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Overview
Comment:Expand on the comment above OP_Destroy to explain why it throws an error if there are any active reader VMs.
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SHA3-256: b9a8c2b9bec9f537b2d5aff6659a5748b1f70b53519a1f9dfceb5209154eca8e
User & Date: dan 2017-04-08 14:11:47
Context
2017-04-08
18:18
Disallow leading zeros on numeric constants in JSON. Fix for ticket [b93be8729a895a528e2] check-in: 204e72f0 user: drh tags: trunk
14:11
Expand on the comment above OP_Destroy to explain why it throws an error if there are any active reader VMs. check-in: b9a8c2b9 user: dan tags: trunk
13:52
Have the rtree module close any open blob-handle within the xSavepoint method. This prevents such an open blob handle from interfering with DROP TABLE operations. check-in: fa4416ad user: dan tags: trunk
Changes
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Changes to src/vdbe.c.

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** P3==1 then the table to be clear is in the auxiliary database file
** that is used to store tables create using CREATE TEMPORARY TABLE.
**
** If AUTOVACUUM is enabled then it is possible that another root page
** might be moved into the newly deleted root page in order to keep all
** root pages contiguous at the beginning of the database.  The former
** value of the root page that moved - its value before the move occurred -
** is stored in register P2.  If no page 
** movement was required (because the table being dropped was already 
** the last one in the database) then a zero is stored in register P2.
** If AUTOVACUUM is disabled then a zero is stored in register P2.







**
** See also: Clear
*/
case OP_Destroy: {     /* out2 */
  int iMoved;
  int iDb;








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** P3==1 then the table to be clear is in the auxiliary database file
** that is used to store tables create using CREATE TEMPORARY TABLE.
**
** If AUTOVACUUM is enabled then it is possible that another root page
** might be moved into the newly deleted root page in order to keep all
** root pages contiguous at the beginning of the database.  The former
** value of the root page that moved - its value before the move occurred -
** is stored in register P2. If no page movement was required (because the
** table being dropped was already the last one in the database) then a 
** zero is stored in register P2.  If AUTOVACUUM is disabled then a zero 
** is stored in register P2.
**
** This opcode throws an error if there are any active reader VMs when
** it is invoked. This is done to avoid the difficulty associated with 
** updating existing cursors when a root page is moved in an AUTOVACUUM 
** database. This error is thrown even if the database is not an AUTOVACUUM 
** db in order to avoid introducing an incompatibility between autovacuum 
** and non-autovacuum modes.
**
** See also: Clear
*/
case OP_Destroy: {     /* out2 */
  int iMoved;
  int iDb;