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Overview
| Comment: | Re-use deleted rowids for new segments. This has a somewhat surprising impact on performance, I believe because it keeps the index smaller (by keeping rowids smaller), and also because it improves locality in the table (deleting a row means we've already touched the pages leading to that rowid). (CVS 3405) |
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| Downloads: | Tarball | ZIP archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
2f5f6290c9ef99c7b060aecc4d996c97 |
| User & Date: | shess 2006-09-11 21:39:22.000 |
Context
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2006-09-11
| ||
| 23:45 | Add support for IF EXISTS on CREATE/DROP TRIGGER/VIEW. Ticket #1899. (CVS 3406) (check-in: e4fe736cfb user: drh tags: trunk) | |
| 21:39 | Re-use deleted rowids for new segments. This has a somewhat surprising impact on performance, I believe because it keeps the index smaller (by keeping rowids smaller), and also because it improves locality in the table (deleting a row means we've already touched the pages leading to that rowid). (CVS 3405) (check-in: 2f5f6290c9 user: shess tags: trunk) | |
| 11:13 | Get VACUUM working with virtual tables. (CVS 3404) (check-in: d5ffef3870 user: drh tags: trunk) | |
Changes
Changes to ext/fts1/fts1.c.
| ︙ | ︙ | |||
792 793 794 795 796 797 798 | /* CONTENT_DELETE */ "delete from %_content where rowid = ?", /* TERM_SELECT */ "select rowid, doclist from %_term where term = ? and segment = ?", /* TERM_SELECT_ALL */ "select doclist from %_term where term = ? order by segment", /* TERM_INSERT */ | | | 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 |
/* CONTENT_DELETE */ "delete from %_content where rowid = ?",
/* TERM_SELECT */
"select rowid, doclist from %_term where term = ? and segment = ?",
/* TERM_SELECT_ALL */
"select doclist from %_term where term = ? order by segment",
/* TERM_INSERT */
"insert into %_term (rowid, term, segment, doclist) values (?, ?, ?, ?)",
/* TERM_UPDATE */ "update %_term set doclist = ? where rowid = ?",
/* TERM_DELETE */ "delete from %_term where rowid = ?",
};
typedef struct fulltext_vtab {
sqlite3_vtab base;
sqlite3 *db;
|
| ︙ | ︙ | |||
1032 1033 1034 1035 1036 1037 1038 |
return rc;
}
*out = doclist;
return SQLITE_OK;
}
| | | > > > > > | > > | > > > > > > | | | 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 |
return rc;
}
*out = doclist;
return SQLITE_OK;
}
/* insert into %_term (rowid, term, segment, doclist)
values ([piRowid], [pTerm], [iSegment], [doclist])
** Lets sqlite select rowid if piRowid is NULL, else uses *piRowid.
**
** NOTE(shess) piRowid is IN, with values of "space of int64" plus
** null, it is not used to pass data back to the caller.
*/
static int term_insert(fulltext_vtab *v, sqlite_int64 *piRowid,
const char *pTerm, int nTerm,
int iSegment, DocList *doclist){
sqlite3_stmt *s;
int rc = sql_get_statement(v, TERM_INSERT_STMT, &s);
if( rc!=SQLITE_OK ) return rc;
if( piRowid==NULL ){
rc = sqlite3_bind_null(s, 1);
}else{
rc = sqlite3_bind_int64(s, 1, *piRowid);
}
if( rc!=SQLITE_OK ) return rc;
rc = sqlite3_bind_text(s, 2, pTerm, nTerm, SQLITE_STATIC);
if( rc!=SQLITE_OK ) return rc;
rc = sqlite3_bind_int(s, 3, iSegment);
if( rc!=SQLITE_OK ) return rc;
rc = sqlite3_bind_blob(s, 4, doclist->pData, doclist->nData, SQLITE_STATIC);
if( rc!=SQLITE_OK ) return rc;
return sql_single_step_statement(v, TERM_INSERT_STMT, &s);
}
/* update %_term set doclist = [doclist] where rowid = [rowid] */
static int term_update(fulltext_vtab *v, sqlite_int64 rowid,
|
| ︙ | ︙ | |||
1927 1928 1929 1930 1931 1932 1933 |
int iSegment = 0, rc;
rc = term_select(v, pTerm, nTerm, iSegment, &iIndexRow, &doclist);
if( rc==SQLITE_DONE ){
docListInit(&doclist, DL_POSITIONS_OFFSETS, 0, 0);
docListUpdate(&doclist, d);
/* TODO(shess) Consider length(doclist)>CHUNK_MAX? */
| | | 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 |
int iSegment = 0, rc;
rc = term_select(v, pTerm, nTerm, iSegment, &iIndexRow, &doclist);
if( rc==SQLITE_DONE ){
docListInit(&doclist, DL_POSITIONS_OFFSETS, 0, 0);
docListUpdate(&doclist, d);
/* TODO(shess) Consider length(doclist)>CHUNK_MAX? */
rc = term_insert(v, NULL, pTerm, nTerm, iSegment, &doclist);
goto err;
}
if( rc!=SQLITE_ROW ) return SQLITE_ERROR;
docListUpdate(&doclist, d);
if( doclist.nData<=CHUNK_MAX ){
rc = term_update(v, iIndexRow, &doclist);
|
| ︙ | ︙ | |||
1949 1950 1951 1952 1953 1954 1955 | if( rc!=SQLITE_OK ) goto err; /* Try to insert the doclist into a higher segment bucket. On ** failure, accumulate existing doclist with the doclist from that ** bucket, and put results in the next bucket. */ iSegment++; | > | > | | > > > | 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 |
if( rc!=SQLITE_OK ) goto err;
/* Try to insert the doclist into a higher segment bucket. On
** failure, accumulate existing doclist with the doclist from that
** bucket, and put results in the next bucket.
*/
iSegment++;
while( (rc=term_insert(v, &iIndexRow, pTerm, nTerm, iSegment,
&doclist))!=SQLITE_OK ){
sqlite_int64 iSegmentRow;
DocList old;
int rc2;
/* Retain old error in case the term_insert() error was really an
** error rather than a bounced insert.
*/
rc2 = term_select(v, pTerm, nTerm, iSegment, &iSegmentRow, &old);
if( rc2!=SQLITE_ROW ) goto err;
rc = term_delete(v, iSegmentRow);
if( rc!=SQLITE_OK ) goto err;
/* Reusing lowest-number deleted row keeps the index smaller. */
if( iSegmentRow<iIndexRow ) iIndexRow = iSegmentRow;
/* doclist contains the newer data, so accumulate it over old.
** Then steal accumulated data for doclist.
*/
docListAccumulate(&old, &doclist);
docListDestroy(&doclist);
doclist = old;
|
| ︙ | ︙ |