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SQLite training in Houston TX on 2019-11-05 (details)
Part of the 2019 Tcl Conference

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Overview
Comment:Instead of just the flags byte, include the first 8 bytes of the relevant page in an on-commit conflict log message.
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SHA3-256: 52e443eb5523963a6b09be66ab1c7281930d0155bf3df13eee0ec9066dbc7f0b
User & Date: dan 2018-05-15 11:33:42
Context
2018-05-15
11:55
Merge latest trunk changes into this branch. check-in: 72f39efa user: dan tags: begin-concurrent-pnu
11:33
Instead of just the flags byte, include the first 8 bytes of the relevant page in an on-commit conflict log message. check-in: 52e443eb user: dan tags: begin-concurrent-pnu
11:28
Instead of just the flags byte, include the first 8 bytes of the relevant page in an on-commit conflict log message. check-in: e7dc03e7 user: dan tags: begin-concurrent
09:03
Include the value of the "flags" byte of the relevant page in the log message emitted when a BEGIN CONCURRENT commit conflict is detected. check-in: de19abb9 user: dan tags: begin-concurrent-pnu
Changes
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Changes to src/btree.c. 

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#ifdef SQLITE_OMIT_CONCURRENT
  assert( pgno==0 );
#else
  if( rc==SQLITE_BUSY_SNAPSHOT && pgno ){
    PgHdr *pPg = 0;
    int rc2 = sqlite3PagerGet(pBt->pPager, pgno, &pPg, 0);
    if( rc2==SQLITE_OK ){
      u8 pageFlags = 0;
      int bWrite = -1;
      const char *zObj = 0;
      const char *zTab = 0;


      if( pPg ){
        Pgno pgnoRoot = 0;
        HashElem *pE;
        Schema *pSchema;












        pgnoRoot = ((MemPage*)sqlite3PagerGetExtra(pPg))->pgnoRoot;
        bWrite = sqlite3PagerIswriteable(pPg);
        pageFlags = ((u8*)sqlite3PagerGetData(pPg))[0];
        sqlite3PagerUnref(pPg);

        pSchema = sqlite3SchemaGet(p->db, p);
        if( pSchema ){
          for(pE=sqliteHashFirst(&pSchema->tblHash); pE; pE=sqliteHashNext(pE)){
            Table *pTab = (Table *)sqliteHashData(pE);
            if( pTab->tnum==(int)pgnoRoot ){
................................................................................
          }
        }
      }

      sqlite3_log(SQLITE_OK,
          "cannot commit CONCURRENT transaction "
          "- conflict at page %d "
          "(%s page; part of db %s %s%s%s; flags=0x%02x)",
          (int)pgno,
          (bWrite==0?"read-only":(bWrite>0?"read/write":"unknown")),
          (zTab ? "index" : "table"),
          (zTab ? zTab : ""), (zTab ? "." : ""), (zObj ? zObj : "UNKNOWN"),
          pageFlags
      );
    }
  }
#endif
  sqlite3BtreeLeave(p);
  return rc;
}








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#ifdef SQLITE_OMIT_CONCURRENT
  assert( pgno==0 );
#else
  if( rc==SQLITE_BUSY_SNAPSHOT && pgno ){
    PgHdr *pPg = 0;
    int rc2 = sqlite3PagerGet(pBt->pPager, pgno, &pPg, 0);
    if( rc2==SQLITE_OK ){

      int bWrite = -1;
      const char *zObj = 0;
      const char *zTab = 0;
      char zContent[17];

      if( pPg ){
        Pgno pgnoRoot = 0;
        HashElem *pE;
        Schema *pSchema;
        u8 *aData = (u8*)sqlite3PagerGetData(pPg);
        int i;
        for(i=0; i<8; i++){
          static const char hexdigits[] = {
            '0', '1', '2', '3', '4', '5', '6', '7',
            '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' 
          };
          zContent[i*2] = hexdigits[(aData[i] >> 4)];
          zContent[i*2+1] = hexdigits[(aData[i] & 0xF)];
        }
        zContent[16] = '\0';

        pgnoRoot = ((MemPage*)sqlite3PagerGetExtra(pPg))->pgnoRoot;
        bWrite = sqlite3PagerIswriteable(pPg);

        sqlite3PagerUnref(pPg);

