:53 | Disable the optimization from [8cb8516d] (omit TableLock instructions for non-sharable databases) on this branch. This branch uses the TableLock instructions to ensure that the db schema is not written from within a BEGIN CONCURRENT transaction. check-in: c8ca3e0a user: dan tags: begin-concurrent | |
Context
|
2016-11-08
| ||
| 19:22 | Avoid superfluous cursor seeks in "INSERT OR REPLACE" statements. check-in: bec5b6d4 user: dan tags: trunk | |
| 17:19 | Avoid generating OP_TableLock unnecessary instructions on btrees that are not sharable. check-in: 8cb8516d user: drh tags: trunk | |
| 16:27 | Fix the speedtest1.c test program so that it gives closing "%" wildcards on LIKE searches. check-in: c2f84f63 user: drh tags: trunk | |
Changes
Changes to src/build.c.
55 56 57 58 59 60 61 62 63 64 65 66 67 68 |
){
Parse *pToplevel = sqlite3ParseToplevel(pParse);
int i;
int nBytes;
TableLock *p;
assert( iDb>=0 );
for(i=0; i<pToplevel->nTableLock; i++){
p = &pToplevel->aTableLock[i];
if( p->iDb==iDb && p->iTab==iTab ){
p->isWriteLock = (p->isWriteLock || isWriteLock);
return;
}
}
|
> > |
55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 |
){
Parse *pToplevel = sqlite3ParseToplevel(pParse);
int i;
int nBytes;
TableLock *p;
assert( iDb>=0 );
if( iDb==1 ) return;
if( !sqlite3BtreeSharable(pParse->db->aDb[iDb].pBt) ) return;
for(i=0; i<pToplevel->nTableLock; i++){
p = &pToplevel->aTableLock[i];
if( p->iDb==iDb && p->iTab==iTab ){
p->isWriteLock = (p->isWriteLock || isWriteLock);
return;
}
}
|