        pSchema = sqlite3SchemaGet(p->db, p);
        if( pSchema ){
          for(pE=sqliteHashFirst(&pSchema->tblHash); pE; pE=sqliteHashNext(pE)){
            Table *pTab = (Table *)sqliteHashData(pE);
            if( pTab->tnum==(int)pgnoRoot ){
................................................................................
          }
        }
      }

      sqlite3_log(SQLITE_OK,
          "cannot commit CONCURRENT transaction "
          "- conflict at page %d "
          "(%s page; part of db %s %s%s%s; content=%s...)",
          (int)pgno,
          (bWrite==0?"read-only":(bWrite>0?"read/write":"unknown")),
          (zTab ? "index" : "table"),
          (zTab ? zTab : ""), (zTab ? "." : ""), (zObj ? zObj : "UNKNOWN"),
          zContent
      );
    }
  }
#endif
  sqlite3BtreeLeave(p);
  return rc;
}

Changes to test/concurrent5.test. 

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  db eval {
    INSERT INTO t1 VALUES(randomblob(200), randomblob(200));
  }

  catchsql COMMIT db2
} {1 {database is locked}}
do_test_conflict_msg 1.1.2 {
  conflict at page 2 (read-only page; part of db table t1; flags=0x05)
}

do_test 1.2.1 {
  set ::log [list]
  db2 eval {
    ROLLBACK;
    BEGIN CONCURRENT;
................................................................................
    INSERT INTO t1 VALUES(12, 11);
  }

  catchsql COMMIT db2
} {1 {database is locked}}

do_test_conflict_msg 1.2.2 {
  conflict at page 105 (read/write page; part of db table t1; flags=0x0d)
}

do_test 1.3.1 {
  set ::log [list]
  db2 eval {
    ROLLBACK;
    BEGIN CONCURRENT;
................................................................................
    INSERT INTO t2 VALUES('y');
  }

  catchsql COMMIT db2
} {1 {database is locked}}

do_test_conflict_msg 1.3.2 {
  conflict at page 3 (read/write page; part of db table t2; flags=0x0d)
}

do_test 1.4.1 {
  set ::log [list]

  execsql {
    ROLLBACK;
................................................................................
  } db2

  execsql { INSERT INTO t3 VALUES(NULL, 5002) } db
  catchsql COMMIT db2
} {1 {database is locked}}

do_test_conflict_msg 1.3.2 {
  conflict at page 211 (read/write page; part of db index t3.i3; flags=0x0a)
}

db close
db2 close
sqlite3_shutdown
test_sqlite3_log 
sqlite3_initialize
finish_test









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  db eval {
    INSERT INTO t1 VALUES(randomblob(200), randomblob(200));
  }

  catchsql COMMIT db2
} {1 {database is locked}}
do_test_conflict_msg 1.1.2 {
  conflict at page 2 (read-only page; part of db table t1; content=0500000063021100...)
}

do_test 1.2.1 {
  set ::log [list]
  db2 eval {
    ROLLBACK;
    BEGIN CONCURRENT;
................................................................................
    INSERT INTO t1 VALUES(12, 11);
  }

  catchsql COMMIT db2
} {1 {database is locked}}

do_test_conflict_msg 1.2.2 {
  conflict at page 105 (read/write page; part of db table t1; content=0D00000002026100...)
}

do_test 1.3.1 {
  set ::log [list]
  db2 eval {
    ROLLBACK;
    BEGIN CONCURRENT;
................................................................................
    INSERT INTO t2 VALUES('y');
  }

  catchsql COMMIT db2
} {1 {database is locked}}

do_test_conflict_msg 1.3.2 {
  conflict at page 3 (read/write page; part of db table t2; content=0D0000000103FB00...)
}

do_test 1.4.1 {
  set ::log [list]

  execsql {
    ROLLBACK;
................................................................................
  } db2

  execsql { INSERT INTO t3 VALUES(NULL, 5002) } db
  catchsql COMMIT db2
} {1 {database is locked}}

do_test_conflict_msg 1.3.2 {
  conflict at page 211 (read/write page; part of db index t3.i3; content=0A0310006300D800...)
}

db close
db2 close
sqlite3_shutdown
test_sqlite3_log 
sqlite3_initialize
finish_test

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